This section illustrates the costs of replacing the heating and hot water systems in 28 social housing properties with Kensa ground source heat pumps. The scheme features an individual Kensa Shoebox Heat Pump in each house, connected to a Shared Ground Loop Array of boreholes.
We have provided a ground source heat pump design with schematic drawings and ground source heat pump installation costs for both self-financed and funded split ownership shared ground loop array options versus an electric night storage heater (NSH) alternative.
Example: Finances
Kensa has calculated example costs below to illustrate the upfront finance required for self-financed and funded split ownership Shared Ground Loop Arrays in a typical retrofit housing development featuring the Kensa Shoebox heat pump.
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 electric night storage heater system. For a bespoke quote please click here.
Heat Pump System
System architecture
Shared Ground Loop Arrays
Total heat pump capacity
135.9kW
Equipment type
28 x 6kW Shoebox
Design conditions
0/50°C
Potable DHW temp
60°C
Integral immersion heaters
No (DNO friendly)
Ground array type
Boreholes
Total depth of boreholes
2,500 metres
*Boreholes based on average ground conductivity. Average 18 sq/m per property – each borehole serves a minimum of 2 properties.
Total Project Costs, Savings & Returns vs Electric NSH
*Carbon saving based on carbon emissions of 0.519kgCO2/kWh for electric. Assumes 100% efficiency for electric and 300% efficiency for ground source heat pumps.**NOx emission based on 44mg per kWh based on a worcester greenstar combi. ***Based on electric at 15p/kW/hr and COP of 3. ****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 G3 Cylinder check will be requried. *****The Non-Domestic RHI is a 20 year index linked funding stream which assumes inflation at 3%. ******Net cost does not include servicing and running costs. ^ Retrofit costs include internal fit out i.e. new radiator systems. Tenant network connection fee applies.
Example: Capex
Cumulative Deficit / Surplus Over 20 Year RHI Period
Ground Source Review: South Shropshire Housing Association. Kensa Heat Pumps’ contracting division, Kensa Contracting Ltd, were appointed by South Shropshire Housing Association as the principal contractor for a £500k heating upgrade scheme comprising ground source heating systems at two of Shropshire’s sites; St Mary’s Place and College Close in Cleobury Mortimer,Shropshire. The scheme comprises twenty…
Download Kensa’s two-page guide to funded Shared Ground Loop Arrays in new build developments, including funded project examples and details of the funding mechanism.
