Deno Compact Non-pressurized Solar Water Heater with high quality 1. CE ,ISO CCC 2. 5 years ... wind, snow and hail resistance.6. 72 hours heat preservation.Working Principle:This system uses the thermosiphon principle, Solar ... literDENO1800-CNP3636pcs58mm1800mm360mm470mm300 literSelective fitting: Controller, reflector, Electrical heater, magnesium bar.P.S.1. Controller can display the temperature, ...