... Heaters, solar energy heater,Solar Energy Water Heater, Solar Heat Collector, Hot Collector, Solar Water, pressuried solar heater,Solar ... Structure: porcelain enamel inner tank 6) Pressure: 0.6MPa 7) Heat preservation: 72h - 80h 8) Hail resistance: 25mm Excellent figure, ... the solar tubes and converted into heat2) Solar heat transfer: heat pipes conduct the heat from within the solar tube up to the ...