The cost of an air source heat pump for a typical four bedroom property should be between £6,000 and £8,000. They are less expensive than ground source heat pumps because they do not need a ground loop which has to be buried in a trench in your garden.
This however, is reflected in the Domestic RHI tariff payable; 10.71 p/kWh for air source heat pumps compared to 20.89 p/kWh for ground source heat pumps.
Running costs include the cost of electricity required to operate the heat pump but this should not be much more than the cost of running the pump in a central heating system which uses LPG or heating oil.
An ideal set up for a domestic property would be an air source heat pump which provides space heating and solar thermal which provides domestic hot water.
Although householders can only apply for Domestic RHI tariffs for one space heating system they can make two applications if one is for a heat pump or a biomass boiler and the other is for a solar thermal water heating system for domestic hot water.