Boreholes

How much will a ground source heat pump with boreholes cost?

In this example, a single Kensa Evo ground source heat pump fed by a borehole ground array could cost in the region of £25,000 and £32,000, and earn between £24,000 and £28,000 income from the Domestic Renewable Heat Incentive (RHI).

For more heat pump prices, call Kensa on 0845 680 4328.

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 Domestic Renewable Heat Incentive (RHI) over a 7 year period, compared to an LPG system. For a bespoke quote please click here.

Heat Pump Specification

System architecture Single heat pump
Heat pump capacity 13kW
Equipment type 13kW Evo
Design conditions 0/40°C
Potable DHW temp 60°C
Intregral immersion heaters No (DNO friendly)
Ground array type Boreholes
Boreholes required* 360mtrs
Land area required 200sq/m

*Boreholes based on average ground conductivity

 

Total Project Costs, Savings & Returns vs LPG

  Kensa Ground Source Heat Pump & Ground Array LPG Boiler
Lifetime Expectancy: Appliance Up to 20 years Up to 10 years
Lifetime Expectancy: Infrastructure Up to 100 years -
Carbon Saved (over 7 years) 28 tonnes 0 tonnes
Local NOx emissions* 0kg NOx/y 1.31kg NOx/y
Appliance & Infrastructure Cost* £25K to £32K £1.5K
Running Costs (over 7 years)** £9K to £11K £14K to £16K
Servicing Costs (over 7 years)*** £0 £700
Domestic RHI Income (over 7 years)**** £24K - £28K Not eligible
Net cost (after 7 years)***** £10K - £15K £16.2K - £18.2K

*NOx emissions based on 56mg/Kwh for gas and liquefied petroleum gas (LPG) boilers (1800 run hours) **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 DOMESTIC RHI is a 7 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.

Example: Schematic

For illustrative purposes only

Case study: Eco House, Wanstead

Architect Jason Harris was looking for a renewable heating system to complement an innovative eco home he was building in East London. Land area was restricted due to the urban nature of the site, but thanks to a unique borehole drilling method, a Kensa ground source heat pump was successfully installed.

Key facts:

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