Cost of a New Boiler in Ireland 2026

Replacing a boiler is one of the most significant home maintenance costs Irish homeowners face. Get the timing and choice right and it will heat your home reliably for 15 years. Get it wrong and you are looking at another replacement sooner than expected.

Here is a complete breakdown of boiler costs in Ireland for 2026, including supply and fit prices, labour-only rates, what affects the price, and SEAI grants that may be available.

How much does a new boiler cost in Ireland?

The total cost of a new boiler installation in Ireland ranges from approximately €2,200 to €4,500 for gas boilers on a supply-and-fit basis. The wide range is driven by:

• Type of boiler (combi, system, conventional)
• Whether the swap is like-for-like or requires pipework changes
• Location of the boiler (utility room, hot press, kitchen)
• Age and condition of the existing system
• Whether you are switching from one boiler type to another

Gas combi boiler (supply and fit)

Typical cost: €2,200–€3,200

A combi boiler is the most popular choice for Irish homes. It heats water on demand — there is no hot water cylinder — and is suited to homes up to approximately 130–150 sq m with one or two bathrooms.

A like-for-like combi-to-combi replacement is the most straightforward job. Expect one day’s work and a total cost of €2,200–€3,200 including the boiler and installation.

Gas system boiler (supply and fit)

Typical cost: €2,800–€4,000

A system boiler works with a hot water cylinder. Better for larger homes with multiple bathrooms, or homes where simultaneous hot water demand from multiple outlets is common.

If you are upgrading from a back boiler (the unit behind a fireplace), expect to pay toward the upper end of this range, as the back boiler needs to be removed and new pipework installed.

Oil boiler (supply and fit)

Typical cost: €3,000–€4,500

Oil boilers are standard in Irish homes off the gas network — large portions of rural Ireland, plus some suburban areas. The boiler itself costs more than a comparable gas unit, and OFTEC registration is required for installation (equivalent to RGII for oil).

If you are in an oil-heated home, the SEAI grant for replacing an oil boiler with a heat pump is worth investigating (€6,500 for the heat pump). The payback period depends heavily on oil vs electricity price differentials.

Labour-only (fit-only)

Typical cost: €600–€900

If you supply the boiler yourself — perhaps you bought it online or from a builder’s merchant — the labour to fit it runs €600–€900 for a like-for-like swap.

Be aware that if you supply the boiler and it develops a fault, the installer will not take responsibility for the unit itself, only the installation. Manufacturer warranties may also be voided if the boiler is not installed by an authorised installer. Verify with the manufacturer before going this route.

What affects the price of a new boiler?

Like-for-like vs boiler type change

The cheapest installation is replacing a combi with a combi, or a system boiler with a system boiler, in the same location. No pipework changes, no additional materials, minimal labour.

Switching from a system boiler to a combi means removing the hot water cylinder and associated pipework. Switching from a back boiler to a combi means removing the fireplace unit. Both add cost and time.

Location of the boiler

Moving a boiler from one room to another — say, from the kitchen to a utility room — requires running new gas, water, and flue pipes. Add €500–€1,500 to the standard installation cost depending on the distance.

Flue

Most like-for-like replacements can reuse the existing flue. If the new boiler requires a different flue type or a new flue route, this adds cost. External wall thickness and proximity to windows and doors can complicate flue placement.

System flush

Before a new boiler is connected to an older system, the heating circuit should be flushed to remove scale, sludge, and inhibitor residue. This is either a powerflush (approximately €400–€600, done by the installer using specialist equipment) or a chemical flush (included in some installations, cheaper but less thorough).

Fitting a new boiler to an unflushed system is a false economy. The sludge will reduce efficiency and shorten the life of the new boiler. Most reputable installers will either include a flush or strongly recommend one.

Magnetic filter

A magnetic filter (such as a Fernox TF1 or Adey Magnaclean) fitted to the return pipe catches metallic debris before it reaches the boiler heat exchanger. These cost €80–€150 fitted and significantly extend boiler life. Worth doing with any new installation.

SEAI grants and new boilers

The SEAI Better Energy Homes scheme does not offer grants for new gas boiler installations. The scheme focuses on low-carbon and renewable technologies.

However, if you are considering switching from a gas or oil boiler to a heat pump, the following SEAI grants apply:

Measure	Grant
Air-to-water heat pump	€6,500
Solar water heating	€1,200
Attic insulation	€1,500
External wall insulation	€8,000

A heat pump installation costs €12,000–€18,000 before grants. After the €6,500 grant, the net cost is €5,500–€11,500. The running cost savings versus gas (depending on tariff) typically yield a payback of 8–15 years.

If your home is well-insulated (BER B3 or better), a heat pump is worth serious consideration at replacement time. If your home is poorly insulated, address the insulation first or the heat pump will be inefficient.

Annual boiler service

Typical cost: €80–€120

A gas boiler should be serviced annually by an RGII-registered engineer. The service includes cleaning the burner and heat exchanger, checking combustion efficiency, inspecting the flue, and testing safety devices.

Regular servicing keeps the boiler running at peak efficiency, identifies small problems before they become expensive failures, and is typically required by the boiler manufacturer to maintain the warranty.

An unserviced boiler runs less efficiently. Even a 5% efficiency drop costs approximately €80–€100 per year in additional gas costs for a typical Irish home — roughly the cost of a service.

How to avoid being overcharged

Get three written quotes

Not to find the cheapest, but to understand the range. If one quote is significantly higher or lower than the others, ask why. Cheap is not always bad — a sole trader with lower overheads can legitimately charge less. But a price that is 40% below the other quotes needs an explanation.

Understand what is included

The most common source of disputes is scope. Make sure the quote explicitly states: whether the old boiler removal is included, whether a system flush is included, whether the magnetic filter is included, and whether commissioning and the RGII cert are included.

Check RGII registration

All gas boiler installation work requires RGII registration. Verify the plumber’s registration number at rgii.ie before signing anything.

Check insurance

Ask for a copy of their public liability insurance certificate. If they will not provide it, find someone else.

About the author

Dave Coleman is a web developer and SEO specialist based in Dublin. He built plumbersinireland.ie in partnership with Ranksy, the Irish tradespeople platform at ranksy.ie.