How much will a ground source heat pump with boreholes cost?
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).
The costed example below reviews how the costs and savings breakdown for a single building connected to boreholes serving a Kensa Evo Heat Pump compared to an LPG boiler alternative.
Example: Project & Finances
Kensa has calculated example costs to illustrate the upfront finance required for a Kensa ground source heat pump and boreholes, compared to an LPG system.
Expected running costs and Domestic Renewable Heat Incentive (RHI) income are also included.
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Heat Pump Specification
|System architecture||Single heat pump|
|Heat pump capacity||13kW|
|Equipment type||13kW Evo|
|Potable DHW temp||60°C|
|Intregral immersion heaters||No (DNO friendly)|
|Ground array type||Boreholes|
|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.
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: Read more