Profitably balancing build costs with carbon compliance, conscience, and end-user running cost considerations can be a complex juggling act.
Thankfully Kensa’s use of Shared Ground Loop Arrays and split ownership funding mechanisms offer developers low-cost heating solutions comparable to conventional gas systems, with the added benefits of exceptional efficiencies, sustainable merit, and the lowest running costs and carbon emissions, mitigating the costs of meeting increasingly stringent carbon compliance building regulations.
The RHI income creates a 6-13% IRR for the developer or attracts external funders to own and operate the ground source heat pump infrastructure, removing the cost of the shared ground loop array from the housing association.
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.
Sunamp’s super-compact Heat Battery technology fits perfectly with the Shoebox heat pump to provide a clean, efficient and cost-effective thermal energy storage solution.
Kensa has partnered with leading cylinder manufacturer, Advance Appliances, to design and produce stainless steel mains pressure cylinders featuring enhanced surface area coils specifically for ground source heat pumps.
Renewable Heat Incentive (RHI)
Shared Ground Loop Arrays are eligible for 20 years of guaranteed quarterly payments via the Non Domestic RHI.
The 2018 RHI Regulations included an important refinement; for the first time, Non Domestic RHI quarterly payments for residential properties linked to Shared Ground Loop Arrays are now based upon the deemed heat consumption taken from the Energy Performance Certificate.
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.
Reduces capital costs (as meters are no longer needed) and eliminates all the administration burden linked to quarterly readings and submissions. More importantly, it has prompted funders to back Kensa Utilities’ offer of ground arrays at no charge to the house builder.
Eliminates the key barrier to deployment – the expense of the ground array – and allows Kensa to mimic long-standing ‘split ownership’ arrangements in the gas sector with the underground infrastructure owned and maintained separately from the 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.
Typical Project Costs
Financial illustration (new build site of 135 houses):
Based on Kensa’s fully funded ground arrays option.
Total Cost of Installation (Paid by developer)
Kensa Utilities Capital Contribution (RHI-linked)
Net Cost of Ground Source Heat Pumps & Cylinders*
*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.
2 year warranty for the controller and water pumps.
2 year internals warranty.
Extended warranties are available on request.
After Care & End Users
Property’s featuring Kensa’s Shared Ground Loop Arrays will provide end users with numerous unique benefits over traditional Heat Networks with minimal after care requirements:
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. Kensa’s ground source heat pump systems offer the lowest fuel costs.
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.
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.
Find out more about Kensa’s ground source heat pump solutions for private housing by clicking the links below:
Kensa’s Shared Ground Loop Arrays (SGLAs) are an award-winning and pioneering approach to District and Communal Heating without the drawbacks of traditional Heat Network systems. The unique 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…
This Kensa Contracting commissioned animation 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.
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