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Heat Pumps generate more
heat than the electricity they consume.
Here's how a heat pump works: It captures heat from outside and transfers it into your home. While it uses electricity to do this, the heat it brings into your home is much greater than the amount of electricity required to operate it. One great advantage of a heat pump is that it doesn't burn any fuel itself. Instead, it takes existing heat from the environment so it doesn't release any carbon dioxide.
In the case of an air source heat pump (ASHP), the process begins with the cold refrigerant in the outdoor unit (called an evaporator). This refrigerant absorbs heat from the air as it's blown across a heat exchanger using fans. Even though the air might be cold during winter, there's still a lot of heat energy in it due to the large volume of air passing over the heat exchanger.
Air source heat pumps extract the available heat in the air to heat your home and hot water. Heat can be extracted from air temperatures as low as -15C.
Ground source heat pumps extract heat from the ground and provide heat to your radiators , underfloor heating and hot water for your home.
A Ground Source Heat Pump (GSHP) operates similarly to an Air Source
Heat Pump (ASHP). However, a GSHP gathers heat energy from water
flowing through underground pipes.
This heated water, also called 'brine' and mixed with antifreeze, is then pumped to a heat exchanger inside the house. Within the heat exchanger, the warmth from the brine transfers to a refrigerant. This refrigerant travels through a compressor circuit, carrying the captured heat to use in the heating system.
Solar water heating systems, also known as solar thermal systems, harness the power of the sun to heat water. The heated water is stored in a hot water cylinder or a thermal store. Solar water heating systems use panels or tubes, called solar collectors, to gather solar energy.
The solar collectors convert the infrared portion of visible light into heat. They are filled with a mix of water and glycol. This fluid is pumped around a circuit, which passes through the hot water cylinder
Since the amount of sunlight changes throughout the year, these systems might not be able to provide all the hot water needed at all times. In such cases, a regular boiler or an immersion heater is usually used to fill in the gap and ensure a steady supply of hot water.
Solar hot water heating systems (solar thermal systems) use the free heat available from the sun to provide domestic hot water for your home.