A new gas boiler cost in Ireland in 2026 typically falls between €2,200 and €4,500 fully fitted, depending on the model, the size of the home, and how much pipework or flue alteration is needed.

Prices have crept up over the last two years because of material costs, tighter building regulations, and the shift to high-efficiency condensing units. The good news is that a well-installed A-rated boiler will typically knock 20% to 30% off your annual gas bill compared to a 15-year-old model.

Below you’ll find a proper breakdown of what you’re actually paying for, why quotes vary so much between installers, and the questions to ask before signing anything.

What Does a New Gas Boiler Cost in Ireland in 2026?

Most Irish homeowners pay between €2,200 and €4,500 for a fully installed gas boiler in 2026. A simple like-for-like combi swap in a 3-bed semi usually lands around €2,600 to €3,200. A larger system boiler with hot water cylinder and smart controls can push past €4,500.

Here’s a rough guide to what you can expect to pay in Dublin and the greater Leinster area:

• Combi boiler swap (like-for-like): €2,200 to €3,000
• Combi boiler with system upgrade: €3,000 to €3,800
• System boiler with cylinder: €3,200 to €4,200
• Full heating system overhaul: €4,500 to €6,500
• Boiler relocation (moving position): add €400 to €900

Those figures include the boiler itself, standard flue kit, labour, minor pipework, commissioning and the gas safety certificate.

What’s Included in a Gas Boiler Installation Quote?

A proper installation quote should itemise every line so you know exactly where your money is going. If you get a one-line quote saying “boiler fitted €3,000”, ask for a written breakdown before you agree to anything.

The Boiler Unit Itself

The boiler alone usually accounts for 40% to 55% of the total cost. A quality A-rated 24kW combi from a well-known manufacturer will cost the installer somewhere between €1,100 and €1,700 at trade price. Bigger 30kW or 35kW units cost more, as do system boilers designed to work with a hot water cylinder.

Labour and Fitting

Labour for a standard swap is typically €600 to €900 for a one to two day job. A full system change with pipework alterations can take three days and push labour past €1,500. RGI-registered installers charge more than unregistered fitters for very good reasons, which we’ll come to shortly.

Ancillaries and Legal Materials

These are the bits people forget. A compliant install needs a magnetic system filter, new isolation valves, condensate pipework, a flue kit sized for your property, and often a scale reducer if you’re in a hard water area. Budget €250 to €500 for these together.

Controls and Thermostats

A basic programmable thermostat is around €120 fitted. Smart controls with zoning and app control run from €250 to €600 depending on the number of zones. Modern controls pay for themselves in fuel savings within two or three winters.

What Factors Push the Price Up or Down?

Two homeowners on the same street can get quotes €1,500 apart for what sounds like the same job. The reason is that every property is different and every quote reflects a different scope of work.

Here are the factors that move the needle most:

• Boiler type and output: combi units are cheaper to install than system boilers with cylinders
• Existing pipework condition: old imperial copper often needs replacing to modern 22mm sizing
• Flue routing: a straight horizontal flue is cheap, a vertical flue through a roof adds €300 to €600
• Gas supply pipe size: older 15mm supplies often need upgrading to 22mm for modern high-output boilers
• Power flush requirement: a system full of black sludge needs flushing before a new boiler goes on, adding €350 to €500
• Location within the home: attic and awkward-access installs take longer and cost more
• Removal and disposal: proper disposal of the old boiler and any asbestos flue seals adds cost

If your quote is significantly cheaper than others, the installer has usually left something out. Ask specifically about the filter, flush, controls and gas certificate.

Are There Grants for a New Gas Boiler in Ireland?

There is no direct SEAI grant for replacing a gas boiler with another gas boiler in 2026. Grants under the SEAI home energy grants scheme are targeted at heat pumps, insulation, solar PV and other measures that cut fossil fuel use rather than continue it.

That said, there are still ways to reduce the overall cost of a heating upgrade:

• Heating controls upgrade grant: up to €700 for qualifying smart controls when done alongside other works
• One Stop Shop grants: if you’re doing a deeper retrofit, you can bundle multiple measures for a bigger overall grant
• Heat pump grant: up to €6,500 if you’re willing to switch from gas to a heat pump instead

For most homeowners doing a straight boiler swap, the grants don’t apply. But if your boiler is over 15 years old and your home is poorly insulated, it’s worth getting a BER assessment first. Sometimes a heat pump plus insulation works out better long-term than another gas boiler.

Why Does RGI Registration Matter for the Price?

Every gas boiler installation in Ireland must legally be carried out by a Registered Gas Installer. This is not optional. Using an unregistered fitter is illegal, invalidates your home insurance, and creates real safety risk from carbon monoxide.

An RGI-registered installer will:

• Notify the works to the RGII and issue you a Declaration of Conformance
• Carry out a flue gas analysis and commissioning on completion
• Fit a carbon monoxide alarm if one isn’t already in place
• Provide the manufacturer’s warranty registration (usually 5 to 10 years)
• Carry full public liability insurance for the work

Warranty Length Matters Too

Most quality boilers come with a 5-year manufacturer warranty as standard, extending to 7 or 10 years when installed by an accredited fitter and serviced annually. That warranty is worth several hundred euro over the lifetime of the unit, so factor it into the price comparison.

How to Get the Best Value on a New Boiler

Getting three written quotes is the single best thing you can do. Compare like for like on the boiler brand, output, controls, ancillaries and warranty. Cheapest is rarely best value once you factor in warranty length, installer experience and workmanship.

A few practical tips before you commit:

• Ask for the boiler make, model and kW output in writing on the quote
• Confirm the installer is RGI registered and ask for their registration number
• Check whether a power flush is included or extra
• Get the warranty terms in writing, including annual service requirements
• Ask about aftercare and whether the same installer handles servicing

If your existing boiler is still working but sluggish, an annual gas boiler service can add three to five years of life while you plan a proper replacement. That gives you time to save, compare, and avoid an emergency swap at premium winter prices.

Ready to Get a Real Quote?

A gas boiler is a 12 to 15 year investment, so it pays to get it right the first time. The cheapest quote almost always ends up being the most expensive one two winters later.

If you’d like an honest, itemised quote for a new gas boiler in Dublin or the surrounding areas, get in touch with the team for a free home survey and written breakdown.