Gas and heating

Gas boiler service

The annual service on a gas boiler, including the checks a landlord needs on record.

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Whether this needs a licence in Ireland

Ireland

Licence required

Registered Gas Installer (RGI)

Registered Gas Installer (RGI), issued or supervised by the Commission for Regulation of Utilities. Ask for the registration number before the work starts and check it on the public register. Check the register: www.rgi.ie

Wording approved by Talqero; not yet reviewed by a solicitor

Commission for Regulation of Utilitieswww.rgi.ieChecked 11/10/2026

Gas boiler service: what the job involves

The annual service on a natural gas or LPG boiler by a Registered Gas Installer: cleaning and checking the burner, testing combustion and safety devices, and leaving a Declaration of Conformance. Landlords use it as their record that the boiler is safe.

Also asked for as: RGI boiler service · annual boiler service · gas cert for landlord · combi boiler service · gas safety check

How the job is usually done

Check the RGI card, then ask about any faults, pressure loss or noises since the last service.
Run the boiler and measure flue gases with a combustion analyser before opening it up.
Isolate, open the case, inspect and clean the burner, heat exchanger, fan and condensate trap.
Check seals, the flue and its terminal, ventilation, gas pressure and the safety devices.
Reassemble, recommission, and recheck combustion readings and system pressure.
Complete the Declaration of Conformance and note anything that needs repair.

Gas boiler service: what is included

Usually included

Inspection, cleaning and combustion analysis of the boiler
Flue, ventilation and gas tightness checks
The Declaration of Conformance (Cert 3)
Topping up system pressure on a sealed system

Usually not included — agree it separately

Replacement parts such as a fan, valve, igniter or PCB
Power flushing or bleeding every radiator
Servicing a gas fire or cooker unless booked at the same visit

Materials and who supplies them

Seals and gaskets for the service, carried by the RGI
Replacement parts, quoted separately if needed

How long it takes

Usually about an hour; longer for an older boiler, one that fails combustion checks, or when a part has to be fitted the same day.

When to book

Book the service in late spring or summer, when RGIs are less busy and problems are found before the first cold week.

Gas boiler service: the rules in Ireland

What the official sources say, checked against them on the date shown. A summary, not legal advice — follow the link to read the rule itself.

Only a Registered Gas Installer may install, replace, alter, repair or service a gas appliance or gas pipework in a home, whether natural gas or LPG. Every RGI carries a photo ID card renewed each year, and can be checked on the register.
Applies to: the installer, and the homeowner who engages one
Energy (Miscellaneous Provisions) Act 2006; Register of Gas Installers of Ireland for the Commission for Regulation of Utilities · rgi.ie · Checked 9 October 2026
An RGI must issue a Declaration of Conformance (completion certificate) for all gas works and give the customer the original copy as soon as the work is finished. A service, safety check, repair or appliance fit is recorded on a Cert 3; a boiler replacement on a Cert 2.
Applies to: the installer
Energy (Miscellaneous Provisions) Act 2006; Register of Gas Installers of Ireland · rgi.ie · Checked 9 October 2026
A landlord must keep gas, oil and electrical installations and heating appliances in good repair and safe working order, and provide a carbon monoxide alarm where required.
Applies to: the landlord
Housing (Standards for Rented Houses) Regulations · gov.ie · Checked 9 October 2026
The Commission for Regulation of Utilities is the safety regulator for gas installers and supervises the RGI register.
Applies to: gas installers
Commission for Regulation of Utilities · cru.ie · Checked 9 October 2026

What gas boiler service costs, and why

What jobs on Talqero came to

Not enough comparable jobs yet to publish a range here. Talqero shows a price range only once at least five comparable jobs, agreed prices or offers exist — a range from fewer would describe a handful of jobs, not the market. Post your job and compare the offers you get.

What affects the price

Boiler type: combi, system or regular, and its age and make
Natural gas or LPG
Parts needed if the service finds a fault
Additional appliances serviced at the same visit
Winter demand and out-of-hours visits
VAT: building work on a home is charged at the reduced rate of 13.5% by a VAT-registered business — unless the materials come to more than two-thirds of the price, when Revenue’s two-thirds rule applies the goods rate to the whole job. Ask whether a quote includes VAT.

Paperwork to ask for at the end

Declaration of Conformance (Cert 3) for the service, original copy
Combustion analyser printout or readings
A written note of any defects and their urgency

Safety

Have a working carbon monoxide alarm near the boiler and in sleeping areas.
Signs of a problem include a yellow or lazy flame, soot around the case, condensation in the room or headaches that ease when you leave the house.
If you smell gas, call 1800 20 50 50 before booking anything.

Gas boiler service: before you hire

Questions to ask a tradesperson

May I see your RGI card?
Will you leave me a Declaration of Conformance today?
Does the service include a combustion analysis printout?
If you find a fault, will you quote before fitting a part?

What you can do yourself

Never open a gas boiler yourself; a householder can safely top up pressure on a sealed system using the filling loop as the manual describes and bleed radiators.

What to put in your task

What kind of boiler is it?
Is it mains gas or LPG from a tank or bottles?
When was it last serviced?
Any problems at the moment?
Is this a rented property?

Photos that help

The boiler with the front panel and the make and model label in view
Any error code on the display
The flue where it leaves the wall or roof outside

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Questions about gas boiler service

Does gas boiler service need a licence in Ireland?

Yes. Registered Gas Installer (RGI), supervised by the Commission for Regulation of Utilities. Source: www.rgi.ie. Ask for the registration number and check it on the public register. Wording approved by Talqero; not yet reviewed by a solicitor.

Is an annual boiler service a legal requirement?

For an owner-occupier it is strongly recommended rather than a statutory requirement. Landlords must keep gas installations in safe working order, and an annual service with a Declaration of Conformance is the usual way to show it. Many manufacturer warranties also require one.

What certificate should I get?

An RGI must give you a Declaration of Conformance for the service, the Cert 3. Ask for the original copy before they leave.

How do I know the person is a real RGI?

Ask to see the photo ID card, which shows a registration number and is renewed each year, and check it on the RGI register online.

Often booked with gas boiler service

Heating engineers