vacuum tube solar water heater 1.CE ,ISO9001 2.5 years guarantee,15 years lifetime. ... 3.Delivery time:within 7 days Compact non-pressurized VACUUM TUBE SOLAR WATER HEATER Own factory support: Haining deno Solar equipment Co., Ltd ... be heated to be hot water-----Components: Main tank, vacuum tube, frame, Back up components: assistant tank; electrical heater; Mg bar, intelligent controller1 ...