This section illustrates the costs of a small luxury new-build development featuring a Shared Ground Loop Array of slinkies serving Kensa Evo Heat Pumps.

We have provided a ground source heat pump design with schematic drawings and ground source heat pump installation costs for shared ground loop array options versus the LPG boiler alternative.

For a ground source heat pump review and case study we also showcase a small new build development featuring a Shared Ground Loop Array of slinkies connected to Kensa ground source heat pumps.

For more information, call sales on 0845 680 4328.

Example: Schematic

For illustrative purposes only

Example: Finances

Based on the above schematic, Kensa has calculated example costs below to illustrate the upfront finance required for self-financed and funded split ownership Shared Ground Loop Arrays featuring slinkies connected to Evo heat pumps in a small development.

Also included are expected running costs and income generated via the Non-Domestic Renewable Heat Incentive (RHI) over a 20 year period (the duration of the Non Domestic RHI), compared to an LPG boiler system. For a bespoke quote please click here.

Heat Pump Specification

System architecture Shared Ground Loop Array
Total heat pump capacity 52kW
Equipment type 4x 13kW Evo's
Design conditions 0/40°C
Potable DHW temp 60°C
Integral immersion heaters No (DNO friendly)
Ground array type Slinkies
Slinkies required 14
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* 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.

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