diff --git a/homeassistant/components/overkiz/climate/atlantic_electrical_heater_with_adjustable_temperature_setpoint.py b/homeassistant/components/overkiz/climate/atlantic_electrical_heater_with_adjustable_temperature_setpoint.py
index 8b813372fd35..faccd8e10dda 100644
--- a/homeassistant/components/overkiz/climate/atlantic_electrical_heater_with_adjustable_temperature_setpoint.py
+++ b/homeassistant/components/overkiz/climate/atlantic_electrical_heater_with_adjustable_temperature_setpoint.py
@@ -167,7 +167,13 @@ class AtlanticElectricalHeaterWithAdjustableTemperatureSetpoint(
     @override
     def target_temperature(self) -> float | None:
         """Return the temperature."""
-        if state := self.device.states.get(OverkizState.CORE_TARGET_TEMPERATURE):
+        # core:TargetTemperatureState stays pinned to comfort in auto mode.
+        state_name = (
+            OverkizState.IO_EFFECTIVE_TEMPERATURE_SETPOINT
+            if self.hvac_mode == HVACMode.AUTO
+            else OverkizState.CORE_TARGET_TEMPERATURE
+        )
+        if state := self.device.states.get(state_name):
             return state.value_as_float
         return None
 
@@ -187,6 +193,10 @@ class AtlanticElectricalHeaterWithAdjustableTemperatureSetpoint(
     async def async_set_temperature(self, **kwargs: Any) -> None:
         """Set new temperature."""
         temperature = kwargs[ATTR_TEMPERATURE]
-        await self.executor.async_execute_command(
-            OverkizCommand.SET_TARGET_TEMPERATURE, temperature
+        # setTargetTemperature would overwrite comfort instead of the preset.
+        command = (
+            OverkizCommand.SET_DEROGATED_TARGET_TEMPERATURE
+            if self.hvac_mode == HVACMode.AUTO
+            else OverkizCommand.SET_TARGET_TEMPERATURE
         )
+        await self.executor.async_execute_command(command, temperature)
diff --git a/tests/components/overkiz/fixtures/setup/cloud_atlantic_cozytouch.json b/tests/components/overkiz/fixtures/setup/cloud_atlantic_cozytouch.json
index 1b530de81464..7f47e2773e1d 100644
--- a/tests/components/overkiz/fixtures/setup/cloud_atlantic_cozytouch.json
+++ b/tests/components/overkiz/fixtures/setup/cloud_atlantic_cozytouch.json
@@ -3905,6 +3905,1372 @@
       "type": 1,
       "oid": "260c6316-213c-45ee-9c38-46850a698bf2",
       "uiClass": "HeatingSystem"
+    },
+    {
+      "creationTime": 1602324374000,
+      "lastUpdateTime": 1602324374000,
+      "label": "Living Room Heater",
+      "deviceURL": "io://1234-5678-5643/11009627#1",
+      "shortcut": false,
+      "controllableName": "io:AtlanticElectricalHeaterWithAdjustableTemperatureSetpointIOComponent",
+      "definition": {
+        "commands": [
+          {
+            "commandName": "addLockLevel",
+            "nparams": 2
+          },
+          {
+            "commandName": "advancedRefresh",
+            "nparams": 2
+          },
+          {
+            "commandName": "cancelHeatingLevel",
+            "nparams": 1
+          },
+          {
+            "commandName": "delayedStopIdentify",
+            "nparams": 1
+          },
+          {
+            "commandName": "getName",
+            "nparams": 0
+          },
+          {
+            "commandName": "identify",
+            "nparams": 0
+          },
+          {
+            "commandName": "noPersonInside",
+            "nparams": 0
+          },
+          {
+            "commandName": "off",
+            "nparams": 0
+          },
+          {
+            "commandName": "personInside",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshComfortTemperature",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshDateTime",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshDerogatedTargetTemperature",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshEcoTemperature",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshHeatingLevel",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshIdentifier",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshManufacturerName",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshMaximumHeatingTargetTemperature",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshMaximumTargetTemperature",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshOperatingMode",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshTargetTemperature",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshTemperature",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshTimeProgram",
+            "nparams": 0
+          },
+          {
+            "commandName": "removeLockLevel",
+            "nparams": 1
+          },
+          {
+            "commandName": "resetLockLevels",
+            "nparams": 0
+          },
+          {
+            "commandName": "setComfortTemperature",
+            "nparams": 1
+          },
+          {
+            "commandName": "setDateTime",
+            "nparams": 1
+          },
+          {
+            "commandName": "setDerogatedTargetTemperature",
+            "nparams": 1
+          },
+          {
+            "commandName": "setEcoTemperature",
+            "nparams": 1
+          },
+          {
+            "commandName": "setHeatingLevel",
+            "nparams": 1
+          },
+          {
+            "commandName": "setHeatingLevelWithTimer",
+            "nparams": 2
+          },
+          {
+            "commandName": "setHolidays",
+            "nparams": 1
+          },
+          {
+            "commandName": "setHolidaysTargetTemperature",
+            "nparams": 1
+          },
+          {
+            "commandName": "setName",
+            "nparams": 1
+          },
+          {
+            "commandName": "setOccupancyActivation",
+            "nparams": 1
+          },
+          {
+            "commandName": "setOccupancy",
+            "nparams": 1
+          },
+          {
+            "commandName": "setOpenWindowDetectionActivation",
+            "nparams": 1
+          },
+          {
+            "commandName": "setOperatingMode",
+            "nparams": 1
+          },
+          {
+            "commandName": "setPreviousTargetTemperature",
+            "nparams": 1
+          },
+          {
+            "commandName": "setSchedulingType",
+            "nparams": 1
+          },
+          {
+            "commandName": "setTargetTemperature",
+            "nparams": 1
