How much will ground source heat pumps with slinkies cost for multiple properties?
Four individual Kensa Evo ground source heat pumps inside four separate domestic buildings connected by a Shared Ground Loop Array of slinkies, could cost in the region of £56,000 and £72,000, and earn between £170,000 and £200,000 income from the Non Domestic Renewable Heat Incentive (RHI).
The costed example below reviews how the costs and savings breakdown for a small project of four properties featuring a Shared Ground Loop Array of slinkies serving Kensa Evo Heat Pumps compared to an LPG boiler alternative.
Example: Project & Finances
Kensa has calculated example costs to illustrate the upfront finance required for Shared Ground Loop Arrays featuring slinkies connected to Evo heat pumps in a small development of four houses, 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||Slinkies|
|Land area required||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|
|Local NOx emissions (Annual)*||0kg NOx/y||5.24kg NOx/y|
|Appliance & Infrastructure Cost**||£56K to £72K||£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)*****||£114K to £128K 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