... solar water heater 1.corrosion resistance 2:Passed the certification CE,UL, 3.high quality ,5000 hours at least Cartridge heat pipe solar water ... heaterSpecification1:Be used for solar water heater2:110V~240V, 500W~3000W3 ... . Easy installation.Pls advise when inquiry:Heater model;Use environment and max temperature;Wattage ... Cartridge heat pipe solar water heater