+          },
+          {
+            "commandName": "setTimeProgram",
+            "nparams": 1
+          },
+          {
+            "commandName": "startIdentify",
+            "nparams": 0
+          },
+          {
+            "commandName": "stopIdentify",
+            "nparams": 0
+          },
+          {
+            "commandName": "wink",
+            "nparams": 1
+          },
+          {
+            "commandName": "pairOneWayController",
+            "nparams": 2
+          },
+          {
+            "commandName": "refreshAutoProgram",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshControllerAddress",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshCumulatedLowering",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshCurrentWorkingRate",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshDeletionCancelation",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshEffectiveTemperatureSetpoint",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshLocalLeadTime",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshModel",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshNativeFunctionalLevel",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshPeakNotice",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshPeakWarning",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshPowerAndTension",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshRoomDeletionThreshold",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshSetpointLoweringTemperatureInProgMode",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshSynchronisationRequest",
+            "nparams": 0
+          },
+          {
+            "commandName": "refreshTemperatureProbeCalibrationOffset",
+            "nparams": 0
+          },
+          {
+            "commandName": "setCommunicationTest",
+            "nparams": 1
+          },
+          {
+            "commandName": "setDeletionCancelation",
+            "nparams": 1
+          },
+          {
+            "commandName": "setExpectedPresence",
+            "nparams": 1
+          },
+          {
+            "commandName": "setHeatingLevelForTrigger",
+            "nparams": 1
+          },
+          {
+            "commandName": "setNativeLevelsList",
+            "nparams": 1
+          },
+          {
+            "commandName": "setPeakNotice",
+            "nparams": 1
+          },
+          {
+            "commandName": "setPeakWarning",
+            "nparams": 1
+          },
+          {
+            "commandName": "setRoomDeletionThreshold",
+            "nparams": 1
+          },
+          {
+            "commandName": "setSetpointLoweringTemperatureInProgMode",
+            "nparams": 1
+          },
+          {
+            "commandName": "setTemperatureProbeCalibrationOffset",
+            "nparams": 1
+          },
+          {
+            "commandName": "setTwinningExit",
+            "nparams": 1
+          },
+          {
+            "commandName": "unpairAllOneWayControllers",
+            "nparams": 0
+          },
+          {
+            "commandName": "unpairOneWayController",
+            "nparams": 2
+          }
+        ],
+        "states": [
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:ComfortRoomTemperatureState"
+          },
+          {
+            "eventBased": true,
+            "type": "DataState",
+            "qualifiedName": "core:CommandLockLevelsState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "core:DateTimeState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:DerogatedTargetTemperatureState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["good", "low", "normal", "verylow"],
+            "qualifiedName": "core:DiscreteRSSILevelState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:EcoRoomTemperatureState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["off", "on"],
+            "qualifiedName": "core:HolidaysModeState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:HolidaysTargetTemperatureState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "core:IdentifierState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "core:ManufacturerNameState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:MaximumHeatingTargetTemperatureState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:MaximumTargetTemperatureState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "core:NameState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["active", "inactive"],
+            "qualifiedName": "core:OccupancyActivationState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["off", "on"],
+            "qualifiedName": "core:OnOffState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["active", "inactive"],
+            "qualifiedName": "core:OpenWindowDetectionActivationState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": [
+              "antifreeze",
+              "auto",
+              "away",
+              "eco",
+              "frostprotection",
+              "manual",
+              "max",
+              "normal",
+              "off",
+              "on",
+              "prog",
+              "program",
+              "boost"
+            ],
+            "qualifiedName": "core:OperatingModeState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:PreviousTargetTemperatureState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:PriorityLockTimerState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:RSSILevelState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["increase", "none", "standby"],
+            "qualifiedName": "core:RegulationModeState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["available", "unavailable"],
+            "qualifiedName": "core:StatusState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:TargetTemperatureState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "core:TimeProgramState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:VersionState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "io:AutoProgramState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "io:ControllerAddressState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "io:CumulatedLoweringState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "io:CurrentWorkingRateState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["deletion cancelation", "no deletion cancelation"],
