An renewable energy-based water heater is a popular system used for heating water using natural energy from the sun. Unlike conventional solar water heater water heaters, vacuum-sealed tube solar water heaters utilize a series of evacuated glass tubes to collect and transfer heat from the generous sun.
The state-of-the-art evacuated tubes consist of a translucent glass tube fully removed of air to absorb maximum heat from the absorbing radiation of the sun.
The most notable feature of energy-efficient evacuated tube solar water heaters is their outstanding performance compared to non-evacuated solar water heaters. Evacuated tubes can retain and exceed a higher temperature at the collector's surface and maintain a higher performance level over time. They are effective even cold and sometimes cloudy climates and can work at temperatures as low as 10°C.
However, the initial investment cost of a sustainable water heater is usually higher compared to other types of solar water heaters.
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