How much will a ground source heat pump with slinkies cost?

A single Kensa Evo ground source heat pump fed by a slinky ground array could cost in the region of £14,000 and £17,500, and earn between £24,000 and £28,000 income from the Domestic Renewable Heat Incentive (RHI).

The costed example below reviews how the costs and savings breakdown for a single building connected to slinkies serving a Kensa Evo Heat Pump compared to an LPG boiler alternative.

For more heat pump prices use our heat pump prices tool or online quote form here.

Example: Project & Finances

Kensa has calculated example costs to illustrate the upfront finance required for a Kensa ground source heat pump and slinkies, compared to an LPG system.

Expected running costs and Domestic Renewable Heat Incentive (RHI) income are also included.

For a bespoke quote please click here.

Heat Pump Specification

System architectureSingle heat pump
Heat pump capacity13kW
Equipment type13kW Evo
Design conditions0/40°C
Potable DHW temp60°C
Intregral immersion heatersNo (DNO friendly)
Ground array typeSlinkies
Slinkies requiredx4
Land area required1000sq/m


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 7 years)28 tonnes0 tonnes
Local NOx emissions*0kg NOx/y1.31kg NOx/y
Appliance & Infrastructure Cost**£14K to £17.5K£1.5K
Running Costs (over 7 years)***£9K to £11K£14K to £16K
Servicing Costs (over 7 years)****£0£700
Domestic RHI Income (over 7 years)*****£24K to £28KNot eligible
Net Cost (after 7 years)******£500 cost to £1K profit£16.2K to £18.2K cost


*NOx emissions based on 56mg/Kwh for gas and liquefied petroleum gas (LPG) boilers (1800 run hours) **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. *****DOMESTIC RHI is a 7 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.

Example: Schematic

For illustrative purposes only

Case study: Long Crook

The Young’s built a stunning five bedroom property in the picturesque Scottish Highlands featuring a 21kW Kensa Hybrid ground source heat pump with solar thermal to provide 100% of the property’s heating and hot water needs.

Key facts

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Longcrook Facility