+            "qualifiedName": "io:DeletionCancelationState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "io:EffectiveTemperatureSetpointState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "io:ExpectedPresenceState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["external", "internal"],
+            "qualifiedName": "io:InternalExternalSchedulingTypeState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "io:LocalLeadTimeState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": [
+              "boost",
+              "comfort",
+              "comfort-1",
+              "comfort-2",
+              "eco",
+              "frostprotection",
+              "off",
+              "secured"
+            ],
+            "qualifiedName": "io:MaximumHeatingLevelState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "io:ModelState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["base", "medium", "top"],
+            "qualifiedName": "io:NativeFunctionalLevelState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["long peak", "no peak", "short peak"],
+            "qualifiedName": "io:PeakNoticeState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["long peak warning", "no warning", "short peak warning"],
+            "qualifiedName": "io:PeakWarningState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "io:PowerState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": [
+              "comfortLevel1",
+              "comfortLevel2",
+              "comfortLevel3",
+              "comfortLevel4",
+              "environmentProtection",
+              "humanProtection",
+              "userLevel1",
+              "userLevel2"
+            ],
+            "qualifiedName": "io:PriorityLockLevelState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": [
+              "LSC",
+              "SAAC",
+              "SFC",
+              "UPS",
+              "externalGateway",
+              "localUser",
+              "myself",
+              "rain",
+              "security",
+              "temperature",
+              "timer",
+              "user",
+              "wind"
+            ],
+            "qualifiedName": "io:PriorityLockOriginatorState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "io:RoomDeletionThresholdState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": ["kept", "lost"],
+            "qualifiedName": "io:RunningState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "io:SetpointLoweringTemperatureInProgModeState"
+          },
+          {
+            "type": "DiscreteState",
+            "values": [
+              "boost",
+              "comfort",
+              "comfort-1",
+              "comfort-2",
+              "eco",
+              "frostprotection",
+              "off",
+              "secured"
+            ],
+            "qualifiedName": "io:TargetHeatingLevelState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "io:TemperatureProbeCalibrationOffsetState"
+          },
+          {
+            "type": "DataState",
+            "qualifiedName": "io:TensionState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "io:TimerForTransitoryStateState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "io:UptimeState"
+          }
+        ],
+        "dataProperties": [
+          {
+            "value": "500",
+            "qualifiedName": "core:identifyInterval"
+          }
+        ],
+        "widgetName": "AtlanticElectricalHeaterWithAdjustableTemperatureSetpoint",
+        "uiProfiles": [
+          "StatefulOperatingModeHeating",
+          "OperatingModeHeating",
+          "StatefulThermostat",
+          "Thermostat"
+        ],
+        "uiClass": "HeatingSystem",
+        "uiClassifiers": ["emitter"],
+        "qualifiedName": "io:AtlanticElectricalHeaterWithAdjustableTemperatureSetpointIOComponent",
+        "type": "ACTUATOR"
+      },
+      "states": [
+        {
+          "name": "core:NameState",
+          "type": 3,
+          "value": "**"
+        },
+        {
+          "name": "core:VersionState",
+          "type": 3,
+          "value": "2d202020ffffff240000"
+        },
+        {
+          "name": "core:PriorityLockTimerState",
+          "type": 1,
+          "value": 0
+        },
+        {
+          "name": "core:CommandLockLevelsState",
+          "type": 3,
+          "value": "[]",
+          "lastUpdateTime": 1722420286000
+        },
+        {
+          "name": "core:OnOffState",
+          "type": 3,
+          "value": "on"
+        },
+        {
+          "name": "io:TargetHeatingLevelState",
+          "type": 3,
+          "value": "eco"
+        },
+        {
+          "name": "core:StatusState",
+          "type": 3,
+          "value": "available"
+        },
+        {
+          "name": "core:DiscreteRSSILevelState",
+          "type": 3,
+          "value": "good"
+        },
+        {
+          "name": "core:RSSILevelState",
+          "type": 2,
+          "value": 94.0
+        },
+        {
+          "name": "core:IdentifierState",
+          "type": 3,
+          "value": "00000000"
+        },
+        {
+          "name": "io:MaximumHeatingLevelState",
+          "type": 3,
+          "value": "unknown"
+        },
+        {
+          "name": "io:TimerForTransitoryStateState",
+          "type": 1,
+          "value": 65535
+        },
+        {
+          "name": "core:ComfortRoomTemperatureState",
+          "type": 1,
+          "value": 20
+        },
+        {
+          "name": "core:EcoRoomTemperatureState",
+          "type": 2,
+          "value": 3.5
+        },
+        {
+          "name": "core:OperatingModeState",
+          "type": 3,
+          "value": "external"
+        },
+        {
+          "name": "core:OccupancyActivationState",
+          "type": 3,
+          "value": "inactive"
+        },
+        {
+          "name": "core:MaximumHeatingTargetTemperatureState",
+          "type": 2,
+          "value": 28.0
+        },
+        {
+          "name": "core:MaximumTargetTemperatureState",
+          "type": 2,
+          "value": 28.0
+        },
+        {
+          "name": "core:TargetTemperatureState",
+          "type": 2,
+          "value": 20.0
+        },
+        {
+          "name": "io:SetpointLoweringTemperatureInProgModeState",
