diff --git a/.strict-typing b/.strict-typing
index 6f08b8e6e14..f2bef7f82dd 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -131,6 +131,7 @@ homeassistant.components.bring.*
 homeassistant.components.brother.*
 homeassistant.components.browser.*
 homeassistant.components.bryant_evolution.*
+homeassistant.components.bsblan.*
 homeassistant.components.bthome.*
 homeassistant.components.button.*
 homeassistant.components.calendar.*
diff --git a/homeassistant/components/bsblan/climate.py b/homeassistant/components/bsblan/climate.py
index c6de76d056b..6a6aa46b9e9 100644
--- a/homeassistant/components/bsblan/climate.py
+++ b/homeassistant/components/bsblan/climate.py
@@ -101,16 +101,16 @@ class BSBLANClimate(BSBLanEntity, ClimateEntity):
     @property
     def current_temperature(self) -> float | None:
         """Return the current temperature."""
-        if self.coordinator.data.state.current_temperature is None:
+        if (current_temp := self.coordinator.data.state.current_temperature) is None:
             return None
-        return self.coordinator.data.state.current_temperature.value
+        return current_temp.value
 
     @property
     def target_temperature(self) -> float | None:
         """Return the temperature we try to reach."""
-        if self.coordinator.data.state.target_temperature is None:
+        if (target_temp := self.coordinator.data.state.target_temperature) is None:
             return None
-        return self.coordinator.data.state.target_temperature.value
+        return target_temp.value
 
     @property
     def _hvac_mode_value(self) -> int | str | None:
diff --git a/homeassistant/components/bsblan/coordinator.py b/homeassistant/components/bsblan/coordinator.py
index b39376f6f02..f708b05de5e 100644
--- a/homeassistant/components/bsblan/coordinator.py
+++ b/homeassistant/components/bsblan/coordinator.py
@@ -1,7 +1,10 @@
 """DataUpdateCoordinator for the BSB-Lan integration."""
 
+from __future__ import annotations
+
 from dataclasses import dataclass
 from datetime import timedelta
+from typing import TYPE_CHECKING
 
 from bsblan import (
     BSBLAN,
@@ -14,7 +17,6 @@ from bsblan import (
     State,
 )
 
-from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_HOST
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import ConfigEntryAuthFailed
@@ -22,6 +24,9 @@ from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, Upda
 
 from .const import DOMAIN, LOGGER, SCAN_INTERVAL_FAST, SCAN_INTERVAL_SLOW
 
+if TYPE_CHECKING:
+    from . import BSBLanConfigEntry
+
 # Filter lists for optimized API calls - only fetch parameters we actually use
 # This significantly reduces response time (~0.2s per parameter saved)
 STATE_INCLUDE = ["current_temperature", "target_temperature", "hvac_mode"]
@@ -54,12 +59,12 @@ class BSBLanSlowData:
 class BSBLanCoordinator[T](DataUpdateCoordinator[T]):
     """Base BSB-Lan coordinator."""
 
-    config_entry: ConfigEntry
+    config_entry: BSBLanConfigEntry
 
     def __init__(
         self,
         hass: HomeAssistant,
-        config_entry: ConfigEntry,
+        config_entry: BSBLanConfigEntry,
         client: BSBLAN,
         name: str,
         update_interval: timedelta,
@@ -81,7 +86,7 @@ class BSBLanFastCoordinator(BSBLanCoordinator[BSBLanFastData]):
     def __init__(
         self,
         hass: HomeAssistant,
-        config_entry: ConfigEntry,
+        config_entry: BSBLanConfigEntry,
         client: BSBLAN,
     ) -> None:
         """Initialize the BSB-Lan fast coordinator."""
@@ -126,7 +131,7 @@ class BSBLanSlowCoordinator(BSBLanCoordinator[BSBLanSlowData]):
     def __init__(
         self,
         hass: HomeAssistant,
-        config_entry: ConfigEntry,
+        config_entry: BSBLanConfigEntry,
         client: BSBLAN,
     ) -> None:
         """Initialize the BSB-Lan slow coordinator."""
diff --git a/homeassistant/components/bsblan/water_heater.py b/homeassistant/components/bsblan/water_heater.py
index f871e890f0d..a4aa23f96f3 100644
--- a/homeassistant/components/bsblan/water_heater.py
+++ b/homeassistant/components/bsblan/water_heater.py
@@ -110,27 +110,28 @@ class BSBLANWaterHeater(BSBLanDualCoordinatorEntity, WaterHeaterEntity):
     @property
     def current_operation(self) -> str | None:
         """Return current operation."""
-        if self.coordinator.data.dhw.operating_mode is None:
+        if (operating_mode := self.coordinator.data.dhw.operating_mode) is None:
             return None
         # The operating_mode.value is an integer (0=Off, 1=On, 2=Eco)
-        current_mode_value = self.coordinator.data.dhw.operating_mode.value
-        if isinstance(current_mode_value, int):
-            return BSBLAN_TO_HA_OPERATION_MODE.get(current_mode_value)
+        if isinstance(operating_mode.value, int):
+            return BSBLAN_TO_HA_OPERATION_MODE.get(operating_mode.value)
         return None
 
     @property
     def current_temperature(self) -> float | None:
         """Return the current temperature."""
-        if self.coordinator.data.dhw.dhw_actual_value_top_temperature is None:
+        if (
+            current_temp := self.coordinator.data.dhw.dhw_actual_value_top_temperature
+        ) is None:
             return None
-        return self.coordinator.data.dhw.dhw_actual_value_top_temperature.value
+        return current_temp.value
 
     @property
     def target_temperature(self) -> float | None:
         """Return the temperature we try to reach."""
-        if self.coordinator.data.dhw.nominal_setpoint is None:
+        if (target_temp := self.coordinator.data.dhw.nominal_setpoint) is None:
             return None
-        return self.coordinator.data.dhw.nominal_setpoint.value
+        return target_temp.value
 
     async def async_set_temperature(self, **kwargs: Any) -> None:
         """Set new target temperature."""
diff --git a/mypy.ini b/mypy.ini
index d32fc0567dc..814b8ce0402 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1065,6 +1065,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.bsblan.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.bthome.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true