Solar water heaters are
manufactured as pressure and non-pressure models. The pressure model is also
known as high-pressure solar heaters. The high-pressure solar heater means
water in the tank is under high pressure which is equal to the pressure of tap
water. Non-pressure model is also known as normal pressure solar heater which
means, water in the tank is under low pressure and is equal to the gravity of
the water.
Normal Pressure Solar Water
Heater
Vacuum glass tubes connected
directly into the tank with a small holding tank on top of it. The normal
pressure gravity system consists of a vacuum glass tube collector, an insulated
storage tank and optional stand parts. The evacuated glass tubes are filled
with water and exposed to the sun, thus heating up the water in the glass
tubes.
High Pressure Solar Water Heater
An enclosed heating unit
containing copper tubes connected indirectly to a tank. The tank may be located
next to the heating unit or separately such as under the roof. The
high-pressure solar water heating system features evacuated tubes and heat
pipes. The evacuated tube absorbs sunlight and converts it into heat energy,
this energy is then used in the process of heating water. There is no direct
connection between the heating fluids in the copper tubes and the water being
heated.
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