... solar water heater 1. 100L-1000L 2, CE/PED approved, high quality 3, OEM/ODM 4, Food material SUS304/316L Heat pipe ... .0 mm thickness SUS304 stainless steelTank insulating layer40mm 45kg/m³ high-density polyurethane foamedInlet and outlet holeMale G3/4Max pressure0.6 ... .875 m²Working stationSP106, SP116,SR962 working stationHeat exchanger length18m High Quality of China Heat Pipe Solar Water Heater