CWDR series electric hot water boilers adopt intelligent digital boiler computer controller, which has boiler outlet water temperature control, four-time timing operation, boiler water replenishment control, outlet and return water temperature detection, secondary return water electric regulating valve control, etc. Fault detection has complete protection functions such as water shortage protection, over-temperature protection, furnace shell over-temperature protection, pressure protection, etc., to ensure safe and stable operation of the boiler.