Assumptions

Figures from page 4 of ‘Make Your Self Build Self Sufficient’:

House sizekWh/yrOil cost/lOil cost/kWhOil boiler efficiencyAnnual oil running costHP SPFElec cost/kWhAnnual GSHP running costRunning cost savingRenewable kWh/yrRHI tariff p/kWhRHI Income% fuel saving
Medium12500£0.51£0.0692%£778.53449%£0.16£346.23£432.319716£0.21£2,029.6756%
Large18500£0.51£0.0692%£1,152.23427%£0.16£530.85£621.3814167£0.21£2,959.4954%
Very Large30000£0.51£0.0692%£1.868.48394%£0.16£925.40£943.0822788£0.21£4,760.4150%

Figures exclude inflation.

 

Figures from page 10 of ‘Make Your Self Build Self Sufficient’:

 kWh/yrEfficiencykWh/yrFuel costAnnual running costRHI tariffRen kwh/yrRHI income/yrMaintenance
Gas1850092%201090.04£840.5400£114
Oil1850092%201090.06£1,152.2300£100
LPG1850092%201090.06£1,260.8200£100
ASHP18500401%46130.16£738.150.1113,887£1,487.25£50
Biomass boiler1850085%217650.06£1,231.880.0718,500£1,272.80£250
GSHP18500427%43330.16£693.210.2114,167£2,987.77£50

Figures based on a large new self build home or medium sized renovated home. 18,500kWh/yr.

Figures exclude inflation.

Energy costs are based Feburary 2020 costs, provided by Nottingham Energy Partnership (NEP). Costs for  electricity heating are not provided by NEP – derived from an average of the ‘big’ six electricity prices for Febtuary 2020 and excludes any standing charges.

Gas based on BG Homecare 100. https://www.britishgas.co.uk/products-and-services/homecare/homecare-100/

Biomass based on 4800kWh/tonne at £235 per tonne.

For further reading:

https://www.biomassenergycentre.org.uk/pls/portal/docs/PAGE/PRACTICAL/INSTALLING%20BIOMASS%20SYSTEMS/BEC%20FAQ%20V1%20JUNE%2009.PDF