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How Much Heating Oil Do I Need?

Whether you're ordering for the first time or trying to budget for the year ahead, knowing how much heating oil your home needs can save you hundreds. Use our interactive calculator, check the usage table for your house size, and learn what affects consumption.

Interactive Calculator

Enter how much oil is in your tank now and see how long it will last based on the time of year and your heating habits.

Tank Calculator

Estimate when you'll need to refill

450L
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Heating scheduleOptional
8h
1h6h12h24h

Typical estimate assumes 8h/day. Increase if you run heating longer.

Lasts
About a month
Until
2 Apr

Typical Annual Usage by House Size

The table below shows approximate annual kerosene consumption for different home types in Ireland. These figures assume standard insulation and average heating habits.

House TypeAnnual Usage
1-2 bed apartment800 – 1,000 L/year
3-bed semi-detached1,200 – 1,500 L/year
4-bed detached1,500 – 2,000 L/year
5+ bed detached2,000 – 2,600 L/year

These are rough guides. A well-insulated 4-bed could use less than a poorly-insulated 3-bed. If you're unsure, start with a 500L order and track how long it lasts to calibrate your usage.

What Affects How Much Heating Oil You Use?

Four key factors determine your annual consumption. Understanding them helps you estimate your needs and find ways to reduce your heating bill.

Insulation Quality

Homes with poor wall, attic, or window insulation lose heat faster and burn more oil. Upgrading insulation can cut consumption by 20-40%. SEAI grants are available to help with costs.

Thermostat Settings

Every 1°C you raise the thermostat adds roughly 8-10% to your fuel bill. The recommended setting is 18-20°C. Use a programmable timer to heat only when you need it.

Boiler Age & Efficiency

Modern condensing boilers run at 90-95% efficiency. Older models may only achieve 70-80%, meaning up to 25% of your oil is wasted. A boiler service costs around €100 and helps maintain efficiency.

Weather & Climate

A harsh winter can increase consumption by 20-30% compared to a mild one. Coastal areas benefit from milder temperatures, while inland and elevated homes face colder conditions and higher usage.

Frequently Asked Questions

How much heating oil does a 3-bed house use per year?+
A typical 3-bed semi-detached house in Ireland uses between 1,200 and 1,500 litres of kerosene per year. This can vary depending on insulation quality, thermostat settings, boiler efficiency, and how harsh the winter is.
How long will 500 litres of heating oil last?+
500 litres of heating oil typically lasts between 2 and 4 months, depending on your home size, insulation, and heating habits. In winter you may use 5-10 litres per day, while in summer usage drops to near zero. Use our calculator above for a personalised estimate.
How much heating oil do I need for winter?+
Most Irish homes need between 800 and 1,500 litres to get through the winter heating season (October to March). A well-insulated 3-bed home may need as little as 800L, while a larger or older property could require 1,500L or more.
What factors affect how much heating oil I use?+
The main factors are: home size and number of rooms heated, insulation quality (walls, attic, windows), thermostat settings, boiler age and efficiency, weather conditions, and how many hours per day the heating runs. Improving insulation is the single most effective way to reduce consumption.

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