non pressure solar water heater with assistant tank We are a professional solar water heater manufacturer with ISO and CE certificate in Jiaxing, Zhejiang, China. Advantages: 1. Can he operated completely automatic if connect with intelligent solar controller. 2. Simple structure, easy plug-in installation, can be installed both on flat and inclined roof, and can be used with an auxiliary electric booster as to provide tot water without sunshine. 3. Superior heat preservation ensured by one-off molding polyurethane foam with thickness 50 65mm. 4. Suitable for camping area, holiday residences. 5. stable and reliable performance, well wind resistance. 6. Meet the mankind healthy bath standard: The material of inner tank is SUS304-2B stainless steel plate; the silica The details of material: Evacuated tube: High quality borosilicate glass 3.3, Φ47×1500, Φ58×1800 Inner tank: SUS304-2B stainless steel plateOuter tank: Enamel steel plate Insulating layer: Polyu