... Simple installation 4.Anti-freez,No maintenance Balcony Solar Water Heater, Technical Parameters: Heat Pipe Solar Collector Spec.(mm) ... 2.0mm Material Aluminium alloy plate Accessories Workstation system, Electric heater, E-Parts box, thermostat, Switch, Anode magnesium bar, ... water heating when less hot water presentsAccessories:1) Electrical heater, as an auxiliary heating element in case of ...