diff --git a/homeassistant/components/humidifier/__init__.py b/homeassistant/components/humidifier/__init__.py
index ef1620b3922..976dad03a45 100644
--- a/homeassistant/components/humidifier/__init__.py
+++ b/homeassistant/components/humidifier/__init__.py
@@ -143,13 +143,12 @@ class HumidifierEntity(ToggleEntity):
     @property
     def capability_attributes(self) -> dict[str, Any]:
         """Return capability attributes."""
-        supported_features = self.supported_features or 0
         data: dict[str, int | list[str] | None] = {
             ATTR_MIN_HUMIDITY: self.min_humidity,
             ATTR_MAX_HUMIDITY: self.max_humidity,
         }
 
-        if supported_features & HumidifierEntityFeature.MODES:
+        if self.supported_features & HumidifierEntityFeature.MODES:
             data[ATTR_AVAILABLE_MODES] = self.available_modes
 
         return data
@@ -167,13 +166,12 @@ class HumidifierEntity(ToggleEntity):
     @property
     def state_attributes(self) -> dict[str, Any]:
         """Return the optional state attributes."""
-        supported_features = self.supported_features or 0
         data: dict[str, int | str | None] = {}
 
         if self.target_humidity is not None:
             data[ATTR_HUMIDITY] = self.target_humidity
 
-        if supported_features & HumidifierEntityFeature.MODES:
+        if self.supported_features & HumidifierEntityFeature.MODES:
             data[ATTR_MODE] = self.mode
 
         return data
diff --git a/homeassistant/components/media_player/__init__.py b/homeassistant/components/media_player/__init__.py
index 0e17d5c5339..120a1128597 100644
--- a/homeassistant/components/media_player/__init__.py
+++ b/homeassistant/components/media_player/__init__.py
@@ -1000,15 +1000,14 @@ class MediaPlayerEntity(Entity):
     @property
     def capability_attributes(self) -> dict[str, Any]:
         """Return capability attributes."""
-        supported_features = self.supported_features or 0
         data: dict[str, Any] = {}
 
-        if supported_features & MediaPlayerEntityFeature.SELECT_SOURCE and (
+        if self.supported_features & MediaPlayerEntityFeature.SELECT_SOURCE and (
             source_list := self.source_list
         ):
             data[ATTR_INPUT_SOURCE_LIST] = source_list
 
-        if supported_features & MediaPlayerEntityFeature.SELECT_SOUND_MODE and (
+        if self.supported_features & MediaPlayerEntityFeature.SELECT_SOUND_MODE and (
             sound_mode_list := self.sound_mode_list
         ):
             data[ATTR_SOUND_MODE_LIST] = sound_mode_list
diff --git a/homeassistant/components/siren/__init__.py b/homeassistant/components/siren/__init__.py
index faf8caf8ed0..0bc16d03770 100644
--- a/homeassistant/components/siren/__init__.py
+++ b/homeassistant/components/siren/__init__.py
@@ -64,9 +64,8 @@ def process_turn_on_params(
 
     Filters out unsupported params and validates the rest.
     """
-    supported_features = siren.supported_features or 0
 
-    if not supported_features & SirenEntityFeature.TONES:
+    if not siren.supported_features & SirenEntityFeature.TONES:
         params.pop(ATTR_TONE, None)
     elif (tone := params.get(ATTR_TONE)) is not None:
         # Raise an exception if the specified tone isn't available
@@ -92,9 +91,9 @@ def process_turn_on_params(
                 key for key, value in siren.available_tones.items() if value == tone
             )
 
-    if not supported_features & SirenEntityFeature.DURATION:
+    if not siren.supported_features & SirenEntityFeature.DURATION:
         params.pop(ATTR_DURATION, None)
-    if not supported_features & SirenEntityFeature.VOLUME_SET:
+    if not siren.supported_features & SirenEntityFeature.VOLUME_SET:
         params.pop(ATTR_VOLUME_LEVEL, None)
 
     return params
@@ -169,10 +168,8 @@ class SirenEntity(ToggleEntity):
     @property
     def capability_attributes(self) -> dict[str, Any] | None:
         """Return capability attributes."""
-        supported_features = self.supported_features or 0
-
         if (
-            supported_features & SirenEntityFeature.TONES
+            self.supported_features & SirenEntityFeature.TONES
             and self.available_tones is not None
         ):
             return {ATTR_AVAILABLE_TONES: self.available_tones}
diff --git a/homeassistant/components/water_heater/__init__.py b/homeassistant/components/water_heater/__init__.py
index 187c643638b..4396c66cf22 100644
--- a/homeassistant/components/water_heater/__init__.py
+++ b/homeassistant/components/water_heater/__init__.py
@@ -191,8 +191,6 @@ class WaterHeaterEntity(Entity):
     @property
     def capability_attributes(self) -> Mapping[str, Any]:
         """Return capability attributes."""
-        supported_features = self.supported_features or 0
-
         data: dict[str, Any] = {
             ATTR_MIN_TEMP: show_temp(
                 self.hass, self.min_temp, self.temperature_unit, self.precision
@@ -202,7 +200,7 @@ class WaterHeaterEntity(Entity):
             ),
         }
 
-        if supported_features & WaterHeaterEntityFeature.OPERATION_MODE:
+        if self.supported_features & WaterHeaterEntityFeature.OPERATION_MODE:
             data[ATTR_OPERATION_LIST] = self.operation_list
 
         return data
@@ -238,12 +236,10 @@ class WaterHeaterEntity(Entity):
             ),
         }
 
-        supported_features = self.supported_features or 0
-
-        if supported_features & WaterHeaterEntityFeature.OPERATION_MODE:
+        if self.supported_features & WaterHeaterEntityFeature.OPERATION_MODE:
             data[ATTR_OPERATION_MODE] = self.current_operation
 
-        if supported_features & WaterHeaterEntityFeature.AWAY_MODE:
+        if self.supported_features & WaterHeaterEntityFeature.AWAY_MODE:
             is_away = self.is_away_mode_on
             data[ATTR_AWAY_MODE] = STATE_ON if is_away else STATE_OFF