Home energy · Calculator companion · By K Imports
Heating oil energy cost: practical guide
This guide explains how to use the Count.ie heating oil energy cost. Convert an oil delivery to useful heat and annual consumption. Follow the inputs, method and worked example below, then compare your own scenario.
Guide written .
Open the Heating oil energy cost calculatorWhat to prepare
- Use meter readings, bills, equipment specifications and actual tariff periods where possible.
- Separate power in kW from energy in kWh and daily use from annual use.
- Identify whether efficiency, standing charges and losses are included in the chosen model.
Understand the inputs
The calculation method
Useful heat per litre = energy content × boiler efficiency. Required litres = useful heat demand ÷ useful heat per litre.
Worked example
Illustrative inputs and their result.
Example inputs
- Delivery volume (litres)
- 1000
- Oil price (€/litre)
- 1.1
- Fuel energy content (kWh/litre)
- 10.35
- Seasonal boiler efficiency (%)
- 85
- Annual useful heat demand (kWh)
- 12000
Calculated example result
- Useful Heat Cost Per KWh
- €0.125/kWh
- Annual Fuel Cost
- €1,500.43
How to interpret the result
Energy consumption and money saved are different outputs. Results based on entered prices or efficiencies are scenarios, not a performance guarantee, installer quote or measured emissions assessment.
Use the same demand and time horizon for each option. Test a less favourable tariff, lower efficiency or lower use to see how sensitive the estimated saving is.
Common mistakes to avoid
- Do not count the same efficiency loss twice.
- Keep standing charges and unit charges separate when the model distinguishes them.
- Check seasonal demand, export restrictions and tariff assumptions before extrapolating.
Assumptions and sources
Fuel energy content and boiler performance are assumptions; confirm specification and measured performance. Delivery charges and maintenance are excluded.
If your case falls outside this scope, use a more suitable calculator or contact us about an unclear method.