... thickness of heat insulation layer: 50mm to 60mm13. pressurized system: 0.6MP14, material of support: Aluminum Alloy15, ... resistance: -38 degree20, easy installation and best price pressurized solar water heater specification:1. Start fast, the heat absorbed can ... tap water system, working pressurized and automatically. 3. The water tank and heat pipe are solid sealed mechanically, water heater can ...