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Typical costs
Most homes in Ireland replacing an existing gas boiler with a modern condensing combi boiler pay between €2,800 and €4,500, including the boiler, labour, a new flue, controls and VAT. Oil boilers cost a little more because of the burner and tank connections.
| Job | Typical cost (inc. VAT) |
|---|---|
| Like-for-like gas combi swap | €2,800 – €3,600 |
| Gas system or regular boiler | €3,200 – €4,500 |
| Oil boiler replacement | €3,500 – €5,000 |
| Moving the boiler to a new location | + €600 – €1,500 |
| System power flush | €350 – €600 |
| Smart thermostat and zoned controls | €250 – €700 |
Sample figures for design. Verify current market prices before publishing.
What affects the price
- Boiler type and output. Larger homes or homes with two bathrooms may need a system boiler and cylinder rather than a combi.
- Location. Keeping the boiler where it is avoids new pipework and flue routes.
- Condition of the system. Sludge in older radiators may need a power flush before a new boiler's warranty is valid.
- Controls. Upgrading to zoned heating or smart controls adds cost but can cut running costs.
- Timing. Emergency replacements in mid-winter can cost more and give you less choice.
Gas, oil or heat pump?
If your boiler is failing, it's a good moment to consider whether a like-for-like replacement is still the right choice.
Replacing like for like
The quickest and cheapest option up front. A modern condensing boiler is considerably more efficient than one from the early 2000s.
Switching to a heat pump
Costs more to install and works best in well-insulated homes, but can cut running costs and carbon emissions significantly. A heat loss survey will tell you whether your home is ready. See our heat pump cost guide.
Grants
Grants are generally not available for replacing a gas or oil boiler with another fossil-fuel boiler. SEAI supports heat pumps, insulation and other energy upgrades. Check seai.ie for current schemes and amounts before you commit.
Questions to ask your installer
- Are you RGII registered, and will I get a Declaration of Conformance? (Gas work only.)
- Which boiler are you recommending, and why that size?
- What warranty comes with it, and what do I need to do to keep it valid?
- Does the quote include the flue, controls, flushing, removal of the old boiler and VAT?
- How long will I be without heating and hot water?
Red flags
Be cautious if an installer:
- asks for full payment before starting
- won't give a written, itemised quote
- can't show an RGII number for gas work
- pressures you to decide on the spot
FAQs
How long does a boiler last?
Do I need to be at home during installation?
Can I fit a boiler myself?
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This guide is general information, not professional advice. Prices vary by location and job. Always get written quotes.