... installation 4.Anti-freez,No maintenance Balcony Solar Water Heater, Technical Parameters: Heat Pipe Solar Collector Spec.(mm) ... Aluminium alloy plate Accessories Workstation system, Electric heater, E-Parts box, thermostat, Switch, Anode magnesium bar, T/P valve ... , Relief valve Working Pressure 6.0 bar Hail Resistance Φ25mm Balcony solar water heater ...