Pond mats

How much will ground source heat pumps with pond mats cost for multiple properties?

Four individual Kensa Evo ground source heat pumps inside four separate domestic buildings connected by a Shared Ground Loop Array of pond mats, could cost in the region of £52,000 to £64,000, and earn between £170,000 and £200,000 income from the Non Domestic Renewable Heat Incentive (RHI).

The costed example below reviews how the costs and savings breakdown for a small project of four properties featuring a Shared Ground Loop Array of pond mats serving Kensa Evo Heat Pumps compared to an LPG boiler alternative.

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Example: Project & Finances

Kensa has calculated example costs to illustrate the upfront finance required for Shared Ground Loop Arrays featuring pond mats connected to Evo heat pumps in a small development of four houses, compared to an LPG system.

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

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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 typePond mats
Pond mats required14
Lake surface area - no flow3500sq/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 tonnes
Local NOx emissions (Annual)*0kg NOx/y5.24kg NOx/y
Appliance & Infrastructure Cost**£52K to £64K£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)*****£118K to £136K 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

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