First: solar thermal water heaters (often just called solar water heaters) operate by absorbing sunlight into insulated (by vacuum) glass tubes where it turns into heat. That heat accumulates in the water until it becomes adequately hot. The hot water is stored in a tank. Apart from that, the heater was said to be equipped with a built-in auxiliary electric heater to ensure that hot water is always available, regardless of weather or time. That electric heating element was never plugged in, and the heater has been providing hot water even on cloudy days! This is made possible by the simple, yet amazing technology of insulation. The heater heats the water during the day, and insulation keeps the water hot throughout the day. It paid for itself in one year because it reduced the monthly electricity cost. That is what the previous 1980s heater cost, and it provided less hot water! (it was 20 gallons)
Vacuum tubes assimilate the advanced 12 years of spattering deposition of trivalent element technology, high borosilicate glass, gradual change of SS-C/CU selective complex absorptive coating. And these make vacuum tubes have high performance of absorptance and low reflection ratio. Through the interlayer, vacuum has a unique effect of thermo, with its temperature up to 380° C of idle sunning, performing a strong heating ability.
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Advantages of VTS:
Higher temp. than FPC system.
Get quick result in rainy & cloudy atmosphere.
No need to service for long time
Easy to get temp. In hard water.
VTS is widely accepted in cold countries.
VTS is cheaper than FPC system.
No clogging / choking