How to post a gas boiler replacement job in Ireland
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A boiler replacement is not simply a matter of choosing a new appliance. The installer may need to assess the existing flue, gas supply, controls, radiators, hot-water cylinder, condensate route and ventilation. The right replacement depends on the home and the way hot water is used.
This guide helps you write a useful request and compare proposals. Gas work in Ireland should be carried out by a Registered Gas Installer (RGI), and you should request the relevant certificate after the work is complete.
What to tell the installer
Include the boiler make and model if you can read it from the front panel or service paperwork. Add photos of the boiler, controls, flue exit and cylinder or hot-press area, but do not rely on photos alone to confirm suitability.
- Property type, approximate size and number of bedrooms or bathrooms.
- Whether the current system provides hot water instantly or through a cylinder.
- The symptoms or reason for replacement, such as repeated faults, age, low pressure or poor hot-water recovery.
- Whether you want smart controls, zoning, weather compensation or a system change.
- Your preferred timing and whether the household needs hot water during the workday.
Ask whether replacement is the right option
A professional should explain whether repair, controls, balancing or a replacement is the sensible route. If replacement is recommended, ask for the reason, the proposed output and how the installer has assessed the heat demand rather than choosing the biggest boiler by default.
Ask whether the quote includes system flushing or cleaning, filters, condensate work, flue changes, controls, pipework, disposal of the old boiler and commissioning. These items can make two apparently similar quotes very different.
Registration and certification
Use an RGI for domestic gas work. Check the installer through the RGI register and ask which certificate applies to the work. Keep the certificate, appliance paperwork and commissioning information with your home records. A HomePros listing is not itself proof of RGI status, so verify it directly.
If the job also changes electrics, controls or the consumer unit, ask who is responsible for any electrical work and certification. Keep the scopes separate in the written quote when different trades are involved.
Compare boiler replacement quotes
Compare the model, warranty conditions, output, controls, cylinder or system changes, flue, pipework, commissioning, certification and aftercare. Confirm whether annual servicing is required to keep the manufacturer warranty valid and whether the installer offers it.
- Ask for the exact boiler model and warranty period, not only a brand name.
- Confirm what controls are included and whether app subscriptions cost extra.
- Ask whether the installer has included disposal, scaffolding or access equipment if needed.
- Agree the deposit, payment stages and what happens if additional defects are found.
Frequently asked questions
Who can replace a gas boiler in Ireland?+
Domestic gas boiler replacement should be carried out by a Registered Gas Installer. Check the installer on the RGI register and request the relevant certificate after completion.
Should I replace radiators when replacing a boiler?+
Not automatically. An installer should assess the existing system, heat demand, radiator condition and intended flow temperatures before recommending replacements.
What should I receive after a boiler replacement?+
Ask for the relevant gas safety certificate, commissioning information, appliance warranty documents and instructions for the controls. Keep these records for servicing and future sale or insurance queries.
Sources and editorial notes
Numbered references link claims in this guide to the sources below. Sources were accessed during the article's research or latest material review.
- [1] Registered Gas Installers: Find a registered installer
- [2] SEAI: Find a registered professional
- [3] CCPC: Home improvement and building work disputes
Official guidance and further reading
These links are further reading and do not substantiate every estimate above.
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