diff --git a/homeassistant/components/opentherm_gw/button.py b/homeassistant/components/opentherm_gw/button.py
index efd4198aa943..d40e36450e41 100644
--- a/homeassistant/components/opentherm_gw/button.py
+++ b/homeassistant/components/opentherm_gw/button.py
@@ -18,6 +18,7 @@ from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 
 from . import OpenThermGatewayHub
 from .const import (
+    BOILER_DEVICE_DESCRIPTION,
     DATA_GATEWAYS,
     DATA_OPENTHERM_GW,
     GATEWAY_DEVICE_DESCRIPTION,
@@ -42,10 +43,17 @@ BUTTON_DESCRIPTIONS: tuple[OpenThermButtonEntityDescription, ...] = (
         device_description=THERMOSTAT_DEVICE_DESCRIPTION,
         action=lambda hub: hub.set_room_setpoint(0),
     ),
+    OpenThermButtonEntityDescription(
+        key="hot_water_push",
+        translation_key="hot_water_push",
+        device_description=BOILER_DEVICE_DESCRIPTION,
+        action=lambda hub: hub.gateway.set_hot_water_ovrd("P"),
+    ),
     OpenThermButtonEntityDescription(
         key="restart_button",
         device_class=ButtonDeviceClass.RESTART,
         device_description=GATEWAY_DEVICE_DESCRIPTION,
+        entity_category=EntityCategory.CONFIG,
         action=lambda hub: hub.gateway.set_mode(gw_vars.OTGW_MODE_RESET),
     ),
 )
@@ -67,7 +75,6 @@ async def async_setup_entry(
 class OpenThermButton(OpenThermEntity, ButtonEntity):
     """Representation of an OpenTherm button."""
 
-    _attr_entity_category = EntityCategory.CONFIG
     entity_description: OpenThermButtonEntityDescription
 
     @override
diff --git a/homeassistant/components/opentherm_gw/strings.json b/homeassistant/components/opentherm_gw/strings.json
index 7b6ee70e3c62..3af738b9803b 100644
--- a/homeassistant/components/opentherm_gw/strings.json
+++ b/homeassistant/components/opentherm_gw/strings.json
@@ -160,6 +160,9 @@
     "button": {
       "cancel_room_setpoint_override": {
         "name": "Cancel room setpoint override"
+      },
+      "hot_water_push": {
+        "name": "Heat hot water once"
       }
     },
     "select": {
diff --git a/tests/components/opentherm_gw/test_button.py b/tests/components/opentherm_gw/test_button.py
index 71e453789a88..cd252c7a2b8f 100644
--- a/tests/components/opentherm_gw/test_button.py
+++ b/tests/components/opentherm_gw/test_button.py
@@ -50,6 +50,40 @@ async def test_cancel_room_setpoint_override_button(
     mock_pyotgw.return_value.set_target_temp.assert_awaited_once_with(0, True)
 
 
+async def test_hot_water_push_button(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    mock_config_entry: MockConfigEntry,
+    mock_pyotgw: MagicMock,
+) -> None:
+    """Test hot water push button."""
+
+    mock_pyotgw.return_value.set_hot_water_ovrd = AsyncMock(return_value="P")
+    mock_config_entry.add_to_hass(hass)
+
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert (
+        button_entity_id := entity_registry.async_get_entity_id(
+            BUTTON_DOMAIN,
+            DOMAIN,
+            f"{mock_config_entry.data[CONF_ID]}-{OpenThermDeviceIdentifier.BOILER}-hot_water_push",
+        )
+    ) is not None
+
+    await hass.services.async_call(
+        BUTTON_DOMAIN,
+        SERVICE_PRESS,
+        {
+            ATTR_ENTITY_ID: button_entity_id,
+        },
+        blocking=True,
+    )
+
+    mock_pyotgw.return_value.set_hot_water_ovrd.assert_awaited_once_with("P")
+
+
 async def test_restart_button(
     hass: HomeAssistant,
     entity_registry: er.EntityRegistry,