The use of evacuated tube solar water heater is a method of reducing the environmental heat loss inherent in the plate. Due to the inability of the heat loss due to convection to pass through the vacuum, an effective isolation mechanism is formed that can hold the heat inside the header. As a result of the fact that the strength of the two glass plates is not sufficient to withstand the vacuum, a vacuum is created between the two concentric tubes. Thus, in general, the water conduit in the evacuated tube solar water heater is surrounded by two concentric glass tubes, with a vacuum between the two glass tubes, the evacuated tube solar water heater absorbing heat from the sun (to heat the tube), but limiting the return of heat back to the environment. The inner tube is coated with a heat-absorbing agent. The lifetime of the evacuated tube solar water heater varies from 5 to 15 years depending on the collector.
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