The quality of the material production of the solar water heater, tank pressure, temperature, anti-leakage and water quality impact. Domestic water tank used materials treated with preservatives or enamel, galvanized steel, rust-proof aluminum, the poison plastic or vacuum tube solar water heater, stainless steel plate steel plate. The thermal characteristics of the solar collector tank including the exothermic nature of the heating characteristics, insulation characteristics. The exothermic features is hope that the hot water tank can be put out to facilitate the use of. Household water tanks can be upright, into the cold water from the lower part of the top of the solar heating water outflow from the upper. The heating characteristics of the water is the upper most of the inside the tank to heat up, and then the lower part of the heat up slowly. Insulation characteristics refers to the speed of the water temperature drops, associated with the tank sealed, insulation materials, ambient temperature, the size of the water capacity.
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