This section provides self-builders with a ground source heat pump design with schematic drawings, ground source heat pump installation costs and a real-life case study and ground source heat pump reviews to showcase how a single ground source heat pump system fed by a borehole ground array can provide heating and hot water to a single property.
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 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|
|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 20 years)||28 tonnes||0 tonnes|
|Appliance & Infrastructure Cost*||£25K to £32K||£1.5K|
|Running Costs (over 7 years)**||£9K to £11K||£14K to £16K|
|Servicing Costs (over 7 years)***||£0K||£700|
|Domestic RHI Income (over 7 years)****||£24K - £28K||Not eligible|
|Net cost (after 7 years)*****||£10K - £15K||£16.2K - £18.2K|
*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.
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.
- 550m² new-build eco home;
- Kensa 20kW Twin Compact ground source heat pump;
- Underfloor heating & polished concrete floors;
- Restricted land area in urban location;
- Borehole ground array;
- Eligible for Domestic Renewable Heat Incentive (RHI).