Ground Source Heat Pumps
3 bedroom house
- Monthly: Savings*£25 + Goverment subsidy**£208 = Total savings £233
- Yearly: Savings*£300 + Goverment subsidy**£2500 = Total savings £2800
- 7 Years: Savings*£2100 + Goverment subsidy**£17500 = Total savings £19600
5 bedroom house
- Monthly: Savings*£38 + Goverment subsidy**£250 = Total savings £288
- Yearly: Savings*£450 + Goverment subsidy**£3000 = Total savings £3450
- 7 Years: Savings*£3150 + Goverment subsidy**£21000 = Total savings £24150
*Typical monthly/yearly/7 years savings for a 3/5-bedroom house switching from oil fired heating
**Typical amount received every month/year/7 years in RHI payments, for installing renewable heating in a 3/5-bedroom house.
Try our FREE online calculator, to see how much you can save!
How it Works
The purpose of a Ground Source Heat Pump (GSHP) is to absorb low grade heat in the ground and transport, concentrate and release it in your home where it can be used for space or water heating.
A heat pump works like a refrigerator in reverse. Instead of moving heat from the inside to the outside, the natural heat stored in the surface soil, ground rock or water source is moved into the house.
The ground absorbs low-grade heat from direct sunlight and rain, giving it year round temperature of between 8- 12°C.
When an anti-freeze mixture is pumped through the ground within an energy absorbing pipe, known as ground array, the anti-freeze circulating in the array is constantly warmed by the ground’s low-grade heat.
Having increased in temperature, the anti-freeze mixture returns to the heat pump, where the evaporator in the heat pump is used to extract the heat from the ground array. This is achieved through boiling the refrigerant (boils at -10°C), which turn into a gas that is then fed into the compressors.
The compressors increases the temperature of the gas to between 75°C - 125°C through an increase in pressure. This hot refrigerant gas then flows into a second heat exchanger called a condenser, where as the gas condenses the heat is passed into the heat exchanger which powers the central heating system and supplies the domestic hot water. Our ground source heat pumps increases the temperature from the ground by around four times – so if the ground temperature is 12°C, the output would be 48°C.
Having transferred its heat, the refrigerant gas reverts to a liquid. This liquid is passed through an expansion valve at the end of the cycle to reduce its pressure and temperature, ready to start the cycle all over again.
Different types of Collectors
Rock The heat pump collects stored solar energy from a collector, normally a hole drilled into the bedrock. This type of system requires little space and gives you a constant heat source all year round. It can be implemented in all building types: large or small, commercial or residential.
Surface soil In the summer months solar heat is stored in the soil. The heat pump collects this stored solar energy from a buried collector, known as a ground array. This is a popular and cost-effective type of collector, where the highest yields can be obtained from soil with high water content.
Lake /River If your home is next to a water source such as a lake, heat from the lake water can be extracted using a surface soil collector anchored to the bed of the lake.
Installing a ground source heat pump can save you £2,800 per year for an average 3 bedroom house. (Savings £300, Government subsidy £2,500). Choosing the right system to realise these savings is very complicated. That's where we come in!
Try our FREE online calculator, to see how much you can save