diff --git a/custom_components/luxtronik/model.py b/custom_components/luxtronik/model.py
index b60ffb4..9831594 100644
--- a/custom_components/luxtronik/model.py
+++ b/custom_components/luxtronik/model.py
@@ -187,7 +187,7 @@ class LuxtronikWaterHeaterDescription(
     luxtronik_key_target_temperature: LuxParameter = LuxParameter.UNSET
     luxtronik_key_target_temperature_high: LuxParameter = LuxParameter.UNSET
     luxtronik_key_target_temperature_low: LuxParameter = LuxParameter.UNSET
-    temperature_unit: str = UnitOfTemperature.CELSIUS
+    temperature_unit: str = UnitOfTemperature.CELSIUS.value
 
 
 @dataclass