... type of solar water heater can work in high pressure 5. It uses the heat pipe which can deliver the heat rapidly 6. ... year round in the cold climateDescriptionHeat Pipe Pressurized Solar Water Heater(compelete SUS304stainless steel )Material of out tank 0.31 ... 6 holes. Magnesium bar, T/P valve, , sensor hole, water inlet and outlet hole, electric heater. Pre-heat Solar Water Heater with Assiatant Tank