Heating Oil Additive Savings Calculator
Calculate whether a heating oil additive is likely to pay back for your home, using your annual litres, boiler age, tank condition and expected maintenance benefit.
How Heating Oil Additives Work
Combustion Efficiency
Quality heating oil additives are designed to improve combustion by supporting more complete burning of fuel. In this calculator we model conservative-to-optimistic efficiency assumptions so you can see whether the numbers still work for your home.
Tank & System Protection
Additives contain stabilisers and anti-corrosion agents that protect your tank and fuel lines from rust and sediment. This can support longer equipment life and reduce costly blockages in filters and burner nozzles.
Sludge Prevention
Over time, heating oil can degrade and form sludge, especially in tanks that aren't topped up regularly. Fuel stabilisers in additives may help slow this degradation, keeping your oil more stable and your system running smoothly.
Reduced Maintenance
Cleaner combustion means less soot and carbon buildup in your boiler's heat exchanger. That can support cleaner scheduled servicing and reduce the likelihood of filter or nozzle issues between annual checks.
Key Benefits of Heating Oil Additives
- Potential combustion-efficiency improvement
- Cleaner operation between scheduled services
- Protection against tank corrosion and sludge
- Cleaner burner and heat exchanger
- Fewer filter and nozzle replacements
- Reduced carbon emissions
Important Considerations
- Quality matters - Choose reputable brands specifically designed for kerosene/28-second heating oil, not diesel additives.
- Follow dosage instructions - More isn't better. Overdosing can cause issues with burner performance.
- Check boiler warranty - Some manufacturers specify approved additives. Check your manual or contact the manufacturer.
- Regular servicing still essential - Additives complement, but don't replace, annual boiler servicing.
Our Calculation Sources
- OFTEC (Oil Firing Technical Association) - Guidance on heating oil maintenance, additives, and boiler efficiency standards.
- Energy Saving Trust - UK household heating costs and efficiency improvement potential.
- Department for Energy Security & Net Zero - UK energy statistics and household consumption data.
- Which? Boiler Service Guide - Average UK boiler service costs and typical maintenance requirements.
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Useful Guides Before You Buy
Frequently Asked Questions About Heating Oil Additives
Are heating oil additives worth considering?
For some UK households using heating oil, additives can be worth considering. They typically cost £10-25 per year (for 1,500-2,000 litres) and may save £40-100+ annually through improved combustion efficiency, fewer maintenance issues, and cleaner operation. The benefits are often stronger for older boilers and tanks where sludge and deposits are more common.
How much can heating oil additives save me?
Typical savings from heating oil additives range from £40-120 per year for an average UK home. This includes possible fuel savings from improved combustion efficiency, plus reduced maintenance costs from fewer filter changes and cleaner nozzles between scheduled annual services. Use our calculator above for a personalised estimate.
Do heating oil additives really work?
Quality heating oil additives are designed to improve combustion, reduce sludge formation, and protect your tank and fuel system. The actual result depends on your boiler, tank condition, dosage, and maintenance history. The key is using a reputable product specifically designed for kerosene/28-second heating oil, not diesel additives, and following the correct dosage.
What is the best heating oil additive UK?
There is no single best additive for every home, but a strong choice is a multi-function formula designed for kerosene heating oil (28-second oil) with combustion improvers, stabilisers, and anti-corrosion support. If you want a quick option,see our recommendation.As an Amazon Associate, OilCompare earns from qualifying purchases.
When should I add heating oil additive?
Add heating oil additive when you receive a fresh delivery of oil - this ensures proper mixing throughout your tank. For best results, add the additive to your tank just before or during the delivery. Most additives treat 500-1000 litres per dose, so check the product instructions and match the dosage to your delivery size.
Can heating oil additives damage my boiler?
Quality heating oil additives designed for kerosene will not damage your boiler when used correctly. However, using diesel additives, overdosing, or using poor quality products can potentially cause issues. Always use additives specifically formulated for heating oil, follow dosage instructions, and check your boiler manufacturer's recommendations if in doubt.
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