1.Split pressurized solar water heater 2.Solar heat pipe pressure collector ... 8-4848pcs58mm1800mm580mm700mm400 literHLD-SHP58/1.8-6060pcs58mm1800mm580mm700mm500 literSelective fitting: Electrical heater, magnesium bar.P.S.1. Controller can display ... the temperature, control circulation pump, control electrical heater.2. Electrical heater, which is backup fitting when it is rainy ...