This section provides a ground source heat pump design with schematic drawings, ground source heat pump installation costs compared to LPG, and a real-life case study and ground source heat pump reviews to showcase how a district ground source heat pump system fed by a borehole ground array can provide heating and hot water to multiple holiday accommodation buildings.

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Example: Schematic

For illustrative purposes only

Example: Project & Finances

Based on the above schematic, Kensa has calculated example costs below to illustrate the upfront finance required and the expected running costs and income generated via the Non-Domestic Renewable Heat Incentive (RHI) over a 20 year period (the duration of the Non Domestic RHI), compared to an LPG system. For a bespoke quote please click here.

Heat Pump Specification

System architectureMicro District
Total heat pump capacity515kW
Equipment typex103 units - Shoebox and Evo Mix
Design conditions0/40°C
Potable DHW temp60°C
Integral immersion heatersNo (DNO friendly)
Ground array typeBoreholes
Boreholes required*15,000mtrs
Land area requiredGroups of lodges fed by clusters of boreholes
*Boreholes based on average ground conductivity


Total Project Costs, Savings & Returns vs LPG

 Kensa Ground Source Heat Pump & Ground ArrayLPG Boiler
Lifetime Expectancy: ApplianceUp to 20 yearsUp to 10 years
Lifetime Expectancy: InfrastructureUp to 100 years-
Carbon Saved (over 20 years)5,000,000 tonnes0 tonnes
Appliance & Infrastructure Cost*£1.1m to £1.3m£100K
Running Costs (over 20 years)**£1.9m to £2.1m£2.3m to £2.6m
Servicing Costs (over 20 years)***£0K£2K
RHI Income (over 20 years)****£2m - £2.5mNot eligible
Net cost (after 20 years)*****£900K - £1m£2.4m - £2.7m
*Costs are for the supply and installation of the Kensa heat pump and ground array only, and the supply and installation of the LPG boiler equipment only. Costs for supply and installation of internals such as radiators, underfloor and heating controls are not included, please speak to your plumbing contractor. **Based on electric at 15p/kW/hr and COP of 3. Based on LPG at 40p a litre and 85% efficiency ***Ground source heat pumps have no requirement for annual maintenance. However, it is good practice for the heating distribution system to be proactively checked and maintained to ensure optimum performance. ****The NON-DOMESTIC RHI is a 20 year index linked funding stream which assumes inflation at 3%. *****Net cost for LPG does not include an additional LPG boiler, which will likely need to be  factored in during the 20 year comparison period due to the LPG’s 10 year average lifetime expectancy.

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Blog: Multiple buildings? Unlock Non Domestic RHI Funding

Homeowners and self-builders whose projects feature two or more domestic buildings on one site, could be earning themselves a profitable income by utilising a simple district ground source heat pump system architecture to unlock quarterly payments from the Government’s Non Domestic Renewable Heat Incentive (RHI) scheme for the next 20 years. More commonly associated with…