Social Housing New Build Boreholes

This section illustrates the costs of installing Kensa ground source heat pump heating and hot water systems in 85 new-build social housing properties. The scheme features an individual Kensa Shoebox Heat Pump in each house, connected to a Shared Ground Loop Array of boreholes.

We have provided a ground source heat pump design with schematic drawings and ground source heat pump installation costs for both self-financed and funded split ownership shared ground loop array options versus a mains gas boiler alternative.

Ground Source Review: South Western Housing, Tuckers Close - Exterior of affordable homes

Example: Finances

Based on the above schematic, Kensa has calculated example costs below to illustrate the upfront finance required for self-financed and funded split ownership Shared Ground Loop Arrays in large housing developments featuring the Kensa Shoebox heat pump.

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Heat Pump System

System architectureShared Ground Loop Arrays
Total heat pump capacity181.26kW
Equipment type50 x 3kW Shoebox & 35 x 6kW Shoebox
Design conditions0/45°C
Potable DHW temp60°C
Integral immersion heatersNo (DNO friendly)
Ground array typeBoreholes
Total depth of boreholes4,384 metres
*Boreholes based on average ground conductivity. Average 18 sq/m per property – each borehole serves a minimum of 2 properties.


Total Project Costs, Savings & Returns vs. Mains Gas Boiler

Kensa Ground Source Heat Pumps & Shared Borehole Ground Array

Gas Combi Boiler
Finance OptionSelf-FinancedFunded Split OwnershipSelf-Financed
Lifetime Expectancy: ApplianceUp to 20 yearsUp to 20 yearsUp to 10 years
Lifetime Expectancy: InfrastructureUp to 100 yearsUp to 100 yearsUp to 100 years
Carbon Saved vs. Gas (over 20 years)*1,129 TCO²1,129 TCO²-
Local NOx emissions Saved vs. Gas**18.2 kgNOx/y18.2 kgNOx/y-
Appliance & Infrastructure Cost***£606,960£358,053£323,000
Running Cost Savings vs. Gas (over 20 years) ****£31,509£31,509-
Servicing Costs Per Property (over 20 years)*****£2,000£2,000£2,000
RHI Income (over 20 years)******£962,582-Not eligible
Net cost (after 20 years)*******£355,622 profit£358,053 cost£323,000 cost
*Carbon saving based on carbon emissions of 0.519kgCO2/kWh for electric and 0.216kgCO2/kWh for gas. Assumes 80% efficiency for gas and 300% efficiency for ground source heat pumps.**NOx emission based on 44mg per kWh based on a worcester greenstar combi. ***Costs are for the design, supply and installation of the ground array and supply only of the ground source heat pump, cylinder, and antifreeze, to be installed by M&E contractor. Tenant network connection fee applies. ****Based on gas at 4.9p a unit and 80% 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 G3 Cylinder check will be requried. ******The Non-Domestic RHI is a 20 year index linked funding stream which assumes inflation at 3%. *******Net cost does not include servicing and running costs. net cost for gas does not include an additional gas boiler, which will likely need to be factored in during the 20 year comparison period due to a gas boiler’s 10 year average lifetime expectancy.
Please note: The Non-Domestic RHI has now ended. Visit Kensa Heat Pumps to explore current funding options.

Example: Capex

Cumulative Deficit / Surplus Over 20 Year RHI Period

social newbuild houses capex graph

Counterfactual based on mains gas costs
Please note: The Non-Domestic RHI has now ended. Visit Kensa Heat Pumps to explore current funding options.
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Related Content

Case Studies: South Western Housing Society, Tuckers Close

Ground source review: South Western Housing Society, Tuckers Close. An off-gas grid new build development of 12 affordable homes featuring individual Kensa Shoebox heat pumps connected to Shared Ground Loop Arrays.

Brochures: Funded Split Ownership for Shared Ground Loop Arrays

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.