Do Plumbers Change Boilers? Simple Answers for Homeowners

If you’ve ever called a plumber for a leaky tap, you might wonder whether the same person can fit a new boiler. The short answer is: not always. While many plumbers have the skills to work on heating systems, installing or servicing a boiler often requires a certified heating engineer.

First, let’s clear up the roles. A plumber is trained to deal with water pipes, drains, and basic gas appliances. A heating engineer, on the other hand, has specific training for boilers, central heating, and gas safety. In the UK, heating engineers need a Gas Safe Register licence to work on gas‑fired boilers. Without that licence, they’re not legally allowed to do the job.

When a Plumber Can Help

If your boiler is already installed and you just need a leak fixed, a plumber with gas‑qualified experience can usually handle the repair. Many plumbing businesses employ engineers who hold both plumbing and gas qualifications, so they can diagnose a faulty valve, replace a pump, or bleed radiators.

For routine maintenance like cleaning the heat exchanger or checking the pressure, a qualified heating engineer is the safe bet. They’ll follow the manufacturer’s schedule and keep your warranty valid. Skipping the right professional could void the warranty and lead to expensive fixes later.

When You Need a Certified Heating Engineer

Any full boiler replacement or new installation must be done by a Gas Safe registered engineer. This isn’t just a rule—it’s a safety requirement. Incorrect installation can cause carbon monoxide leaks, gas explosions, or inefficient heating, which can cost you money and risk your health.

Ask your contractor for their Gas Safe registration number before any work begins. Check the number on the official Gas Safe website to confirm it’s current. A reputable engineer will provide a written quote, explain the work, and guarantee their service.

Also, be aware of local building regulations. Some councils require a notified building control body to approve new boiler installations, especially if you’re switching fuel types or upgrading to a high‑efficiency model.

In practice, many plumbing firms partner with certified heating engineers, so you can call the same company for both services. The key is to confirm the qualification of the person who will actually do the boiler work.

Bottom line: a plumber can fix minor gas‑related issues on an existing boiler, but for installation or major repairs you need a Gas Safe registered heating engineer. Always verify credentials, ask for a clear quote, and don’t cut corners on safety. Your home’s heat and your peace of mind depend on it.

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