Offering ease of carbon compliance, by pairing Kensa’s ground source heat pumps with Shared Ground Loop Arrays (SGLAs), developments featuring as few as two dwellings, including flats, can also attract 20 years of quarterly payments through the Non Domestic Renewable Heat Incentive (RHI).

Split ownership of this innovative SGLA system architecture enables developers or external investors to fund and own the ground array and in return receive the RHI income for 20 years, whilst the new occupants retain ownership of the ground source heat pump system, enjoying low-cost and low-carbon heating in return.

Ground Source Review: Shropshire Rural Housing, Kinlet - Installation 2

What Are Shared Ground Loop Arrays?

Mimicking a traditional gas framework, Kensa’s innovative Shared Ground Loop Arrays link a series of collectors, typically boreholes, to multiple properties via an ambient temperature distribution system.

Each property then has an individual Kensa Shoebox heat pump wired to their own electricity supply, which upgrades the low temperature heat for heating and hot water within their dwelling.

Mimicking long-standing ‘split ownership’ arrangements in the gas sector, the underground infrastructure can be owned and maintained separately from the heat pump installed inside properties.

The advantages of this system configuration:

  • Qualify for 20 years of income via the Non Domestic RHI;
  • Split-ownership of ground arrays enables developers or investors to retain the RHI;
  • Exempt from Heat Network Metering & Billing Regulations;
  • Extremely low CO2 emissions enabling easy carbon and building regulations compliance;
  • No NOx, SOx or particulates emissions;
  • Lowest energy bills; slightly lower than mains gas, significantly lower than air source heat pumps, LPG & oil;
  • Householders able to switch energy suppliers, unlike other district heating;
  • No district heat losses;
  • Potential for free summer cooling;
  • Scalable and flexible district size can be deployed in sections as the development progresses;
  • Ultra-efficient and reliable.

Compared to various air source, direct electric, gas and CHP configurations in new build houses, shared ground loop arrays are the most efficient, lowest carbon, and lowest cost solution.

Greater London Authority (GLA), ‘Low Carbon Heat: Heat Pumps in London’ (September 2018)

Why Choose Shared Ground Loop Arrays?

Split Ownership SGLAs

The 2018 Renewable Heat Incentive (RHI) Regulations included an important refinement:  Non Domestic RHI quarterly payments for residential properties linked to shared ground loops are now based upon the deemed heat consumption taken from an Energy Performance Certificate (EPC).

This change has reduced capital costs (as meters are no longer needed) and eliminated all the administration burden linked to quarterly readings and submissions.

More importantly, it offers certainty of RHI income levels to provide developers with confidence in retaining ownership of the ground array in return for a guaranteed income through the RHI – alternatively developers could attract external investors to fund and own the ground arrays in return for the RHI, significantly reducing the developers cost of installing the ground source heat pump system.

Typical Project Costs

Financial illustration

Based on a small luxury new-build development of four houses:

Ground Source Heat Pumps & Shared Ground Loop Array (Slinkies)£56,000
RHI Income (Over 20 years)£114,000
View costed examples

End User Benefits

Property’s featuring Kensa’s Shared Ground Loop Arrays will provide end users with numerous unique benefits over traditional Heat Networks:

Lower fuel bills

GSHP’s produce 3-4kWh of heat energy for every 1kWh of electrical energy used, making them 300-400% efficient. Compare this to a typical boiler, which is just 90% efficient.

Lower emissions

Because a GSHP extracts so much “free” energy from the environment, this enables CO2  emissions to be lower than any other type of heating system.

Minimal maintenance

GSHP’s don’t require annual servicing or maintenance, and have an expected lifetime of 20 years.

Energy independence

With an individual ground source heat pump in each property, homeowners are in complete control of their own heating and energy bills, enabling easy energy tariff switching and payment only for their own heat consumption.

Download Purchaser's Guide

house purchasersFree cooling & no overheating

With heat being generated at the point of use (inside each dwelling) the ‘heat’ circulating the property is low temperature, therefore there are no heat losses from the system to contribute to overheating in risers and corridors. The low temperature system also allows for free passive cooling to be introduced, creating a comfortable living environment all year round.

Year round supply

1m below the surface the ground temperature remains a fairly constant 8-10°C all year round, ensuring your heat supply is constant and reliable; unlike air source heat pumps, which are impacted by external fluctuating air temperatures causing higher bills when heat is most needed.

Costed Examples

Small Developments

With Kensa’s Shared Ground Loop Array suiting as few as two connected properties, small luxury developments are increasingly turning to this cost-effective and energy efficient heating and hot water system.

View a typical costed example for four properties here.

View costed examples
Multiple domestic properties on shared ground arra

Bigger project?

Kensa Contracting can help!


Visit our sister site for larger scale costed examples and advice from the UK’s award-winning heat network delivery partners & contractors.
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