How much will a ground source heat pump pond mat system cost for a small housing development?
A shared ground loop array ground source heat pump system with pond mats for four luxury houses could cost £52,000 and earn £170,000 via the Non Domestic Renewable Heat Incentive.
The costed example below reviews how the costs and savings breakdown for a small luxury new-build development featuring a Shared Ground Loop Array of pond mats serving Kensa Evo Heat Pumps compared to an LPG boiler alternative.
Kensa has calculated example costs to illustrate the upfront finance required for Shared Ground Loop Arrays featuring pond mats connected to Evo heat pumps in a small development, compared to an LPG system.
Expected running costs and Non-Domestic Renewable Heat Incentive (RHI) income are also included.
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Heat Pump Specification
|System architecture||Shared Ground Loop Array|
|Total heat pump capacity||52kW|
|Equipment type||4x 13kW Evo's|
|Potable DHW temp||60°C|
|Integral immersion heaters||No (DNO friendly)|
|Ground array type||Pond mats|
|Pond mats required||14|
|Lake surface area - no flow||3500sq/m|
Total Project Costs, Savings & Returns vs LPG
| ||Kensa Shared Ground Loop Array & GSHP||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)||300 tonnes||0 tonnes|
|Local NOx emissions (Annual)*||0kg NOx/y||5.24kg NOx/y|
|Appliance & Infrastructure Cost**||£52K to £64K||£15K|
|Running Costs (over 20 years)***||£115K to £135K||£175K to £200K|
|Servicing Costs (over 20 years)****||£0||£2K|
|RHI Income (over 20 years)*****||£170K to £200K||Not eligible|
|Net cost excluding running & servicing (after 20 years)*****||£118K to £136K profit||£15K cost|
*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 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.
For illustrative purposes only
Homeowners and self-builders whose projects feature two or more domestic buildings on one site, could be earning themselves a profitable income by utilising a simple district ground source heat pump system architecture to unlock quarterly payments from the Government’s Non Domestic Renewable Heat Incentive (RHI) scheme for the next 20 years. More commonly associated with…