... . 4.OEM solar water heater system solar water heater solar water heater is Thermosyphon solar water heater, That is a kind ... 3~5°C per dayOptional accessories: assistant tank, electric heater, reflector ,automatic inlet water valve, Magnesium anode, ect. ... from the air, only 1/4 electricity consumption of electrical water heater 2) Utilizing high efficiency, environment protecting working substance ...