This section provides developers with schematic drawings, example Kensa heat pump and ground array costs comparative to LPG, and a real-life case study to showcase how a micro-district ground source heat pump system fed by a borehole ground array can provide heating and hot water to multiple buildings.
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 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 Specification
|System architecture||Micro District|
|Total heat pump capacity||52kW|
|Equipment type||4 x 13kW Evo's|
|Potable DHW temp||60°C|
|Integral immersion heaters||No (DNO friendly)|
|Ground array type||Boreholes|
|Land area required||600-900sq/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)||300 tonnes||0|
|Appliance & Infrastructure Cost*||£77K to £107K||£15K|
|Running Costs (over 20 years)**||£115K to £135K||£175K to £200K|
|Servicing Costs (over 20 years)***||£0K||£2K|
|RHI Income (over 20 years)****||£170K to £200K||Not eligible|
|Net cost (after 20 years)*****||£22K to £42K||£192K to £217K|
*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.
Not the ideal scenario for you?
Micro district 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 development is in an urban area with limited exposed land area available, then boreholes may be the most viable option.
Case study: The Dunes
‘The Dunes’, set for completion in June 2018 by developers Acorn Blue, is a landmark housing development comprising forty apartments and houses currently under construction on the site of a former derelict hotel amongst the famous dunes of Perranporth beach in Cornwall
Kensa’s Shoebox ground source heat pumps will be sited inside each of the dwellings to provide 100% of the two apartment blocks, five coach houses and four beach houses heating and hot water.Read more