+          "type": 2,
+          "value": 3.5
+        },
+        {
+          "name": "core:OpenWindowDetectionActivationState",
+          "type": 3,
+          "value": "inactive"
+        },
+        {
+          "name": "io:InternalExternalSchedulingTypeState",
+          "type": 3,
+          "value": "external"
+        },
+        {
+          "name": "core:DateTimeState",
+          "type": 11,
+          "value": {
+            "month": 3,
+            "hour": 10,
+            "year": 2025,
+            "weekday": 0,
+            "day": 24,
+            "minute": 20,
+            "second": 10
+          }
+        },
+        {
+          "name": "io:LocalLeadTimeState",
+          "type": 1,
+          "value": 3498
+        },
+        {
+          "name": "core:RegulationModeState",
+          "type": 3,
+          "value": "none"
+        },
+        {
+          "name": "core:ManufacturerNameState",
+          "type": 3,
+          "value": "Atlantic"
+        },
+        {
+          "name": "io:ModelState",
+          "type": 3,
+          "value": "Calissia"
+        },
+        {
+          "name": "io:PowerState",
+          "type": 1,
+          "value": 750
+        },
+        {
+          "name": "io:TensionState",
+          "type": 1,
+          "value": 230
+        },
+        {
+          "name": "core:DerogatedTargetTemperatureState",
+          "type": 2,
+          "value": 0.0
+        },
+        {
+          "name": "io:NativeFunctionalLevelState",
+          "type": 3,
+          "value": "Base"
+        },
+        {
+          "name": "io:TemperatureProbeCalibrationOffsetState",
+          "type": 2,
+          "value": 0.0
+        },
+        {
+          "name": "io:CumulatedLoweringState",
+          "type": 2,
+          "value": 0.0
+        },
+        {
+          "name": "io:RoomDeletionThresholdState",
+          "type": 3,
+          "value": "-2\u00b0C"
+        },
+        {
+          "name": "io:EffectiveTemperatureSetpointState",
+          "type": 2,
+          "value": 16.5
+        },
+        {
+          "name": "io:ControllerAddressState",
+          "type": 1,
+          "value": 11009626
+        },
+        {
+          "name": "io:AutoProgramState",
+          "type": 11,
+          "value": {
+            "sunday": [
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1"
+            ],
+            "saturday": [
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1"
+            ],
+            "tuesday": [
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1"
+            ],
+            "wednesday": [
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1"
+            ],
+            "thursday": [
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1"
+            ],
+            "friday": [
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1"
+            ],
+            "anticipTime": 3498,
+            "anticipNb": 20,
+            "monday": [
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1",
+              "CONF_NIV1"
+            ]
+          }
+        },
+        {
+          "name": "core:PreviousTargetTemperatureState",
+          "type": 2,
+          "value": 21.0
+        },
+        {
+          "name": "core:TimeProgramState",
+          "type": 10,
+          "value": [
+            {
+              "monday": [
+                {
+                  "start": "08:00",
+                  "end": "14:00"
+                },
+                {
+                  "start": "19:00",
+                  "end": "24:00"
+                },
+                {
+                  "start": "00:00",
+                  "end": "00:00"
+                }
+              ]
+            },
+            {
+              "tuesday": [
+                {
+                  "start": "08:00",
+                  "end": "14:00"
+                },
+                {
+                  "start": "19:00",
+                  "end": "24:00"
+                },
+                {
+                  "start": "00:00",
+                  "end": "00:00"
+                }
+              ]
+            },
+            {
+              "wednesday": [
+                {
+                  "start": "08:00",
+                  "end": "14:00"
+                },
+                {
+                  "start": "19:00",
+                  "end": "24:00"
+                },
+                {
+                  "start": "00:00",
+                  "end": "00:00"
+                }
+              ]
+            },
+            {
+              "thursday": [
+                {
+                  "start": "08:00",
+                  "end": "14:00"
+                },
+                {
+                  "start": "19:00",
+                  "end": "24:00"
+                },
+                {
+                  "start": "00:00",
+                  "end": "00:00"
+                }
+              ]
+            },
+            {
+              "friday": [
+                {
+                  "start": "08:00",
+                  "end": "14:00"
+                },
+                {
+                  "start": "17:00",
+                  "end": "24:00"
+                },
+                {
+                  "start": "00:00",
+                  "end": "00:00"
+                }
+              ]
+            },
+            {
+              "saturday": [
+                {
+                  "start": "12:00",
+                  "end": "24:00"
+                },
+                {
+                  "start": "00:00",
+                  "end": "00:00"
+                },
+                {
+                  "start": "00:00",
+                  "end": "00:00"
+                }
+              ]
+            },
+            {
+              "sunday": [
+                {
+                  "start": "19:00",
+                  "end": "24:00"
+                },
+                {
+                  "start": "00:00",
+                  "end": "00:00"
+                },
+                {
+                  "start": "00:00",
+                  "end": "00:00"
+                }
+              ]
+            }
+          ]
+        },
+        {
+          "name": "io:CurrentWorkingRateState",
+          "type": 2,
+          "value": 0.0
+        }
+      ],
+      "attributes": [
+        {
+          "name": "core:Manufacturer",
