Boreholes

How much will a ground source heat pump borehole system cost?

In this example, a cascaded ground source heat pump system fed by a borehole ground array, could cost in the region of £217,000 to £232,000, and earn between £350,000 and £400,000 income from the Non Domestic Renewable Heat Incentive (RHI).

For more heat pump prices, call Kensa on 0845 680 4328.

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 Non-Domestic Renewable Heat Incentive (RHI) over a 20 year period (the duration of the Non Domestic RHI), compared to an LPG system. For a bespoke quote please click here.

Heat Pump System

System architecture Cascaded central plant
Total heat pump capacity 120kW
Equipment type 3x 45kW Plant Rooms
Design conditions 0/50°C
Potable DHW temp Space heating only
Integral immersion heaters No (DNO friendly)
Ground array type Boreholes
Boreholes required* 2700mtrs
Land area required 2000sq/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) 800 tonnes 0 tonnes
Appliance & Infrastructure Cost* £217K to £232K £7K
Running Costs (over 20 years)** £350K to £400K £450K to £550K
Servicing Costs (over 20 years)*** £0K £2K
RHI Income (over 20 years)**** £350K to £500K Not eligible
Net cost (after 20 years)***** £132 to £217K £459K to £559K

*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.

Example: Schematic

*For illustrative purposes only

Not the ideal scenario for you?

Borehole systems are ideally suited to larger projects with a minimum of 20 or more properties, where the return from the RHI will be greater.

Click here for more options

If your business is in an urban area such an industrial park with limited exposed land area available, then boreholes may be the most viable option.

Case study: Charlestown School

Located next to a busy railway line this school required an efficient heating and cooling system that could operate all year round. The solution was to install an 80 kW cascaded ground source heat pump system connected to ten boreholes located underneath adjacent playing fields. Overall heating costs have been reduced by 75%.

Key facts:

  • Retrofit installation of 1960s building;
  • Cascaded ground source heat pump system;
  • 80kW Kensa Plantroom heat pumps;
  • Providing heating and cooling;
  • 10x boreholes under playing field;
  • 75% reduction in heating costs.
Read more

Related Content

Blog: Cascaded ground source heat pumps

If a commercial premises has a high demand for heating and hot water, then modular cascaded ground source heat pumps provide an effective solution to meet the heat load of the property.