Source Ref

Page: Heat Pump vs Boiler

A: Independent industry sources report that typical UK oil-heated homes consume between 1,900 and 2,500 litres of heating oil per year.

B: D x C (efficiency of oil boiler)

C:

• Oil Boiler Efficiency: According to BPEC’s Domestic Heating by Oil (CE29) guide, older oil boilers typically operate at 60–70% efficiency. 
  
  
• Heat Pump Efficiency According to the Energy Saving Trust, modern heat pumps are between 300% and 400% efficient, meaning that for every unit of electricity used, they can deliver three to four units of heat.
  
  D:

• A x 10.35 (for oil) – One litre of kerosene in the UK contains approximately 10.35 kWh of energy.
  
  
• B/C (for heat pump)

E:

• Oil Price – Over the last 12 months, the price of heating oil has fluctuated between ~51p and 67p per litre, averaging around ~62p/litre (including VAT).
  
  
• Electricity Price – Over the last four quarters starting Q2 2025 domestic electricity prices have ranged from around 24.5p to 27.0p per kilowatt-hour. The average across this period is approximately 53p/kWh

F:

• Oil – E x A
• Heat Pump– D x E

G = F (oil) – F (heat pump)

CO₂ Savings: Based on Energy Saving Trust modelling for a typical three-bedroom semi-detached home in Great Britain.