Purchase Notes: If you find that the electric water heater is not heating,the water temperature is not enough,it does not mean that the water heater is not working,because the temperature control of the water heater is controlled by the size of the water flow.Only the inlet water flow and inlet water temperature can change the water temperature.The greater the water flow, the lower the outlet water temperature.The higher the inlet water temperature, the higher the outlet water temperature and vice versa.