Compact Unpressurized Solar Water Heater

Working principle

Solar vacuum tube was evacuated into the tank , the coating inside of tube can absorb more than 92% heat energy from sunshine . Thecold water in water tank flows into the tube and become hot , because of different density between cold and hot water , there will be a natural

Circulation in the tube, hot water will float back to tank . 50mm thickness heat insulation layer by polyurethane between inner tank and outer tank can keep the

temperature of hot water for about 2 days without any sunshine , consumer can enjoy comfortable bathe anytime!

How solar water heater works 1. Solar water heater of all glass evacuated tube collector integrated with storage tank, are ideal for use in houses and other applications where cheap, reliable hot water supply is required. They are simple, economic and practical. 2.

As the specific gravities of hot water and cold water are different, cold water goes downward and hot water goes upward. 3. When cold water in evacuated tubes is heated, it becaomes lighter and goes to the water tank, while cold water in the tank goes down to the evacuated tubes. 4.

Through this circulation, the cold water in the water tank will be gradually heated.

Solar water heater features 1. Cheap and reliable solution, Simple structure, Easy installation 2. High efficiency 3. Withstands water pressure no more than 0.1MPa 4. Operated without any power supplying 5. Electric heater can be used as back up in rainy days 6. Hot water can be used directly, or can be used as a pre-heated

Solar water heater optional accessories 1. Assistant tank: 3/5/8/10/12/15/20L 2. Controller 3. Electrical heater: 1.5/2/2.5kw

Solar water heater specification:

Description solar water heater Material of out tank 0.31mm thickness color steel/ fluorine carbon steel Material of inner tank Food grade 0.41mm thickness SUS304 stainless steel Tank insulating layer 55mm 45kg/m³ high-density polyurethane foamed Inlet and outlet hole Male G 1/2, 3/4 Max pressure 0.05 Mpa Solar collector tube 3.3 Borosilicate glass with N/Al coating Thickness of glass tube 1.6 mm Vacuum tube tightness P≤0.005 Pa Absorption as=0.93-0.96(AM1.5) Emission ratio εh=0.04-0.06(80C±5C) Idle sunning property parameters Y=220~260m2.C/KW Average heat loss coefficient ULT=0.6~0.7W/(m2.C) Bracket: 2.0mm thickness aluminum alloy frame Structure of tank: 5 holes for air vent,overflow,water inlet and outlet,electric heater Welding: Argon arc welding Fastening pieces: Made of stainless steel screw Absorber area Tube quantity 58x1,800mm Tank capacity 80L-360L