diff --git a/homeassistant/components/mill/climate.py b/homeassistant/components/mill/climate.py
index 0df2fe9335e..3cd9247c63a 100644
--- a/homeassistant/components/mill/climate.py
+++ b/homeassistant/components/mill/climate.py
@@ -105,10 +105,8 @@ class MillHeater(MillBaseEntity, ClimateEntity):
         self, coordinator: MillDataUpdateCoordinator, device: mill.Heater
     ) -> None:
         """Initialize the thermostat."""
-
-        super().__init__(coordinator, device)
         self._attr_unique_id = device.device_id
-        self._update_attr(device)
+        super().__init__(coordinator, device)
 
     async def async_set_temperature(self, **kwargs: Any) -> None:
         """Set new target temperature."""
diff --git a/homeassistant/components/mill/entity.py b/homeassistant/components/mill/entity.py
index f24dbeb2c26..06056aba336 100644
--- a/homeassistant/components/mill/entity.py
+++ b/homeassistant/components/mill/entity.py
@@ -4,7 +4,7 @@ from __future__ import annotations
 
 from abc import abstractmethod
 
-from mill import Heater, MillDevice
+from mill import MillDevice
 
 from homeassistant.core import callback
 from homeassistant.helpers.device_registry import DeviceInfo
@@ -45,7 +45,7 @@ class MillBaseEntity(CoordinatorEntity[MillDataUpdateCoordinator]):
 
     @abstractmethod
     @callback
-    def _update_attr(self, device: MillDevice | Heater) -> None:
+    def _update_attr(self, device: MillDevice) -> None:
         """Update the attribute of the entity."""
 
     @property
diff --git a/homeassistant/components/mill/number.py b/homeassistant/components/mill/number.py
index af27159caf0..b4ef7bdd2c2 100644
--- a/homeassistant/components/mill/number.py
+++ b/homeassistant/components/mill/number.py
@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from mill import MillDevice
+from mill import Heater, MillDevice
 
 from homeassistant.components.number import NumberDeviceClass, NumberEntity
 from homeassistant.config_entries import ConfigEntry
@@ -27,6 +27,7 @@ async def async_setup_entry(
         async_add_entities(
             MillNumber(mill_data_coordinator, mill_device)
             for mill_device in mill_data_coordinator.data.values()
+            if isinstance(mill_device, Heater)
         )
 
 
@@ -45,9 +46,8 @@ class MillNumber(MillBaseEntity, NumberEntity):
         mill_device: MillDevice,
     ) -> None:
         """Initialize the number."""
-        super().__init__(coordinator, mill_device)
         self._attr_unique_id = f"{mill_device.device_id}_max_heating_power"
-        self._update_attr(mill_device)
+        super().__init__(coordinator, mill_device)
 
     @callback
     def _update_attr(self, device: MillDevice) -> None:
diff --git a/homeassistant/components/mill/sensor.py b/homeassistant/components/mill/sensor.py
index 018b9466deb..57eead9be18 100644
--- a/homeassistant/components/mill/sensor.py
+++ b/homeassistant/components/mill/sensor.py
@@ -192,9 +192,9 @@ class MillSensor(MillBaseEntity, SensorEntity):
         mill_device: mill.Socket | mill.Heater,
     ) -> None:
         """Initialize the sensor."""
-        super().__init__(coordinator, mill_device)
         self.entity_description = entity_description
         self._attr_unique_id = f"{mill_device.device_id}_{entity_description.key}"
+        super().__init__(coordinator, mill_device)
 
     @callback
     def _update_attr(self, device):