diff --git a/homeassistant/components/number/const.py b/homeassistant/components/number/const.py
index f44a510b1c0..280edb819d4 100644
--- a/homeassistant/components/number/const.py
+++ b/homeassistant/components/number/const.py
@@ -323,7 +323,7 @@ class NumberDeviceClass(StrEnum):
     REACTIVE_POWER = "reactive_power"
     """Reactive power.
 
-    Unit of measurement: `var`
+    Unit of measurement: `var`, `kvar`
     """
 
     SIGNAL_STRENGTH = "signal_strength"
@@ -497,7 +497,7 @@ DEVICE_CLASS_UNITS: dict[NumberDeviceClass, set[type[StrEnum] | str | None]] = {
     NumberDeviceClass.PRECIPITATION: set(UnitOfPrecipitationDepth),
     NumberDeviceClass.PRECIPITATION_INTENSITY: set(UnitOfVolumetricFlux),
     NumberDeviceClass.PRESSURE: set(UnitOfPressure),
-    NumberDeviceClass.REACTIVE_POWER: {UnitOfReactivePower.VOLT_AMPERE_REACTIVE},
+    NumberDeviceClass.REACTIVE_POWER: set(UnitOfReactivePower),
     NumberDeviceClass.SIGNAL_STRENGTH: {
         SIGNAL_STRENGTH_DECIBELS,
         SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
diff --git a/homeassistant/components/sensor/const.py b/homeassistant/components/sensor/const.py
index 63af8e5bf52..c845980e9df 100644
--- a/homeassistant/components/sensor/const.py
+++ b/homeassistant/components/sensor/const.py
@@ -352,7 +352,7 @@ class SensorDeviceClass(StrEnum):
     REACTIVE_POWER = "reactive_power"
     """Reactive power.
 
-    Unit of measurement: `var`
+    Unit of measurement: `var`, `kvar`
     """
 
     SIGNAL_STRENGTH = "signal_strength"
@@ -596,7 +596,7 @@ DEVICE_CLASS_UNITS: dict[SensorDeviceClass, set[type[StrEnum] | str | None]] = {
     SensorDeviceClass.PRECIPITATION: set(UnitOfPrecipitationDepth),
     SensorDeviceClass.PRECIPITATION_INTENSITY: set(UnitOfVolumetricFlux),
     SensorDeviceClass.PRESSURE: set(UnitOfPressure),
-    SensorDeviceClass.REACTIVE_POWER: {UnitOfReactivePower.VOLT_AMPERE_REACTIVE},
+    SensorDeviceClass.REACTIVE_POWER: set(UnitOfReactivePower),
     SensorDeviceClass.SIGNAL_STRENGTH: {
         SIGNAL_STRENGTH_DECIBELS,
         SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
diff --git a/homeassistant/const.py b/homeassistant/const.py
index a6f39db8532..db0af10fba3 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -603,6 +603,7 @@ class UnitOfReactivePower(StrEnum):
     """Reactive power units."""
 
     VOLT_AMPERE_REACTIVE = "var"
+    KILO_VOLT_AMPERE_REACTIVE = "kvar"
 
 
 _DEPRECATED_POWER_VOLT_AMPERE_REACTIVE: Final = DeprecatedConstantEnum(