diff --git a/homeassistant/components/melnor/entity.py b/homeassistant/components/melnor/entity.py
index 21a4e75ff21d..2f1b5f909280 100644
--- a/homeassistant/components/melnor/entity.py
+++ b/homeassistant/components/melnor/entity.py
@@ -6,7 +6,7 @@ from melnor_bluetooth.device import Device, Valve
 
 from homeassistant.components.number import EntityDescription
 from homeassistant.core import callback
-from homeassistant.helpers.device_registry import DeviceInfo
+from homeassistant.helpers.device_registry import CONNECTION_BLUETOOTH, DeviceInfo
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
 
 from .const import DOMAIN
@@ -30,6 +30,7 @@ class MelnorBluetoothEntity(CoordinatorEntity[MelnorDataUpdateCoordinator]):
 
         self._attr_device_info = DeviceInfo(
             identifiers={(DOMAIN, self._device.mac)},
+            connections={(CONNECTION_BLUETOOTH, self._device.mac)},
             manufacturer="Melnor",
             model=self._device.model,
             name=self._device.name,
diff --git a/tests/components/melnor/snapshots/test_init.ambr b/tests/components/melnor/snapshots/test_init.ambr
new file mode 100644
index 000000000000..575043cb8cdc
--- /dev/null
+++ b/tests/components/melnor/snapshots/test_init.ambr
@@ -0,0 +1,36 @@
+# serializer version: 1
+# name: test_device_registry
+  DeviceRegistryEntrySnapshot({
+    'area_id': None,
+    'config_entries': <ANY>,
+    'config_entries_subentries': <ANY>,
+    'configuration_url': None,
+    'connections': set({
+      tuple(
+        'bluetooth',
+        'FAKE-ADDRESS-1',
+      ),
+    }),
+    'disabled_by': None,
+    'entry_type': None,
+    'hw_version': None,
+    'id': <ANY>,
+    'identifiers': set({
+      tuple(
+        'melnor',
+        'FAKE-ADDRESS-1',
+      ),
+    }),
+    'labels': set({
+    }),
+    'manufacturer': 'Melnor',
+    'model': 'test_model',
+    'model_id': None,
+    'name': 'test_melnor',
+    'name_by_user': None,
+    'primary_config_entry': <ANY>,
+    'serial_number': None,
+    'sw_version': None,
+    'via_device_id': None,
+  })
+# ---
diff --git a/tests/components/melnor/test_init.py b/tests/components/melnor/test_init.py
new file mode 100644
index 000000000000..229d1b3cc337
--- /dev/null
+++ b/tests/components/melnor/test_init.py
@@ -0,0 +1,37 @@
+"""Test the Melnor integration setup."""
+
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.components.melnor.const import DOMAIN
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr
+
+from .conftest import (
+    FAKE_ADDRESS_1,
+    mock_config_entry,
+    patch_async_ble_device_from_address,
+    patch_async_register_callback,
+    patch_melnor_device,
+)
+
+
+async def test_device_registry(
+    hass: HomeAssistant,
+    device_registry: dr.DeviceRegistry,
+    snapshot: SnapshotAssertion,
+) -> None:
+    """Test the device registry entry, including the Bluetooth connection."""
+    entry = mock_config_entry(hass)
+
+    with (
+        patch_async_ble_device_from_address(),
+        patch_melnor_device(),
+        patch_async_register_callback(),
+    ):
+        assert await hass.config_entries.async_setup(entry.entry_id)
+        await hass.async_block_till_done()
+
+    device_entry = device_registry.async_get_device(
+        identifiers={(DOMAIN, FAKE_ADDRESS_1)}
+    )
+    assert device_entry == snapshot