Boiler Replacement & Service Quotes in Ireland
Compare up to 4 local boiler replacement & service professionals. Free, no obligation quotes.
If your boiler is over 15 years old, frequently breaking down, or costing more to repair than it is worth, replacement is almost certainly the right decision. A modern condensing boiler runs at 90 to 94% efficiency compared to 60 to 80% for older non-condensing models. That efficiency gap translates directly into lower fuel bills: replacing an old boiler typically saves €300 to €500 per year on heating costs.
Ireland's boiler market is split between gas and oil. If you are on the mains gas network (primarily urban areas), a gas condensing boiler is the standard replacement. If you are in a rural area without mains gas, oil remains the most common option, though many homeowners in this position are now considering heat pumps as a longer-term alternative. If your home is well-insulated, a heat pump may be a better investment than a new oil boiler.
Annual boiler servicing is equally important. A yearly service by a registered technician ensures your boiler runs safely and efficiently, maintains your manufacturer's warranty, and catches small problems before they become expensive breakdowns. For gas boilers, your technician must be RGII-registered. For oil boilers, OFTEC registration is the equivalent standard.
Boiler replacement is not a job where every installer charges the same. Prices vary by brand, boiler model, the complexity of the installation (especially if the boiler is being relocated), and whether the flue, controls, or pipework need upgrading. Getting three quotes protects you from overpaying and helps you understand what each installer is recommending and why.
SEAI Grants May Apply
Some boiler replacement & service work qualifies for SEAI grants of up to €8,000 or more. Check eligibility and current grant amounts on our energy guide.
Check SEAI Grants on HomeEnergyGuide.ieHow Much Does Boiler Replacement & Service Cost in Ireland?
Typical pricing for boiler replacement & service services in Ireland (2026):
| Service | Typical Cost | Notes |
|---|---|---|
| Gas boiler replacement | €2,500 | €4,500 | Boiler brand, system complexity |
| Oil boiler replacement | €3,000 | €5,000 | Boiler brand, tank condition |
| Annual boiler service | €80 | €150 | Boiler type, location |
Gas boiler costs depend on the brand (Vaillant, Worcester Bosch, and Ideal are the most common in Ireland), the output rating (24kW to 35kW for most homes), and whether the installation is a straightforward swap or requires relocating the boiler, upgrading the flue, or modifying pipework. Oil boiler replacement is more expensive because oil boilers are larger, heavier, and the fuel supply system (tank, lines, filter) may also need attention. Labour rates in Dublin run 15-20% above rural areas.
What to Expect: The Boiler Replacement & Service Process
- A registered technician visits to assess your current boiler, heating system, and hot water requirements. They check the flue, gas or oil supply, controls, and pipework condition.
- You receive a quote specifying the recommended boiler brand and model, output rating, flue type, any additional work needed (pipework, controls, cylinder), and a warranty summary.
- Old boiler removal. The technician drains the system, disconnects and removes the old boiler, and disposes of it properly.
- New boiler installation, typically completed in one day for a straightforward swap. The new boiler is mounted, connected to the heating and hot water pipework, the flue is installed, and the system is filled and pressurised.
- Commissioning and testing. The technician fires the boiler, checks all safety controls, sets the programmer and thermostat, runs a flue gas analysis to confirm efficient combustion, and issues a compliance certificate.
- Registration. Gas boilers must be registered with RGII. Oil boilers should be registered with OFTEC. Your installer handles this.
Common Mistakes to Avoid
- Keeping an old boiler running past its useful life. Spending €400 per year on repairs for a 20-year-old boiler is poor value when a new boiler costs €3,000 and will save you €300 to €500 annually in fuel.
- Not getting the system flushed before a new boiler is installed. Old sludge in your radiators and pipes will clog the new boiler's heat exchanger within months, causing premature failure and potentially voiding the warranty.
- Choosing a boiler based on price alone without considering output rating. An underpowered boiler will not heat your home adequately. An oversized boiler wastes fuel cycling on and off. Your installer should size the boiler to match your home's heat demand.
- Forgetting to schedule annual servicing. A single missed service can void a 10-year manufacturer warranty. Set a recurring reminder and book well before winter when demand peaks.
- Not considering a heat pump if your home is already well-insulated. Many homeowners automatically replace oil with oil, missing the opportunity to switch to a heat pump with €6,500 SEAI grant support.
