... Walter heater PCBA electronic controller / Solar water heater PCBA control board / Electronic water heater PCBA controlCHARACTERISTICS1. Clear display of water temperature, time, day ... heating.3. Control programs.4. Battery back up in event of power failure.5. Multiple protection functions, dry heat, ... Han control is a PCBA designer and PCBA manufacture in china, and can provide the PCBA design and ...