... .5 years guarantee 3. OEM service Compact Solar Water Heater with al-alloy bracketsDENO Compact Non-pressure solar water heaterFeatures:1. This ... doesn't need any power, green and economic.4. Easy install, easy operation, fashionable.5. Well wind, snow and hail resistance.6. 72 hours ... rising, As the thermosiphon principle, the hot water rise up, and arrive in the water tank, the cold water inside the ...