Solar Heater, simple structure, easy plug-in installation, can be installed ... mankind healthy bath standard: The material of inner tank is SUS304-2B stainless steel plate; the silica gel ring sealing ... material:Evacuated tube: High quality borosilicate glass 3.3, Φ47×1500, Φ58×1800/2100, Φ70×2100Inner tank:SUS304-2B stainless steel ... 8330Ø58-1.8m25530027 / 7036Ø58-1.8m30636021 / 54 Solar Heater