diff --git a/homeassistant/components/mqtt/climate.py b/homeassistant/components/mqtt/climate.py
index f29a114620a..f45d2852df0 100644
--- a/homeassistant/components/mqtt/climate.py
+++ b/homeassistant/components/mqtt/climate.py
@@ -64,6 +64,8 @@ from .const import (
     CONF_MODE_LIST,
     CONF_MODE_STATE_TEMPLATE,
     CONF_MODE_STATE_TOPIC,
+    CONF_POWER_COMMAND_TEMPLATE,
+    CONF_POWER_COMMAND_TOPIC,
     CONF_PRECISION,
     CONF_QOS,
     CONF_RETAIN,
@@ -113,9 +115,6 @@ CONF_HUMIDITY_MIN = "min_humidity"
 # was removed in HA Core 2023.8
 CONF_POWER_STATE_TEMPLATE = "power_state_template"
 CONF_POWER_STATE_TOPIC = "power_state_topic"
-
-CONF_POWER_COMMAND_TOPIC = "power_command_topic"
-CONF_POWER_COMMAND_TEMPLATE = "power_command_template"
 CONF_PRESET_MODE_STATE_TOPIC = "preset_mode_state_topic"
 CONF_PRESET_MODE_COMMAND_TOPIC = "preset_mode_command_topic"
 CONF_PRESET_MODE_VALUE_TEMPLATE = "preset_mode_value_template"
diff --git a/homeassistant/components/mqtt/const.py b/homeassistant/components/mqtt/const.py
index fb1989069af..fcdfeb4bd7d 100644
--- a/homeassistant/components/mqtt/const.py
+++ b/homeassistant/components/mqtt/const.py
@@ -40,6 +40,8 @@ CONF_MODE_COMMAND_TOPIC = "mode_command_topic"
 CONF_MODE_LIST = "modes"
 CONF_MODE_STATE_TEMPLATE = "mode_state_template"
 CONF_MODE_STATE_TOPIC = "mode_state_topic"
+CONF_POWER_COMMAND_TOPIC = "power_command_topic"
+CONF_POWER_COMMAND_TEMPLATE = "power_command_template"
 CONF_PRECISION = "precision"
 CONF_TEMP_COMMAND_TEMPLATE = "temperature_command_template"
 CONF_TEMP_COMMAND_TOPIC = "temperature_command_topic"
diff --git a/homeassistant/components/mqtt/water_heater.py b/homeassistant/components/mqtt/water_heater.py
index 17e9430dba3..08b9d36d850 100644
--- a/homeassistant/components/mqtt/water_heater.py
+++ b/homeassistant/components/mqtt/water_heater.py
@@ -51,6 +51,8 @@ from .const import (
     CONF_MODE_LIST,
     CONF_MODE_STATE_TEMPLATE,
     CONF_MODE_STATE_TOPIC,
+    CONF_POWER_COMMAND_TEMPLATE,
+    CONF_POWER_COMMAND_TOPIC,
     CONF_PRECISION,
     CONF_RETAIN,
     CONF_TEMP_COMMAND_TEMPLATE,
@@ -91,6 +93,7 @@ VALUE_TEMPLATE_KEYS = (
 COMMAND_TEMPLATE_KEYS = {
     CONF_MODE_COMMAND_TEMPLATE,
     CONF_TEMP_COMMAND_TEMPLATE,
+    CONF_POWER_COMMAND_TEMPLATE,
 }
 
 
@@ -98,6 +101,7 @@ TOPIC_KEYS = (
     CONF_CURRENT_TEMP_TOPIC,
     CONF_MODE_COMMAND_TOPIC,
     CONF_MODE_STATE_TOPIC,
+    CONF_POWER_COMMAND_TOPIC,
     CONF_TEMP_COMMAND_TOPIC,
     CONF_TEMP_STATE_TOPIC,
 )
@@ -127,6 +131,8 @@ _PLATFORM_SCHEMA_BASE = MQTT_BASE_SCHEMA.extend(
         vol.Optional(CONF_OPTIMISTIC, default=DEFAULT_OPTIMISTIC): cv.boolean,
         vol.Optional(CONF_PAYLOAD_ON, default="ON"): cv.string,
         vol.Optional(CONF_PAYLOAD_OFF, default="OFF"): cv.string,
+        vol.Optional(CONF_POWER_COMMAND_TOPIC): valid_publish_topic,
+        vol.Optional(CONF_POWER_COMMAND_TEMPLATE): cv.template,
         vol.Optional(CONF_PRECISION): vol.In(
             [PRECISION_TENTHS, PRECISION_HALVES, PRECISION_WHOLE]
         ),
@@ -266,6 +272,9 @@ class MqttWaterHeater(MqttTemperatureControlEntity, WaterHeaterEntity):
         ):
             support |= WaterHeaterEntityFeature.OPERATION_MODE
 
