When getting a heat pump, it’s important to choose the right one for you and your property. This can be a difficult decision, so here’s a comparison table with some things to consider.
|Ground source heat pump||Air source heat pump|
|Energy Efficiency||More energy efficient than air source pumps. 1 KWH in = 4 KWH of energy out||More efficient than boilers, but less efficient than a ground source heat pump.|
|Average cost||£10,000 - £18,000 (Most of this cost is related to installation, like digging and fitting the underground loop.)||£6,000 - £8,000|
|Installation process||Requires garden space that is suitable for digging. If you go for horizontal installation, you’ll need an area around 100 metres long and 1-2 metres deep. If you go for vertical installation, you’ll need an area around 100 metres deep and 20cm wide. Vertical installations require specialist equipment to drill a bore hole, and double the cost, more or less. Reasonably difficult to retrofit so more popular in new builds.||A lot easier to install than ground source pumps. Mounted on an outside wall or floor.|
|Potential £ savings||If you currently use an older, non-condensing oil boiler, you could save around £130 a year with a ground source heat pump. If you have an electric boiler, or storage heaters, your savings could reach £1,425 a year. (Source: UK Energy Saving Trust)||Up to £700 per year depending on your current system (Source: UK Energy Saving Trust)|
|Functions||Can only be used for heating||Can be used for heating and cooling|
|Maintenance||Servicing by either the owner or qualified installer||Servicing should be done by a technician once a year|
|Life Span||Ground source pipes have an estimated lifespan of 50 - 100 years, while the heat pump itself can run for 20 - 25 years.||Operational for up to 20 years, most come with a 5 year guarantee|
|Noise||Very quiet||Some noise - around 40 to 60 decibels|
|Grants available||Domestic Renewable Heat Incentive (RHI) ECO scheme - grant for retrofitting ground source heat pumps into social housing properties (Both can be used in conjunction)||Domestic Renewable Heat Incentive (RHI)|
|RHI payments over 7 years||£17,500 (Ofgem figures, Sept 2018)||£8,400 (Ofgem figures, Sept 2018)|
What else would you consider when deciding on a heat pump?