Boreholes (500sq/m area)

This section illustrates the costs of installing a cascaded system of Kensa Commercial Plant Room ground source heat pumps to provide space heating to a medium-sized commercial building with a 75kW peak heat load and 102,500kWh annual space heating demand.

Kensa has calculated this example will require a 500m2 area for the borehole ground array infrastructure.

In this example, a cascaded ground source heat pump system fed by a borehole ground array, could cost in the region of £186,859. We have provided ground source heat pump installation costs for both self-financed and funded split ownership options versus an LPG boiler alternative.

Example: Finances

Kensa has calculated example costs below to illustrate the upfront finance required and the expected running costs over a 20-year period compared to an LPG system. For a bespoke quote, please click here.

Heat Pump System

System architectureCascaded central plant
Total heat pump capacity75kW
Equipment type2 x 40kW Plant Rooms
Design conditions0/50°C
Potable DHW tempSpace heating only
Integral immersion heatersNo (DNO friendly)
Ground array typeClosed loop boreholes
Boreholes required*1800mtrs
Land area required500sq/m
*Boreholes based on average ground conductivity

Total Project Costs, Savings & Returns vs LPG

Kensa Ground Source Heat Pumps & Borehole Ground Array

LPG Boiler
Finance OptionSelf-FinancedFunded Split OwnershipSelf-Financed
Lifetime Expectancy: Appliance20 to 25 years20 to 25 years12 to 15 years
Lifetime Expectancy: Infrastructure> 100 years> 100 yearsN/A
Carbon Saved (over 20 years)*422 tonnes422 tonnesN/A
Local NOx emissions (over 20 years)**0kg NOx/y0kg NOx/y135kg NOx/y
Appliance & Infrastructure Cost***£186,859£113,111£20,000
Running Costs (over 20 years)****£130,906£130,906£184,994
Servicing Costs (over 20 years)*****£10,218£10,218£20,436
RHI Income (over 20 years)******£251,183£0Not eligible
Net cost (after 20 years)*******£76,800£254,235£225,430
*Carbon saving based on carbon emissions of 0.233kgCO2/kWh for electric and 0.241kgCO2/kWh for LPG. Assumes 100% efficiency for electric and 300% efficiency for ground source heat pumps and 85% efficiency for LPG.**NOx emissions based on 56mg/Kwh for gas and liquefied petroleum gas (LPG) boilers ***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 as will be approximately the same for both GSHP and LPG system. ****Based on electric at 15p/kWh and COP of 3. Based on LPG at 40p a litre, energy content of 6.66 kWh/litre and 85% efficiency. Running costs increase by 2.5% per year. *****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 15 year average lifetime expectancy.
Please note: The Non-Domestic RHI has now ended. Visit Kensa Heat Pumps to explore current funding options.

Example: Schematic

*For illustrative purposes only

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