... , Western EuropeProduct DescriptionNon-pressure solar water heaterWorking Principle:Compact Non-pressure Solar Water Heater relies on desity of the water, cold water down, hot water up, a cosmical ... : 0°,25°, 38°, 45° 7. Reflector: stainless steel sheet or strip8. Daily efficiency: above 50%9. Optional electrical heater: 1.5kw/2kw ...