Boreholes

This section provides developers with a ground source heat pump design with schematic drawings, ground source heat pump installation costs comparative to LPG, and a real-life case study and ground source heat pump reviews to showcase how a new build development featuring a district ground source heat pump system fed by a borehole ground array can provide heating and hot water to multiple buildings.

For more information, call sales on 0845 680 4328.

Example: Schematic

For illustrative purposes only

Example: Project & Finances

Based on the above schematic, Kensa has calculated example costs below to illustrate the upfront finance required and the expected running costs and income generated via the Non-Domestic Renewable Heat Incentive (RHI) over a 20 year period (the duration of the Non Domestic RHI), compared to an LPG system. For a bespoke quote please click here.

Heat Pump Specification

System architectureMicro District
Total heat pump capacity52kW
Equipment type4 x 13kW Evo's
Design conditions0/40°C
Potable DHW temp60°C
Integral immersion heatersNo (DNO friendly)
Ground array typeBoreholes
Boreholes required*1200mtrs
Land area required600-900sq/m
*Boreholes based on average ground conductivity

 

Total Project Costs, Savings & Returns vs LPG

 Kensa Ground Source Heat Pump & Ground ArrayLPG Boiler
Lifetime Expectancy: ApplianceUp to 20 yearsUp to 10 years
Lifetime Expectancy: InfrastructureUp to 100 years-
Carbon Saved (over 20 years)300 tonnes0
Appliance & Infrastructure Cost*£77K to £107K£15K
Running Costs (over 20 years)**£115K to £135K£175K to £200K
Servicing Costs (over 20 years)***£0K£2K
RHI Income (over 20 years)****£170K to £200KNot eligible
Net cost (after 20 years)*****£22K to £42K£192K to £217K
*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, please speak to your plumbing contractor. **Based on electric at 15p/kW/hr and COP of 3. Based on LPG at 40p a litre and 85% 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. ****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 10 year average lifetime expectancy.

Not the ideal scenario for you?

Micro district borehole systems are ideally suited to larger projects with a minimum of 20 or more properties, where the return from the RHI will be greater.

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If your development is in an urban area with limited exposed land area available, then boreholes may be the most viable option.

Case study: The Dunes

‘The Dunes’, set for completion in June 2018 by developers Acorn Blue, is a landmark housing development comprising forty apartments and houses currently under construction on the site of a former derelict hotel amongst the famous dunes of Perranporth beach in Cornwall

Kensa’s Shoebox ground source heat pumps will be sited inside each of the dwellings to provide 100% of the two apartment blocks, five coach houses and four beach houses heating and hot water.

Read more