Renewable Heating Incentive

UK regulations came into effect on 22 May 2018. The Domestic Renewable Heat Incentive (Domestic RHI) is a government financial incentive to promote the use of renewable heat. Switching to heating systems that use eligible energy sources can help the UK reduce its carbon emissions and meet its renewable energy targets.

People who join the scheme and stick to its rules receive quarterly payments for seven years for the amount of clean, green renewable heat it’s estimated their system produces.

To join the Domestic RHI, the property your renewable heating system is in must be capable of getting a domestic Energy Performance Certificate (EPC). The EPC is the proof that your property is assessed as a domestic ‘dwelling’. Without one, you won’t be able to apply and can’t join the scheme.

You can check to see if you have an existing EPC at your property for England and Wales, see the Landmark Register

  • You must install loft and/or cavity wall insulation if it’s recommended in your EPC
  • You must apply within 12 months of first commissioning

If you have these in compliance, then you are eligible.

Ground Source Heating

Ground Source is the best type of renewable heating currently available. The best for thermal sourcing, thermal stability through all seasons and the best for current tariffs (amount the government pays homeowners), double that of air source heat pumps and more than 3 times that of biomass boilers.

Jan – Mar 2020 6.88p 10.71p 20.89p 21.09p


Your payback will be determined by the outlay and running costs of which initial costs make up 95% of the total. Fontus Water, in line our water well business, offer the best value for drilling per meter in the UK and install only the best quality ground source heating systems for maximum life.

You may hear of 2 main types of “Ground Source (Loop) Systems”:

Vertical Ground Source Heating System: Fontus does boreholes, safe, fast and where space is limited, up to 150m deep. We also install filled piping (closed loop) or pump (open water loop), pressure test and lay right up to the ground source heat pump.

Horizontal Ground Source Heating Systems: No drilling, just digging. You need a fair amount of land and there’s significant ground disturbance. It’s also not as thermally efficient as vertical, as ground temperatures are still affected by air temperature to around 15 meters.


How do we work out how deep to drill?:

The ground and geothermal temperature varies across the UK primarily based on geology. Other factors such as groundwater and aquifer mobility, completion type and insulation are also included. We then calculate the entire ground gource collection system requirements specific for every job.


  • A house needs heat pump capacity of kW 10KW (Heating, average family 3-4 bed house with reasonable insulation)
    Energy yield per metre of active collector 50 kW
  • Collector length required is therefore 10,000/50 = 200 meters


Therefore recommend 2 x 100 meter boreholes

If you are interested in finding out more just contact us at