+          "type": 3,
+          "value": "Atlantic Group"
+        },
+        {
+          "name": "core:FirmwareRevision",
+          "type": 3,
+          "value": "2d202020ffffff240000"
+        }
+      ],
+      "available": true,
+      "enabled": true,
+      "placeOID": "61435d6a-4ba6-4c96-b7b5-105bb31d3b87",
+      "widget": "AtlanticElectricalHeaterWithAdjustableTemperatureSetpoint",
+      "type": 1,
+      "oid": "aea8fe99-ce54-4256-ba7d-d08fab636d4e",
+      "uiClass": "HeatingSystem"
+    },
+    {
+      "creationTime": 1602324374000,
+      "lastUpdateTime": 1602324374000,
+      "label": "Living Room Heater Temperature",
+      "deviceURL": "io://1234-5678-5643/11009627#2",
+      "shortcut": false,
+      "controllableName": "io:TemperatureInCelciusIOSystemDeviceSensor",
+      "definition": {
+        "commands": [],
+        "states": [
+          {
+            "type": "DiscreteState",
+            "values": ["available", "unavailable"],
+            "qualifiedName": "core:StatusState"
+          },
+          {
+            "type": "ContinuousState",
+            "qualifiedName": "core:TemperatureState"
+          }
+        ],
+        "dataProperties": [],
+        "widgetName": "TemperatureSensor",
+        "uiProfiles": ["Temperature"],
+        "uiClass": "TemperatureSensor",
+        "qualifiedName": "io:TemperatureInCelciusIOSystemDeviceSensor",
+        "type": "SENSOR"
+      },
+      "states": [
+        {
+          "name": "core:StatusState",
+          "type": 3,
+          "value": "available"
+        },
+        {
+          "name": "core:TemperatureState",
+          "type": 2,
+          "value": 20.5
+        }
+      ],
+      "attributes": [
+        {
+          "name": "core:Manufacturer",
+          "type": 3,
+          "value": "Atlantic Group"
+        },
+        {
+          "name": "core:FirmwareRevision",
+          "type": 3,
+          "value": "2d202020ffffff240000"
+        },
+        {
+          "name": "core:MeasuredValueType",
+          "type": 3,
+          "value": "core:TemperatureInCelcius"
+        },
+        {
+          "name": "core:PowerSourceType",
+          "type": 3,
+          "value": "mainSupply"
+        }
+      ],
+      "available": true,
+      "enabled": true,
+      "placeOID": "61435d6a-4ba6-4c96-b7b5-105bb31d3b87",
+      "widget": "TemperatureSensor",
+      "type": 2,
+      "oid": "2aeab205-1d3a-4a87-b171-ff6484e67852",
+      "uiClass": "TemperatureSensor"
     }
   ],
   "features": [],
diff --git a/tests/components/overkiz/snapshots/test_climate.ambr b/tests/components/overkiz/snapshots/test_climate.ambr
index 91e4b14aa5d9..a4da16cfc752 100644
--- a/tests/components/overkiz/snapshots/test_climate.ambr
+++ b/tests/components/overkiz/snapshots/test_climate.ambr
@@ -174,6 +174,100 @@
     'state': 'heat',
   })
 # ---
+# name: test_climate_entities_snapshot[cloud_atlantic_cozytouch.json][climate.my_home_living_room_heater-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': dict({
+      <ClimateEntityCapabilityAttribute.HVAC_MODES: 'hvac_modes'>: list([
+        <HVACMode.HEAT: 'heat'>,
+        <HVACMode.OFF: 'off'>,
+        <HVACMode.AUTO: 'auto'>,
+      ]),
+      <ClimateEntityCapabilityAttribute.MAX_TEMP: 'max_temp'>: 35,
+      <ClimateEntityCapabilityAttribute.MIN_TEMP: 'min_temp'>: 7,
+      <ClimateEntityCapabilityAttribute.PRESET_MODES: 'preset_modes'>: list([
+        'none',
+        'frost_protection',
+        'eco',
+        'comfort',
+        'comfort-1',
+        'comfort-2',
+        'auto',
+        'boost',
+        'external',
+        'prog',
+      ]),
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'climate',
+    'entity_category': None,
+    'entity_id': 'climate.my_home_living_room_heater',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': None,
+    'options': dict({
+    }),
+    'original_device_class': None,
+    'original_icon': None,
+    'original_name': None,
+    'platform': 'overkiz',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': <ClimateEntityFeature: 401>,
+    'translation_key': 'overkiz',
+    'unique_id': 'io://1234-5678-5643/11009627#1',
+    'unit_of_measurement': None,
+  })
+# ---
+# name: test_climate_entities_snapshot[cloud_atlantic_cozytouch.json][climate.my_home_living_room_heater-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <ClimateEntityStateAttribute.CURRENT_TEMPERATURE: 'current_temperature'>: 20.5,
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Living Room Heater',
+      <ClimateEntityStateAttribute.HVAC_ACTION: 'hvac_action'>: <HVACAction.OFF: 'off'>,
+      <ClimateEntityCapabilityAttribute.HVAC_MODES: 'hvac_modes'>: list([
+        <HVACMode.HEAT: 'heat'>,
+        <HVACMode.OFF: 'off'>,
+        <HVACMode.AUTO: 'auto'>,
+      ]),
+      <ClimateEntityCapabilityAttribute.MAX_TEMP: 'max_temp'>: 35,
+      <ClimateEntityCapabilityAttribute.MIN_TEMP: 'min_temp'>: 7,
+      <ClimateEntityStateAttribute.PRESET_MODE: 'preset_mode'>: 'eco',
+      <ClimateEntityCapabilityAttribute.PRESET_MODES: 'preset_modes'>: list([
+        'none',
+        'frost_protection',
+        'eco',
+        'comfort',
+        'comfort-1',
+        'comfort-2',
+        'auto',
+        'boost',
+        'external',
+        'prog',
+      ]),
+      <EntityStateAttribute.SUPPORTED_FEATURES: 'supported_features'>: <ClimateEntityFeature: 401>,
+      <ClimateEntityStateAttribute.TEMPERATURE: 'temperature'>: 16.5,
+    }),
+    'context': <ANY>,
+    'entity_id': 'climate.my_home_living_room_heater',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': 'auto',
+  })
+# ---
 # name: test_climate_entities_snapshot[cloud_hi_kumo_europe.json][climate.somfy_tahoma_switch_yutaki_zone_1-entry]
   EntityRegistryEntrySnapshot({
     'aliases': list([
diff --git a/tests/components/overkiz/snapshots/test_number.ambr b/tests/components/overkiz/snapshots/test_number.ambr
index fc922663a26b..cec3148a2367 100644
--- a/tests/components/overkiz/snapshots/test_number.ambr
+++ b/tests/components/overkiz/snapshots/test_number.ambr
@@ -247,6 +247,130 @@
     'state': '3',
   })
 # ---
+# name: test_number_entities_snapshot[cloud_atlantic_cozytouch.json][number.my_home_living_room_heater_comfort_room_temperature-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': dict({
+      <NumberEntityCapabilityAttribute.MAX: 'max'>: 30,
