Solar geysers

The Energie thermodynamic geyser works with a heat exchange panel (thermodynamic panel) which heats a refrigerant. Because the refrigerant enters the panel at -20°C, the surrounding atmospheric temperature is enough to transfer energy to the refrigerant. This then returns to the geyser where it releases the energy to the water through a heat exchanger. There is a compressor which draws only 390W, compared to a conventional electric geyser which would draw between 2000W and 3000W. They are available in a 200l or 300l capacity.

The evacuated tube geysers (both low- and high-pressure) heat water directly from solar radiation and use no electricity. In low-pressure geysers, the main heating tank and glass tubes contains water which is fed in when the geyser is installed and is never drawn. This water remains in the tank and the glass tubes and heats up every day. The main water feed travels through a long thin, coil within the heating tank, slowly heating up to above 75°C as it travels over the 30m of piping inside the geyser. A low-wattage pump is required to boost water pressure when needed. In high-pressure geysers, the main tank contains the water which is drawn. The glass tubes contain metal elements which heat up as the incoming solar radiation heats the tubes. These elements then heat the water in the main tank, which is drawn out directly into the hot water line.