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 pond mats 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 20 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|
|Integral immersion heaters||No (DNO friendly)|
|Ground array type||Pond Mats|
|Pond mats required||x4|
|Lake area required - no flow||1000sq/m|
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*||£14.5K to £16.5K||£1.5K|
|Running Costs (over 7 years)**||£9K to £11K||£14K to £16K|
|Servicing Costs (over 7 years)***||£0K||£700|
|RHI Income (over 7 years)****||£24K - £28K||Not eligible|
|Net cost (after 7 years)*****||£0K||£16.2K|
*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: River House
Mr Clarke replaced his gas boiler with a Kensa 24kW Single Phase Twin Compressor to harness heat energy from a nearby lake to provide space heating and hot water to his Grade II listed farmhouse.
- 24kW Single Phase Twin Compressor
- Replaced mains gas boiler
- Large, Grade II listed farmhouse
- Highly efficient water source system
- Pond mats sunk into lake
- Costs covered by Renewable Heat Incentive