+      <NumberEntityCapabilityAttribute.MIN: 'min'>: 7,
+      <NumberEntityCapabilityAttribute.MODE: 'mode'>: <NumberMode.AUTO: 'auto'>,
+      <NumberEntityCapabilityAttribute.STEP: 'step'>: 1.0,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'number',
+    'entity_category': <EntityCategory.CONFIG: 'config'>,
+    'entity_id': 'number.my_home_living_room_heater_comfort_room_temperature',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Comfort room temperature',
+    'options': dict({
+    }),
+    'original_device_class': <NumberDeviceClass.TEMPERATURE: 'temperature'>,
+    'original_icon': 'mdi:home-thermometer-outline',
+    'original_name': 'Comfort room temperature',
+    'platform': 'overkiz',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': None,
+    'unique_id': 'io://1234-5678-5643/11009627#1-core:ComfortRoomTemperatureState',
+    'unit_of_measurement': <UnitOfTemperature.CELSIUS: '°C'>,
+  })
+# ---
+# name: test_number_entities_snapshot[cloud_atlantic_cozytouch.json][number.my_home_living_room_heater_comfort_room_temperature-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'temperature',
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Living Room Heater Comfort room temperature',
+      <EntityStateAttribute.ICON: 'icon'>: 'mdi:home-thermometer-outline',
+      <NumberEntityCapabilityAttribute.MAX: 'max'>: 30,
+      <NumberEntityCapabilityAttribute.MIN: 'min'>: 7,
+      <NumberEntityCapabilityAttribute.MODE: 'mode'>: <NumberMode.AUTO: 'auto'>,
+      <NumberEntityCapabilityAttribute.STEP: 'step'>: 1.0,
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: <UnitOfTemperature.CELSIUS: '°C'>,
+    }),
+    'context': <ANY>,
+    'entity_id': 'number.my_home_living_room_heater_comfort_room_temperature',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '20',
+  })
+# ---
+# name: test_number_entities_snapshot[cloud_atlantic_cozytouch.json][number.my_home_living_room_heater_eco_room_temperature-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': dict({
+      <NumberEntityCapabilityAttribute.MAX: 'max'>: 29,
+      <NumberEntityCapabilityAttribute.MIN: 'min'>: 6,
+      <NumberEntityCapabilityAttribute.MODE: 'mode'>: <NumberMode.AUTO: 'auto'>,
+      <NumberEntityCapabilityAttribute.STEP: 'step'>: 1.0,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'number',
+    'entity_category': <EntityCategory.CONFIG: 'config'>,
+    'entity_id': 'number.my_home_living_room_heater_eco_room_temperature',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Eco room temperature',
+    'options': dict({
+    }),
+    'original_device_class': <NumberDeviceClass.TEMPERATURE: 'temperature'>,
+    'original_icon': 'mdi:thermometer',
+    'original_name': 'Eco room temperature',
+    'platform': 'overkiz',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': None,
+    'unique_id': 'io://1234-5678-5643/11009627#1-core:EcoRoomTemperatureState',
+    'unit_of_measurement': <UnitOfTemperature.CELSIUS: '°C'>,
+  })
+# ---
+# name: test_number_entities_snapshot[cloud_atlantic_cozytouch.json][number.my_home_living_room_heater_eco_room_temperature-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'temperature',
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Living Room Heater Eco room temperature',
+      <EntityStateAttribute.ICON: 'icon'>: 'mdi:thermometer',
+      <NumberEntityCapabilityAttribute.MAX: 'max'>: 29,
+      <NumberEntityCapabilityAttribute.MIN: 'min'>: 6,
+      <NumberEntityCapabilityAttribute.MODE: 'mode'>: <NumberMode.AUTO: 'auto'>,
+      <NumberEntityCapabilityAttribute.STEP: 'step'>: 1.0,
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: <UnitOfTemperature.CELSIUS: '°C'>,
+    }),
+    'context': <ANY>,
+    'entity_id': 'number.my_home_living_room_heater_eco_room_temperature',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '3.5',
+  })
+# ---
 # name: test_number_entities_snapshot[cloud_atlantic_cozytouch.json][number.my_home_patio_water_heating_away_mode_duration-entry]
   EntityRegistryEntrySnapshot({
     'aliases': list([
diff --git a/tests/components/overkiz/snapshots/test_sensor.ambr b/tests/components/overkiz/snapshots/test_sensor.ambr
index 6d75dfd7d337..cac6bdb103e2 100644
--- a/tests/components/overkiz/snapshots/test_sensor.ambr
+++ b/tests/components/overkiz/snapshots/test_sensor.ambr
@@ -280,6 +280,287 @@
     'state': '74',
   })
 # ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_discrete_rssi_level-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': dict({
+      <SensorEntityCapabilityAttribute.OPTIONS: 'options'>: list([
+        'verylow',
+        'low',
+        'normal',
+        'good',
+      ]),
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
+    'entity_id': 'sensor.my_home_living_room_heater_discrete_rssi_level',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Discrete RSSI level',
+    'options': dict({
+    }),
+    'original_device_class': <SensorDeviceClass.ENUM: 'enum'>,
+    'original_icon': 'mdi:wifi',
+    'original_name': 'Discrete RSSI level',
+    'platform': 'overkiz',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'discrete_rssi_level',
+    'unique_id': 'io://1234-5678-5643/11009627#1-core:DiscreteRSSILevelState',
+    'unit_of_measurement': None,
+  })
+# ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_discrete_rssi_level-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'enum',
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Living Room Heater Discrete RSSI level',
+      <EntityStateAttribute.ICON: 'icon'>: 'mdi:wifi',
+      <SensorEntityCapabilityAttribute.OPTIONS: 'options'>: list([
+        'verylow',
+        'low',
+        'normal',
+        'good',
+      ]),
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.my_home_living_room_heater_discrete_rssi_level',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': 'good',
+  })
+# ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_living_room_heater_temperature_temperature-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': dict({
+      <SensorEntityCapabilityAttribute.STATE_CLASS: 'state_class'>: <SensorStateClass.MEASUREMENT: 'measurement'>,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': None,
+    'entity_id': 'sensor.my_home_living_room_heater_living_room_heater_temperature_temperature',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Living Room Heater Temperature Temperature',
