diff --git a/homeassistant/components/stiebel_eltron/climate.py b/homeassistant/components/stiebel_eltron/climate.py
index 3b349713877..1aab76813ee 100644
--- a/homeassistant/components/stiebel_eltron/climate.py
+++ b/homeassistant/components/stiebel_eltron/climate.py
@@ -3,12 +3,11 @@ from __future__ import annotations
 
 import logging
 
-from homeassistant.components.climate import ClimateEntity, ClimateEntityFeature
+from homeassistant.components.climate import ClimateEntity
 from homeassistant.components.climate.const import (
-    HVAC_MODE_AUTO,
-    HVAC_MODE_HEAT,
-    HVAC_MODE_OFF,
     PRESET_ECO,
+    ClimateEntityFeature,
+    HVACMode,
 )
 from homeassistant.const import ATTR_TEMPERATURE, TEMP_CELSIUS
 from homeassistant.core import HomeAssistant
@@ -25,18 +24,18 @@ PRESET_DAY = "day"
 PRESET_SETBACK = "setback"
 PRESET_EMERGENCY = "emergency"
 
-SUPPORT_HVAC = [HVAC_MODE_AUTO, HVAC_MODE_HEAT, HVAC_MODE_OFF]
+SUPPORT_HVAC = [HVACMode.AUTO, HVACMode.HEAT, HVACMode.OFF]
 SUPPORT_PRESET = [PRESET_ECO, PRESET_DAY, PRESET_EMERGENCY, PRESET_SETBACK]
 
 # Mapping STIEBEL ELTRON states to homeassistant states/preset.
 STE_TO_HA_HVAC = {
-    "AUTOMATIC": HVAC_MODE_AUTO,
-    "MANUAL MODE": HVAC_MODE_HEAT,
-    "STANDBY": HVAC_MODE_AUTO,
-    "DAY MODE": HVAC_MODE_AUTO,
-    "SETBACK MODE": HVAC_MODE_AUTO,
-    "DHW": HVAC_MODE_OFF,
-    "EMERGENCY OPERATION": HVAC_MODE_AUTO,
+    "AUTOMATIC": HVACMode.AUTO,
+    "MANUAL MODE": HVACMode.HEAT,
+    "STANDBY": HVACMode.AUTO,
+    "DAY MODE": HVACMode.AUTO,
+    "SETBACK MODE": HVACMode.AUTO,
+    "DHW": HVACMode.OFF,
+    "EMERGENCY OPERATION": HVACMode.AUTO,
 }
 
 STE_TO_HA_PRESET = {
@@ -47,9 +46,9 @@ STE_TO_HA_PRESET = {
 }
 
 HA_TO_STE_HVAC = {
-    HVAC_MODE_AUTO: "AUTOMATIC",
-    HVAC_MODE_HEAT: "MANUAL MODE",
-    HVAC_MODE_OFF: "DHW",
+    HVACMode.AUTO: "AUTOMATIC",
+    HVACMode.HEAT: "MANUAL MODE",
+    HVACMode.OFF: "DHW",
 }
 
 HA_TO_STE_PRESET = {k: i for i, k in STE_TO_HA_PRESET.items()}
@@ -71,6 +70,7 @@ def setup_platform(
 class StiebelEltron(ClimateEntity):
     """Representation of a STIEBEL ELTRON heat pump."""
 
+    _attr_hvac_modes = SUPPORT_HVAC
     _attr_supported_features = (
         ClimateEntityFeature.TARGET_TEMPERATURE | ClimateEntityFeature.PRESET_MODE
     )
@@ -148,12 +148,7 @@ class StiebelEltron(ClimateEntity):
         return float(f"{self._current_humidity:.1f}")
 
     @property
-    def hvac_modes(self):
-        """List of the operation modes."""
-        return SUPPORT_HVAC
-
-    @property
-    def hvac_mode(self):
+    def hvac_mode(self) -> HVACMode | None:
         """Return current operation ie. heat, cool, idle."""
         return STE_TO_HA_HVAC.get(self._operation)
 
@@ -167,7 +162,7 @@ class StiebelEltron(ClimateEntity):
         """Return a list of available preset modes."""
         return SUPPORT_PRESET
 
-    def set_hvac_mode(self, hvac_mode):
+    def set_hvac_mode(self, hvac_mode: HVACMode) -> None:
         """Set new operation mode."""
         if self.preset_mode:
             return