If your boiler is more than 15 years old, it usually consumes more gas and wears out faster. It may also no longer meet current energy requirements. Is it time to replace it?
Even if your old boiler still seems to be working well, it can cost you a lot in energy. New installations are up to 30% more efficient. They offer greater comfort and improve your EPC score and property value. You’ll also be better prepared for stricter energy regulations.
Checklist: Do you need to replace your boiler?
Answer these questions:
- Is your boiler more than 15 years old?
- Is your gas consumption increasing year after year?
- Are there breakdowns or costly repairs?
- Are you heating with a system that no longer meets current standards?
- Are you considering solar panels or do you already have them?
- Is your home insulated or are you planning insulation work?
Answered “yes” several times? Then replacing is probably a good idea. Here are 5 points to consider to make the right choices.
Always start with insulation
A new boiler makes little sense if the heat escapes quickly. Insulation is the first logical step to reduce consumption and improve comfort.
Start with the roof. An uninsulated roof causes the greatest heat loss. By insulating the roof, your heating needs and energy bill drop significantly.
Walls and windows also play a major role. Poorly insulated walls or old windows create thermal bridges and make even a modern boiler less efficient.
Take your time and plan wisely
A new boiler is an investment. Compare installers, request multiple quotes and get good advice. Consider planning in summer: heating specialists are more available and you’ll experience fewer disruptions.
Choose a system that suits your home
Rather than simply replacing your gas boiler, it might be time to switch to a hybrid or fully electric heat pump. Heat pumps are particularly cost-effective if your home is well-insulated. If you need to replace your boiler urgently and can't afford better insulation, a condensing boiler remains the best solution.
In the city, your options may be limited, as some heat pumps require outdoor space, which isn’t always available in terraced houses or flats.
A reversible heat pump also offers an advantage: it can be used to cool a home in the summer. This is particularly beneficial if you have solar panels, as you can then produce some of the electricity needed.
Check the regulations
In Brussels, installing a new oil-fired boiler is generally prohibited, except in exceptional cases (e.g. when it’s technically impossible to install another system).
Are you a co-owner? Check the rules on shared chimneys and flue ducts.
Consider adjustments to your installation
When switching to a condensing boiler, adjustments are often necessary:
- Your chimney must be moisture-resistant (lining may be necessary).
- You need a PVC drain for condensate.
If you choose a heat pump, make sure your home is well-insulated and that the radiators are sufficiently powerful:
- This requirement applies primarily to low-temperature heat pumps, which operate at temperatures between 30 and 50°C.
- High-temperature heat pumps (60 to 70°C) can generally work with existing radiators without major modifications.
Grants and financial support
A new boiler or heat pump costs money. But with the right support measures, the investment becomes much more affordable. Check with Brussels Environment and your local authority which grants you can apply for.
Also see if you qualify for a social loan or an energy loan at a low interest rate. Savings on your energy bill offset part of the repayment.
Sometimes you can spread the work: start with the chimney, radiators or insulation and do the rest later. Your old boiler may even have scrap metal value.
Kosten en terugverdientijd
De totale kost voor de vervanging van je verwarmingsketel zijn afhankelijk van de isolatieniveau van je huis en het bedrag dat je kan investeren.
- A condensing boiler usually costs €4,000 to €7,000.
- A heat pump costs €3,000 to €16,000, depending on type and installation.
The payback time is usually between 5 and 10 years, depending on your consumption, insulation and the amount of grants you receive. The better insulated your home, the faster you recover your investment.