diff --git a/homeassistant/components/opentherm_gw/const.py b/homeassistant/components/opentherm_gw/const.py
index 65a684de224..74b856b4eaf 100644
--- a/homeassistant/components/opentherm_gw/const.py
+++ b/homeassistant/components/opentherm_gw/const.py
@@ -12,7 +12,7 @@ from homeassistant.const import (
     UnitOfPressure,
     UnitOfTemperature,
     UnitOfTime,
-    UnitOfVolume,
+    UnitOfVolumeFlowRate,
 )
 
 ATTR_GW_ID = "gateway_id"
@@ -310,8 +310,8 @@ SENSOR_INFO: dict[str, list] = {
         [gw_vars.BOILER, gw_vars.THERMOSTAT],
     ],
     gw_vars.DATA_DHW_FLOW_RATE: [
-        None,
-        f"{UnitOfVolume.LITERS}/{UnitOfTime.MINUTES}",
+        SensorDeviceClass.VOLUME_FLOW_RATE,
+        UnitOfVolumeFlowRate.LITERS_PER_MINUTE,
         "Hot Water Flow Rate {}",
         SENSOR_FLOAT_SUGGESTED_DISPLAY_PRECISION,
         [gw_vars.BOILER, gw_vars.THERMOSTAT],