diff --git a/homeassistant/components/overkiz/climate/atlantic_electrical_heater_with_adjustable_temperature_setpoint.py b/homeassistant/components/overkiz/climate/atlantic_electrical_heater_with_adjustable_temperature_setpoint.py
index 041571f7b5f..709d93bb2b4 100644
--- a/homeassistant/components/overkiz/climate/atlantic_electrical_heater_with_adjustable_temperature_setpoint.py
+++ b/homeassistant/components/overkiz/climate/atlantic_electrical_heater_with_adjustable_temperature_setpoint.py
@@ -52,6 +52,7 @@ OVERKIZ_TO_HVAC_MODE: dict[str, HVACMode] = {
     OverkizCommandParam.OFF: HVACMode.OFF,
     OverkizCommandParam.AUTO: HVACMode.AUTO,
     OverkizCommandParam.BASIC: HVACMode.HEAT,
+    OverkizCommandParam.MANUAL: HVACMode.HEAT,
     OverkizCommandParam.STANDBY: HVACMode.OFF,
     OverkizCommandParam.EXTERNAL: HVACMode.AUTO,
     OverkizCommandParam.INTERNAL: HVACMode.AUTO,