... : 10,000 sets per month.Trademarket: HUIHAOApplication: Water HeaterType: Non-PressurePipe Material: GlassExport Markets: North ... Non-pressure Solar Water Heater relies on desity of the water, cold water down, hot water up, a cosmical ... physics, to circulat water through the ... Three target vacuum tube 2010 New vacuum tube solar water heater