Figures from page 4 of ‘Make Your Self Build Self Sufficient’:
| House size | kWh/yr | Oil cost/l | Oil cost/kWh | Oil boiler efficiency | Annual oil running cost | HP SPF | Elec cost/kWh | Annual GSHP running cost | Running cost saving | Renewable kWh/yr | RHI tariff p/kWh | RHI Income | % fuel saving |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Medium | 12500 | £0.42 | £0.043 | 92% | £587 | 449% | £0.16 | £454 | £133 | 9716 | £0.199 | £1930 | 23% |
| Large | 18500 | £0.42 | £0.043 | 92% | £869 | 427% | £0.16 | £706 | £162 | 14167 | £0.199 | £2814 | 19% |
| Very Large | 30000 | £0.42 | £0.043 | 92% | £1402 | 394% | £0.16 | £1153 | £249 | 22788 | £0.199 | £4466 | 17% |
Figures exclude inflation.
Figures from page 10 of ‘Make Your Self Build Self Sufficient’:
| kWh/yr | Efficiency | kWh/yr | Fuel cost | Annual running cost | RHI tariff | Ren kwh/yr | RHI income/yr | Maintenance | |
|---|---|---|---|---|---|---|---|---|---|
| Gas | 18500 | 92% | 20109 | 0.0467 | £939 | 0 | 0 | £114 | |
| Oil | 18500 | 92% | 20109 | 0.0432 | £869 | 0 | 0 | £100 | |
| LPG | 18500 | 92% | 20109 | 0.0558 | £1,122 | 0 | 0 | £100 | |
| ASHP | 18500 | 401% | 4613 | 0.1631 | £752 | 0.0751 | 13887 | £1,414 | £50 |
| Biomass boiler | 18500 | 85% | 21765 | 0.05931 | £1,291 | 0.042 | 18500 | £1,210 | £250 |
| GSHP | 18500 | 427% | 4333 | 0.1631 | £707 | 0.1986 | 14167 | £2,814 | £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.
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