... .5 years guarantee,15 years lifetime. 3. OEM service Compact SS Solar Water Heater high qualityDENO Compact Non-pressure solar water ... 't need any power, just under the sunshine. It is a green product.Specification:1. Water tank inner shell: 0.31 ... , reflector, Electrical heater, magnesium bar.P.S.1. Controller can display the temperature, water level, automatically water loading etc.2. Electrical ...