+        if self._topic[CONF_POWER_COMMAND_TOPIC] is not None:
+            support |= WaterHeaterEntityFeature.ON_OFF
+
         self._attr_supported_features = support
 
     def _prepare_subscribe_topics(self) -> None:
@@ -317,3 +326,19 @@ class MqttWaterHeater(MqttTemperatureControlEntity, WaterHeaterEntity):
         if self._optimistic or self._topic[CONF_MODE_STATE_TOPIC] is None:
             self._attr_current_operation = operation_mode
             self.async_write_ha_state()
+
+    async def async_turn_on(self, **kwargs: Any) -> None:
+        """Turn the entity on."""
+        if CONF_POWER_COMMAND_TOPIC in self._config:
+            mqtt_payload = self._command_templates[CONF_POWER_COMMAND_TEMPLATE](
+                self._config[CONF_PAYLOAD_ON]
+            )
+            await self._publish(CONF_POWER_COMMAND_TOPIC, mqtt_payload)
+
+    async def async_turn_off(self, **kwargs: Any) -> None:
+        """Turn the entity off."""
+        if CONF_POWER_COMMAND_TOPIC in self._config:
+            mqtt_payload = self._command_templates[CONF_POWER_COMMAND_TEMPLATE](
+                self._config[CONF_PAYLOAD_OFF]
+            )
+            await self._publish(CONF_POWER_COMMAND_TOPIC, mqtt_payload)
diff --git a/tests/components/mqtt/test_water_heater.py b/tests/components/mqtt/test_water_heater.py
index c4f798e05ec..245af5c6918 100644
--- a/tests/components/mqtt/test_water_heater.py
+++ b/tests/components/mqtt/test_water_heater.py
@@ -257,6 +257,91 @@ async def test_set_operation_optimistic(
     assert state.state == "performance"
 
