Can I move my boiler to a different room?

Yes, in most homes you can move a boiler to a different room. The new spot needs a safe route for the flue to carry fumes outside, plus room to run the gas pipe, the water pipes and a drain for the boiler's waste water. The work must be done by a Gas Safe registered engineer.

This post explains where a boiler can and can't go, what makes a move simple or involved, and the rules and paperwork that come with it. Moving a boiler means moving gas pipework and a flue, so none of it is a DIY job, but knowing what's involved helps you plan and ask the right questions.

Why people move their boiler

Most moves happen alongside other work in the home. Common reasons include:

• freeing up a kitchen cupboard when a new kitchen goes in
• moving a noisy boiler away from a bedroom or living room
• building an extension that would cover the wall the flue comes out of
• swapping a regular boiler, with tanks in the loft, for a combi boiler that heats water on demand

The extension point matters for safety. A flue left inside a new room can let carbon monoxide, a poisonous gas you can't see or smell, build up in the house. If you're planning building work, talk to a heating engineer before the walls go up, not after.

Where a boiler can usually go

Modern boilers are room-sealed. That means they draw air from outside and send fumes out through the flue, rather than using the air in the room. This is why they can be fitted in far more places than older boilers.

Common new homes for a boiler are a utility room, a kitchen or hallway cupboard, an airing cupboard, a garage or the loft. A loft needs safe access for servicing and repairs, which usually means a fixed loft ladder, a boarded path, a light and a guard around the hatch. Most manufacturers ask for these in their fitting instructions. A garage or loft also needs the pipes protected from frost.

A boiler can sometimes go in a bathroom, but only in the parts of the room the wiring regulations allow, away from the bath and shower. Wherever it goes, it needs the clearances around it that the manufacturer sets, so an engineer can reach it to service it.

The flue often decides where the boiler goes

The flue is the pipe that carries the boiler's fumes outside. Where it can come out of the house often decides where the boiler can go.

The end of the flue, called the terminal, has to sit set distances away from windows, doors, air bricks, gutters and boundaries. These distances come from the Building Regulations and the boiler maker's instructions. Each boiler also has a maximum flue length, so a boiler can only sit so far from an outside wall or roof.

If the flue has to run through a ceiling or behind a stud wall, it needs inspection hatches along it. Gas Safe Register's guidance asks for these so that every future engineer can check the hidden flue is sound. It's worth knowing early, because hatches mean a little extra building and decorating work.

The pipes that have to follow it

A boiler needs several pipes, and all of them have to reach the new spot:

• the gas supply, which may need a wider pipe if the run gets longer, so the boiler gets enough gas
• the heating flow and return, the pipes that carry hot water to the radiators and back
• the cold mains in and, on a combi, the hot water out to your taps
• the condensate pipe, which drains the slightly acidic water a modern boiler makes as it works

The condensate pipe needs a steady fall to a drain. A route inside the house is better where possible, because pipes that run outside can freeze in cold weather and stop the boiler. Floors may need lifting to run new pipes neatly, which is part of why some moves take longer than others.

Rules, paperwork and who can do the work

By law, only a Gas Safe registered engineer can move or fit a gas boiler. You can ask to see their Gas Safe ID card, and check it on the Gas Safe Register website.

Fitting a boiler in a new place is notifiable work under the Building Regulations. Your engineer notifies it through Gas Safe Register, and you should then receive a Building Regulations compliance certificate by post. Keep it with your boiler paperwork, because a buyer's solicitor will usually ask for it when you sell.

The boiler also needs a new electrical supply in its new spot. That must be fitted safely and to the wiring regulations.

Is it better to move it when you replace it?

If your boiler is getting on, it usually makes sense to move it at the same time as replacing it. A new boiler normally needs a new flue anyway, and much of the pipework is being changed. Moving an old boiler means paying for the move now and much of the same work again when it's replaced.

The cost of a move depends on how far the boiler is going, how the flue will get out, how many floors and walls the pipes cross, and how much making good is needed afterwards. If you're also changing boiler type, our guide to choosing between a combi, system or regular boiler explains how each one affects the space you need.

What we look at on a survey

When we survey for a new or moved boiler, we look at the spot you'd like, the flue route, the gas pipe run back to the meter and where the condensate can drain. We then explain what makes your job simple or more involved before any work starts. Our step-by-step guide to a boiler installation walks through what happens from survey to handover.

If you're thinking about moving your boiler, Solve Heating Services Ltd can visit your home in Hampton or nearby, look at where it could go and talk you through the options. You can find out more and arrange a visit on our boiler installations page.