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£0.42£0.04392%£587416%£0.16£490£979495£0.196£185617%
Large18500£0.42£0.04392%£869416%£0.16£725£14414053£0.196£274717%
Very Large30000£0.42£0.04392%£1402416%£0.16£1153£24922788£0.196£446617%

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%201090.0467£93900£114
Oil1850092%201090.0432£86900£100
LPG1850092%201090.0558£1,12200£100
ASHP18500401%46130.1631£7520.075113887£1,043£50
Biomass boiler1850085%217650.05931£1,2910.04218500£779£250
GSHP18500416%44470.1631£7250.195514053£2,747£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 on a rolling 3 month average from October 2016 to December 2016, provided by Nottingham Energy Partnership (NEP). Costs for off peak electric heating are not provided by NEP – derived from SSE 2 Year Fixed Economy 10 tariff data.

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:

http://blog.greenwisebusiness.co.uk/2013/04/10-things-your-installer-wont-tell-you-before-you-purchase-a-biomass-boiler/

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