+    'options': dict({
+      'sensor': dict({
+        'suggested_display_precision': 1,
+      }),
+    }),
+    'original_device_class': <SensorDeviceClass.TEMPERATURE: 'temperature'>,
+    'original_icon': None,
+    'original_name': 'Living Room Heater Temperature Temperature',
+    'platform': 'overkiz',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': None,
+    'unique_id': 'io://1234-5678-5643/11009627#2-core:TemperatureState',
+    'unit_of_measurement': <UnitOfTemperature.CELSIUS: '°C'>,
+  })
+# ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_living_room_heater_temperature_temperature-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'temperature',
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Living Room Heater Living Room Heater Temperature Temperature',
+      <SensorEntityCapabilityAttribute.STATE_CLASS: 'state_class'>: <SensorStateClass.MEASUREMENT: 'measurement'>,
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: <UnitOfTemperature.CELSIUS: '°C'>,
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.my_home_living_room_heater_living_room_heater_temperature_temperature',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '20.5',
+  })
+# ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_priority_lock_originator-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': None,
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': None,
+    'entity_id': 'sensor.my_home_living_room_heater_priority_lock_originator',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Priority lock originator',
+    'options': dict({
+    }),
+    'original_device_class': None,
+    'original_icon': 'mdi:lock',
+    'original_name': 'Priority lock originator',
+    'platform': 'overkiz',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'priority_lock_originator',
+    'unique_id': 'io://1234-5678-5643/11009627#1-io:PriorityLockOriginatorState',
+    'unit_of_measurement': None,
+  })
+# ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_priority_lock_originator-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Living Room Heater Priority lock originator',
+      <EntityStateAttribute.ICON: 'icon'>: 'mdi:lock',
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.my_home_living_room_heater_priority_lock_originator',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': 'unknown',
+  })
+# ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_priority_lock_timer-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': None,
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': None,
+    'entity_id': 'sensor.my_home_living_room_heater_priority_lock_timer',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Priority lock timer',
+    'options': dict({
+    }),
+    'original_device_class': None,
+    'original_icon': 'mdi:lock-clock',
+    'original_name': 'Priority lock timer',
+    'platform': 'overkiz',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': None,
+    'unique_id': 'io://1234-5678-5643/11009627#1-core:PriorityLockTimerState',
+    'unit_of_measurement': <UnitOfTime.SECONDS: 's'>,
+  })
+# ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_priority_lock_timer-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Living Room Heater Priority lock timer',
+      <EntityStateAttribute.ICON: 'icon'>: 'mdi:lock-clock',
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: <UnitOfTime.SECONDS: 's'>,
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.my_home_living_room_heater_priority_lock_timer',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': 'unknown',
+  })
+# ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_rssi_level-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': dict({
+      <SensorEntityCapabilityAttribute.STATE_CLASS: 'state_class'>: <SensorStateClass.MEASUREMENT: 'measurement'>,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
+    'entity_id': 'sensor.my_home_living_room_heater_rssi_level',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'RSSI level',
+    'options': dict({
+    }),
+    'original_device_class': <SensorDeviceClass.SIGNAL_STRENGTH: 'signal_strength'>,
+    'original_icon': None,
+    'original_name': 'RSSI level',
+    'platform': 'overkiz',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': None,
+    'unique_id': 'io://1234-5678-5643/11009627#1-core:RSSILevelState',
+    'unit_of_measurement': 'dB',
+  })
+# ---
+# name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_living_room_heater_rssi_level-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'signal_strength',
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Living Room Heater RSSI level',
+      <SensorEntityCapabilityAttribute.STATE_CLASS: 'state_class'>: <SensorStateClass.MEASUREMENT: 'measurement'>,
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: 'dB',
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.my_home_living_room_heater_rssi_level',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '94',
+  })
+# ---
 # name: test_sensor_entities_snapshot[cloud_atlantic_cozytouch.json][sensor.my_home_patio_water_heating_bottom_tank_water_temperature-entry]
   EntityRegistryEntrySnapshot({
     'aliases': list([
diff --git a/tests/components/overkiz/test_climate.py b/tests/components/overkiz/test_climate.py
index 8d11067804c8..d032668a54a2 100644
--- a/tests/components/overkiz/test_climate.py
+++ b/tests/components/overkiz/test_climate.py
@@ -45,6 +45,12 @@ COZYTOUCH = FixtureDevice(
     "modbuslink://1234-5678-5643/1#1",
     "climate.living_room_heater",
 )
+# Atlantic Calissia (io:AtlanticElectricalHeaterWithAdjustableTemperatureSetpointIOComponent)
+ELECTRICAL_HEATER_ADJUSTABLE = FixtureDevice(
+    "setup/cloud_atlantic_cozytouch.json",
+    "io://1234-5678-5643/11009627#1",
+    "climate.my_home_living_room_heater",
+)
 
 # Hitachi Yutaki 2-zone air-to-water heat pump
 YUTAKI_ZONE_1 = FixtureDevice(
@@ -171,6 +177,145 @@ async def test_events_for_unknown_device_url(
     assert state is not None
 
 
+async def test_electrical_heater_adjustable_target_temperature(
+    hass: HomeAssistant,
+    freezer: FrozenDateTimeFactory,
+    mock_client: MockOverkizClient,
+    setup_overkiz_integration: SetupOverkizIntegration,
+) -> None:
+    """Test target_temperature tracks the effective setpoint only in auto mode."""