What to Look for When Hiring a Boiler Replacement & Service Professional
For gas boilers, your installer must be RGII-registered (Registered Gas Installers of Ireland). It is a criminal offence for an unregistered person to work on gas appliances in Ireland. Check the RGII register at rgii.ie. For oil boilers, OFTEC registration is the industry standard, though it is not a legal requirement in the same way as RGII. Either way, check for public liability insurance and ask about workmanship guarantees (typically 2 to 5 years on the installation, separate from the manufacturer's boiler warranty). Be cautious of installers who do not mention a flue gas analysis (this is required to confirm the boiler is burning safely and efficiently) or who cannot explain why they are recommending a particular boiler model and output rating for your home.
Questions to Ask Your Boiler Replacement & Service Professional
- Are you RGII (gas) or OFTEC (oil) registered? RGII registration is a legal requirement for gas work. OFTEC registration ensures your oil installer is trained and competent. Always verify registration before allowing any work to begin.
- What boiler brand and model do you recommend and why? A good installer recommends a boiler based on your home's heat demand, not just price. Ask why they prefer one brand over another and what the warranty terms are.
- Is the quoted price all-inclusive? Ensure the quote covers the boiler, flue, controls, any pipework modifications, system flush, commissioning, disposal of the old boiler, and registration. Hidden extras are the most common source of disputes.
- Will you carry out a system flush before installing the new boiler? A system flush removes sludge and debris from your radiators and pipework. Without it, the old dirt can damage the new boiler's heat exchanger and void the warranty.
- What warranty is included? Most boiler manufacturers offer 5 to 10 year warranties, but some require annual servicing by a registered technician to keep the warranty valid. Understand the conditions upfront.
- Should I consider a heat pump instead? If your home is well-insulated, replacing an oil boiler with a heat pump (€6,500 SEAI grant available) may be more cost-effective over 10 to 15 years. A good installer should give you an honest comparison.
Frequently Asked Questions
A new gas condensing boiler costs €2,500 to €4,500 installed, depending on the brand, model, and installation complexity. Oil boiler replacement costs €3,000 to €5,500. A straightforward swap where the new boiler goes in the same location as the old one is at the lower end. Relocating the boiler, upgrading the flue, or modifying pipework adds to the cost. Dublin prices typically run 15-20% above the national average.
Every 12 months, without exception. An annual service by a registered technician (RGII for gas, OFTEC for oil) checks safety controls, cleans key components, measures combustion efficiency, and identifies wear before it causes a breakdown. Annual servicing also maintains your manufacturer's warranty. Most warranties become void if you skip a service. A boiler service costs €80 to €150 and takes about an hour.
A well-maintained boiler typically lasts 15 to 20 years. After 15 years, efficiency declines, parts become harder to source, and the risk of breakdown increases. If you are spending more than €300 per year on repairs, replacement is usually more cost-effective. Some premium boilers last 20 to 25 years with excellent maintenance, but beyond 15 years, you should start planning for replacement.
It depends on your insulation levels and budget. If your home is well-insulated (BER C1 or better), a heat pump is the better long-term investment: lower running costs, SEAI grant of €6,500, and future-proofing against fossil fuel price rises. If your insulation is poor and you cannot afford to upgrade it now, a new condensing boiler is a sensible, practical replacement that will last 15+ years while you plan for a future retrofit.
If you have access to mains gas, a gas condensing boiler is generally cheaper to buy, cheaper to run, and cleaner than oil. Gas boilers are also more compact and easier to maintain. In areas without mains gas (most of rural Ireland), oil is the practical default, though bottled LPG gas is an alternative. Oil prices are more volatile than gas prices, making annual fuel costs less predictable.
A condensing boiler recovers heat from its exhaust gases that a conventional boiler wastes up the flue. This recovery process means condensing boilers achieve 90 to 94% efficiency compared to 60 to 80% for older non-condensing models. All new boilers sold in Ireland must be condensing. If your current boiler is not condensing (check for a white plastic condensate pipe leading from the boiler to a drain), you will see immediate efficiency gains from upgrading.
Not always. If your existing cylinder is in good condition and adequately sized, it can stay. However, if you are switching from a regular (heat-only) boiler to a combi boiler, the cylinder is no longer needed as the combi heats water on demand. Conversely, if you are planning to add a heat pump in the future, you may want a new, larger cylinder now that is compatible with lower-temperature heat pump operation.
Yes. Landlords can claim the cost of boiler replacement as a deductible expense against rental income for tax purposes. The full cost is typically deductible in the year incurred as a repair or replacement of an existing asset. Consult your accountant for confirmation as tax treatment depends on your specific circumstances.
Boiler Replacement & Service Quotes by County
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