diff --git a/homeassistant/components/mill/climate.py b/homeassistant/components/mill/climate.py
index 2e7b22da833..a2e70b8f9c8 100644
--- a/homeassistant/components/mill/climate.py
+++ b/homeassistant/components/mill/climate.py
@@ -1,4 +1,5 @@
 """Support for mill wifi-enabled home heaters."""
+
 from typing import Any
 
 import mill
@@ -186,9 +187,14 @@ class LocalMillHeater(CoordinatorEntity[MillDataUpdateCoordinator], ClimateEntit
     _attr_max_temp = MAX_TEMP
     _attr_min_temp = MIN_TEMP
     _attr_name = None
-    _attr_supported_features = ClimateEntityFeature.TARGET_TEMPERATURE
+    _attr_supported_features = (
+        ClimateEntityFeature.TARGET_TEMPERATURE
+        | ClimateEntityFeature.TURN_OFF
+        | ClimateEntityFeature.TURN_ON
+    )
     _attr_target_temperature_step = PRECISION_TENTHS
     _attr_temperature_unit = UnitOfTemperature.CELSIUS
+    _enable_turn_on_off_backwards_compatibility = False
 
     def __init__(self, coordinator: MillDataUpdateCoordinator) -> None:
         """Initialize the thermostat."""