 
+@pytest.mark.parametrize(
+    "hass_config",
+    [
+        help_custom_config(
+            water_heater.DOMAIN,
+            DEFAULT_CONFIG,
+            ({"power_command_topic": "power-command"},),
+        )
+    ],
+)
+async def test_set_operation_with_power_command(
+    hass: HomeAssistant, mqtt_mock_entry: MqttMockHAClientGenerator
+) -> None:
+    """Test setting of new operation mode with power command enabled."""
+    mqtt_mock = await mqtt_mock_entry()
+
+    state = hass.states.get(ENTITY_WATER_HEATER)
+    assert state.state == "off"
+    await common.async_set_operation_mode(hass, "electric", ENTITY_WATER_HEATER)
+    state = hass.states.get(ENTITY_WATER_HEATER)
+    assert state.state == "electric"
+    mqtt_mock.async_publish.assert_has_calls([call("mode-topic", "electric", 0, False)])
+    mqtt_mock.async_publish.reset_mock()
+
+    await common.async_set_operation_mode(hass, "off", ENTITY_WATER_HEATER)
+    state = hass.states.get(ENTITY_WATER_HEATER)
+    assert state.state == "off"
+    mqtt_mock.async_publish.assert_has_calls([call("mode-topic", "off", 0, False)])
+    mqtt_mock.async_publish.reset_mock()
+
+    await common.async_turn_on(hass, ENTITY_WATER_HEATER)
+    # the water heater is not updated optimistically as this is not supported
+    mqtt_mock.async_publish.assert_has_calls([call("power-command", "ON", 0, False)])
+    mqtt_mock.async_publish.reset_mock()
+
+    await common.async_turn_off(hass, ENTITY_WATER_HEATER)
+    mqtt_mock.async_publish.assert_has_calls([call("power-command", "OFF", 0, False)])
+    mqtt_mock.async_publish.reset_mock()
+
+
+@pytest.mark.parametrize(
+    "hass_config",
+    [
+        help_custom_config(
+            water_heater.DOMAIN,
+            DEFAULT_CONFIG,
+            ({"power_command_topic": "power-command", "optimistic": True},),
+        )
+    ],
+)
+async def test_turn_on_and_off_optimistic_with_power_command(
+    hass: HomeAssistant, mqtt_mock_entry: MqttMockHAClientGenerator
+) -> None:
+    """Test setting of turn on/off with power command enabled."""
+    mqtt_mock = await mqtt_mock_entry()
+
+    state = hass.states.get(ENTITY_WATER_HEATER)
+    assert state.state == "off"
+    await common.async_set_operation_mode(hass, "electric", ENTITY_WATER_HEATER)
+    state = hass.states.get(ENTITY_WATER_HEATER)
+    assert state.state == "electric"
+    mqtt_mock.async_publish.assert_has_calls([call("mode-topic", "electric", 0, False)])
+    mqtt_mock.async_publish.reset_mock()
+    await common.async_set_operation_mode(hass, "off", ENTITY_WATER_HEATER)
+    state = hass.states.get(ENTITY_WATER_HEATER)
+    assert state.state == "off"
+
+    await common.async_turn_on(hass, ENTITY_WATER_HEATER)
+    # the water heater is not updated optimistically as this is not supported
+    state = hass.states.get(ENTITY_WATER_HEATER)
+    assert state.state == "off"
+    mqtt_mock.async_publish.assert_has_calls([call("power-command", "ON", 0, False)])
+    mqtt_mock.async_publish.reset_mock()
+
+    await common.async_set_operation_mode(hass, "gas", ENTITY_WATER_HEATER)
+    state = hass.states.get(ENTITY_WATER_HEATER)
+    assert state.state == "gas"
+    await common.async_turn_off(hass, ENTITY_WATER_HEATER)
+    # the water heater is not updated optimistically as this is not supported
+    state = hass.states.get(ENTITY_WATER_HEATER)
+    assert state.state == "gas"
+    mqtt_mock.async_publish.assert_has_calls([call("power-command", "OFF", 0, False)])
+    mqtt_mock.async_publish.reset_mock()
+
+
 @pytest.mark.parametrize("hass_config", [DEFAULT_CONFIG])
 async def test_set_target_temperature(
     hass: HomeAssistant, mqtt_mock_entry: MqttMockHAClientGenerator
@@ -509,9 +594,11 @@ async def test_get_with_templates(
                     "name": "test",
                     "mode_command_topic": "mode-topic",
                     "temperature_command_topic": "temperature-topic",
+                    "power_command_topic": "power-topic",
                     # Create simple templates
                     "mode_command_template": "mode: {{ value }}",
                     "temperature_command_template": "temp: {{ value }}",
+                    "power_command_template": "pwr: {{ value }}",
                 }
             }
         }
@@ -544,6 +631,14 @@ async def test_set_and_templates(
     state = hass.states.get(ENTITY_WATER_HEATER)
     assert state.attributes.get("temperature") == 107
 
+    # Power
+    await common.async_turn_on(hass, entity_id=ENTITY_WATER_HEATER)
+    mqtt_mock.async_publish.assert_called_once_with("power-topic", "pwr: ON", 0, False)
+    mqtt_mock.async_publish.reset_mock()
+    await common.async_turn_off(hass, entity_id=ENTITY_WATER_HEATER)
+    mqtt_mock.async_publish.assert_called_once_with("power-topic", "pwr: OFF", 0, False)
+    mqtt_mock.async_publish.reset_mock()
+
 
 @pytest.mark.parametrize(
     "hass_config",
@@ -1047,6 +1142,20 @@ async def test_precision_whole(
             20.1,
             "temperature_command_template",
         ),
+        (
+            water_heater.SERVICE_TURN_ON,
+            "power_command_topic",
+            {},
+            "ON",
+            "power_command_template",
+        ),
+        (
+            water_heater.SERVICE_TURN_OFF,
+            "power_command_topic",
+            {},
+            "OFF",
+            "power_command_template",
+        ),
     ],
 )
 async def test_publishing_with_custom_encoding(