Air source technology has become increasingly popular because it is relatively easy and inexpensive to install. The heat pumps we install qualify for the government Renewable Heat Incentive (RHI) providing our customers with an income for many years.
An air to water heat pump is a similar size to a small air conditioning unit which is installed outside your property and works like a refrigerator, but in reverse. It takes energy from the air outside, concentrates it and uses that energy to heat and maintain a cylinder of hot water in your property. This hot water is then used for both space heating (radiators/underfloor heating) and hot running water (showers/taps). Our systems are complete boiler replacements units, there is no need for an auxiliary unit (back up LPG, oil or electric). As well as the low running costs of the heat pump, you are entitled to money back from the government on the RHI (Renewable Incentive Scheme).
The heat pump sends heat through a coil inside the hot water cylinder. Because the fluid that passes through this coil is very hot it heats all the water around it in the cylinder. This cylinder is heavily insulated with 40-50mm of insulation, so it acts as a thermal store holding the water at a useful temperature for days until it is required. If a hot water tap is turned on, the tank releases the hot water to satisfy demand. If the house temperature drops below the set temperature on the thermostat, then the thermostat calls for heat in the central heating circuit to bring the temperature back up.
Air to water source heat pumps run extremely efficiently. This is measured by their Co-efficiency of Performance (COP) and you must ensure the product you choose is tested in line with the government testing standard, EN14511.
Electrical heating for example works on a ratio of 1kWh of electric energy to transfer only 1kWh of energy to heat your house, a ratio of 1:1 (100%). For the average air to water source heat pump, every 1kWh of electricity you buy in is converted into 4kWh of heat, a ratio of 1:4 (400%). The ratio of this transfer is the Co-efficiency of Performance or COP. The average air to water source heat pump has a COP of 4 in comparison to electric heaters which typically have a COP of 1.