What do ground source heat pumps with slinkies cost?

In this example, four individual Kensa Evo ground source heat pumps inside four separate domestic buildings connected by a Shared Ground Loop Array of slinkies, could cost in the region of £56,000 and £72,000, and earn between £170,000 and £200,000 income from the Non Domestic Renewable Heat Incentive (RHI).

For more heat pump prices, call Kensa on 0845 680 4328.

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 architectureShared Ground Loop Array
Total heat pump capacity52kW
Equipment type4x 13kW Evo's
Design conditions0/40°C
Potable DHW temp60°C
Integral immersion heatersNo (DNO friendly)
Ground array typeSlinkies
Slinkies required14
Land area required3500sq/m


Total Project Costs, Savings & Returns vs LPG

 Kensa Shared Ground Loop Array & GSHPLPG Boiler
Lifetime Expectancy: ApplianceUp to 20 yearsUp to 10 years
Lifetime Expectancy: InfrastructureUp to 100 years-
Carbon Saved (over 20 years)300 tonnes0
Local NOx emissions*0kg NOx/y5.24kg NOx/y
Appliance & Infrastructure Cost**£56K to £72K£15K
Running Costs (over 20 years)***£115K to £135K£175K to £200K
Servicing Costs (over 20 years)****£0£2K
RHI Income (over 20 years)*****£170K to £200KNot eligible
Net cost excluding running & servicing (after 20 years)*****£114K to £128K profit£15K 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. *****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.

Example: Schematic

For illustrative purposes only