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Fuel sourcekWh provided per unit of fuelUnit typeEfficiency of system (%)Units consumed by house (kWh)Price per unit of fuel (£)Units of fuel consumed per annumUnit typeTotal cost per annum
Oil Heating
Heating oil (new condensing)10.2per litre9025555.55555560.312505.44662309litre776.688453159
Heating oil (new non condensing)10.2per litre8527058.82352940.312652.82583622litre822.376009227
Heating oil (old low efficiency)10.2per litre6535384.61538460.313469.07993967litre1075.4147813
Gas Heating
Natural gas (new condensing)1kWh9025555.55555560.0425555.5555556kWh1022.22222222
Natural gas (new non condensing)1kWh8527058.82352940.0427058.8235294kWh1082.35294118
Natural gas (old low efficiency)1kWh6535384.61538460.0435384.6153846kWh1415.38461538
LPG (new condensing)6.6litre8925842.69662920.383915.56009534litre1487.91283623
LPG (new non condensing)6.6litre8527058.82352940.384099.82174688litre1557.93226381
LPG(old low efficiency)6.6litre6535384.61538460.385361.30536131litre2037.2960373
Electric Heating
Air source heat pump*1kWh2907931.034482760.147931.03448276kWh1110.34482759
Ground source heat pump*1kWh3606388.888888890.146388.88888889kWh894.444444444
Off-peak Electricity (reduced tariff)1kWh100230000.06823000kWh1564
Electricity (standard full rate)1kWh100230000.1423000kWh3220
Wood Fueled Heating
Wood pellets (High efficiency biomass)4800per tonne9025555.55555562565.32407407407tonne1362.96296296
Wood chip (High efficiency biomass)3500per tonne9025555.55555561207.30158730159tonne876.19047619
Log burning (High efficiency biomass)3500per tonne90255551657.30158730159tonne1204.76190476
Modern Clean burn stove3500per tonne75306661658.7619047619tonne1445.71428571
Open fire3500per tonne2011500016532.8571428571tonne5421.42857143
The above figures are based on a typical UK households heating and hotwater needs per annum of:23000kWh per year