+    await setup_overkiz_integration(fixture=ELECTRICAL_HEATER_ADJUSTABLE.fixture)
+
+    # Fixture starts in auto (external) mode with the eco preset active.
+    state = hass.states.get(ELECTRICAL_HEATER_ADJUSTABLE.entity_id)
+    assert state is not None
+    assert state.attributes[ATTR_TEMPERATURE] == 16.5
+
+    # The preset changes to comfort while still scheduled (auto).
+    await async_deliver_events(
+        hass,
+        freezer,
+        mock_client,
+        [
+            device_state_changed_event(
+                device_url=ELECTRICAL_HEATER_ADJUSTABLE.device_url,
+                device_states=[
+                    {
+                        "name": OverkizState.IO_TARGET_HEATING_LEVEL,
+                        "type": 3,
+                        "value": "comfort",
+                    },
+                    {
+                        "name": OverkizState.IO_EFFECTIVE_TEMPERATURE_SETPOINT,
+                        "type": 2,
+                        "value": 20.0,
+                    },
+                ],
+            )
+        ],
+    )
+    state = hass.states.get(ELECTRICAL_HEATER_ADJUSTABLE.entity_id)
+    assert state is not None
+    assert state.attributes[ATTR_TEMPERATURE] == 20.0
+
+    # While scheduled (auto), setting a temperature derogates the active
+    # preset instead of overwriting the comfort setpoint.
+    await hass.services.async_call(
+        "climate",
+        "set_temperature",
+        {"entity_id": ELECTRICAL_HEATER_ADJUSTABLE.entity_id, ATTR_TEMPERATURE: 19.0},
+        blocking=True,
+    )
+    assert_command_call(
+        mock_client,
+        device_url=ELECTRICAL_HEATER_ADJUSTABLE.device_url,
+        command_name="setDerogatedTargetTemperature",
+        parameters=[19.0],
+    )
+
+    # The device reports the derogation by updating the effective setpoint.
+    await async_deliver_events(
+        hass,
+        freezer,
+        mock_client,
+        [
+            device_state_changed_event(
+                device_url=ELECTRICAL_HEATER_ADJUSTABLE.device_url,
+                device_states=[
+                    {
+                        "name": OverkizState.IO_EFFECTIVE_TEMPERATURE_SETPOINT,
+                        "type": 2,
+                        "value": 19.0,
+                    },
+                ],
+            )
+        ],
+    )
+    state = hass.states.get(ELECTRICAL_HEATER_ADJUSTABLE.entity_id)
+    assert state is not None
+    assert state.attributes[ATTR_TEMPERATURE] == 19.0
+
+    mock_client.execute_action_group.reset_mock()
+
+    # Leaving auto (scheduled) mode for manual falls back to
+    # core:TargetTemperatureState, and setting a temperature now targets
+    # that state directly instead of derogating.
+    await async_deliver_events(
+        hass,
+        freezer,
+        mock_client,
+        [
+            device_state_changed_event(
+                device_url=ELECTRICAL_HEATER_ADJUSTABLE.device_url,
+                device_states=[
+                    {
+                        "name": OverkizState.CORE_OPERATING_MODE,
+                        "type": 3,
+                        "value": "manual",
+                    },
+                ],
+            )
+        ],
+    )
+    state = hass.states.get(ELECTRICAL_HEATER_ADJUSTABLE.entity_id)
+    assert state is not None
+    assert state.attributes[ATTR_TEMPERATURE] == 20.0
+
+    await hass.services.async_call(
+        "climate",
+        "set_temperature",
+        {"entity_id": ELECTRICAL_HEATER_ADJUSTABLE.entity_id, ATTR_TEMPERATURE: 21.0},
+        blocking=True,
+    )
+    assert_command_call(
+        mock_client,
+        device_url=ELECTRICAL_HEATER_ADJUSTABLE.device_url,
+        command_name="setTargetTemperature",
+        parameters=[21.0],
+    )
+
+    await async_deliver_events(
+        hass,
+        freezer,
+        mock_client,
+        [
+            device_state_changed_event(
+                device_url=ELECTRICAL_HEATER_ADJUSTABLE.device_url,
+                device_states=[
+                    {
+                        "name": OverkizState.CORE_TARGET_TEMPERATURE,
+                        "type": 2,
+                        "value": 21.0,
+                    },
+                ],
+            )
+        ],
+    )
+    state = hass.states.get(ELECTRICAL_HEATER_ADJUSTABLE.entity_id)
+    assert state is not None
+    assert state.attributes[ATTR_TEMPERATURE] == 21.0
+
+
 async def test_hitachi_air_to_water_heating_zone_2(
     hass: HomeAssistant,
     setup_overkiz_integration: SetupOverkizIntegration,