By pairing Kensa’s Shoebox heat pumps with Shared Ground Loop Arrays, developments featuring as few as two dwellings, including flats, can attract 20 years of quarterly payments through the Non Domestic Renewable Heat Incentive (RHI), creating a 6-13% IRR for the developer or attracting external funders to own and operate the ground source heat pump infrastructure, removing the cost of the shared ground loop array from the house builder.
What Are Shared Ground Loop Arrays?
Mimicking a traditional gas framework, Kensa’s innovative Shared Ground Loop Arrays link a series of 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.
The advantages of this system configuration:
- Qualify for 20 years of income via the Non Domestic RHI;
- Split-ownership of ground arrays provides a funded option;
- 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.
Why Choose Shared Ground Loop Arrays?
Funded Ground Arrays
The 2018 RHI Regulations included an important refinement. For the first time, non-domestic RHI quarterly payments for residential properties linked to shared ground loops would be based upon the deemed heat consumption taken from the Energy Performance Certificate. This change reduced capital costs (as meters were no longer needed) and eliminated all the administration burden linked to quarterly readings and submissions. More importantly, it prompted funders to back Kensa Utilities’ offer of ground arrays at no charge to the developer. This change eliminated the key barrier to deployment – the expense of the ground array – and allowed Kensa to mimic long-standing ‘split ownership’ arrangements in the gas sector with the underground infrastructure owned and maintained separately from heat pump installed inside the properties. Kensa’s model sees the house builder fund the heat pump (which is sold with the property and maintained by the purchaser) whilst the ground array is fully funded.
By introducing deemed payments for the Non Domestic RHI and allowing ‘split ownership’, Government has created a significant catalyst for energy efficient new build developments featuring Shared Ground Loop Arrays, with costs no longer borne by the house builder.
Financial illustration (new build site of 85 mixed properties):
|Typical ground array cost (Paid by developer)||£369,750|
|Ground array buy-back (On property completion)||£403,028|
|Cost of ground source heat pumps & cylinders||£287,342*|
*Avoided costs should be subtracted from this figure. The deduction or counterfactual will depend on what system is being avoided but will include items such as boilers, cylinders, oil/gas tanks & pipework. It could also include savings in the fabric build cost as heat pumps improve emissions.
Kensa's Funding Mechanism
The below outlines the mechanism for developers and property owners wishing to utilise Kensa’s fully-funded Shared Ground Loop Arrays:
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.
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.
GSHP’s don’t require annual servicing or maintenance, and have an expected lifetime of 20 years.
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
Free 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.
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.
Click the below link to view a typical costed example for four properties.
View Costed Examples
For projects with larger numbers of properties, be these flats, apartments or houses, Kensa’s Shared Ground Loop Array offers an infinitely scalable solution.
Click the below link to view a typical costed example for a large scale housing development and moderate apartment block.
View Costed Examples
Kensa’s Shared Ground Loop Arrays (SGLS) are an award-winning and pioneering approach to District and Communal Heating without the drawbacks of traditional Heat Network systems. The design allows property owners and developers of two or more dwellings to realise the full potential of ground source heat pumps and receive Non Domestic Renewable Heat Incentive (RHI)…
The Non Domestic Renewable Heat Incentive (RHI) compensates for the additional cost of installing ground source heat pumps, compared to fossil fuel systems, in commercial and ‘district’ heating applications, notably Shared Ground Loop Arrays with ground source heat pumps. The Non Domestic Renewable Heat Incentive (RHI) provides a long term rate of return and fast payback…
Discover Kensa’s award-winning Shoebox ground source heat pump series, featuring the world’s smallest & quietest ground source heat pump.
This Kensa commissioned motion graphic depicts the key stages for the installation of Kensa Shoebox ground source heat pumps into individual flats in tower blocks, connected to shared ground loop array boreholes. For more information on this application click here.
The summer of 2018 ranks as one of the hottest on record. We are not complaining, it’s been lovely, but overheating is certainly an issue that needs to be faced when looking at the design of multiple occupancy buildings.
How to be carbon compliant for less GLA heat pumps report identifies shared ground loop arrays with individual ground source heat pumps as the lowest carbon & lowest cost solution for heating new builds Carbon pollution must be reduced to zero by 2050 to limit global warming At the same time house building to increase…
How innovative heating systems can combat climate change & local air pollution In light of Government’s Clean Air Strategy, the city of London’s Cleaner Heat Cashback scheme, and the Royal College of General Practitioners announcing they are to cease investment in the oil and gas sector due to its impact on climate change, air quality, and health,…
A landmark luxury housing development comprising forty apartments and houses currently under construction amongst the famous dunes of Perranporth beach in Cornwall is using pioneering architecture and sustainable development to breathe new life into a former derelict hotel site. Follow the blog View the infographic Watch the video “The Dunes”, set for completion in June…
Download Kensa’s two-page guide to funded Shared Ground Loop Arrays in new build developments, including funded project examples and details of the funding mechanism.
Download a short guide to ground source heat pumps for purchasers of new build developments, including benefits and costed examples.