How close can a boiler flue be to a boundary?

The only definitive “rule” for flue siting is in Approved Document J of the Building Regulations, which specifies that a fan-assisted, balanced flue, for any type of boiler, should be a minimum of 600mm “from a surface or a boundary facing the terminal”.

With regard to proximities to boundaries, a flue duct outlet of a gas appliance needs to be sited so that it is at least 600mm from the boundary line when facing it and at least 300mm from the boundary line when running parallel to it.

Secondly, are fumes from a boiler flue dangerous? Boiler flues are a crucial part of your heating system. They are a way for combustion fumes that have been created by your boiler to be released outside the home. If your boiler isn’t burning the gas correctly, carbon monoxide could be produced too. Boilers are made to be safe, and these gases shouldn’t harm you.

Similarly one may ask, how far does a boiler flue have to be from a door?

Flue position Depending on the size of the boiler, the flue must be positioned a certain distance from the nearest window, door, or air brick. Typically this is around 30-60cm if it’s to the side or above the opening, and a bit more if it’s below.

Can you move a boiler flue?

All boilers use a flue system but if your boiler is no longer in production, you may not be able to find the right flue – and you can‘t reuse your old one. Without a new flue, you won’t be able to move your current boiler. Ultimately, moving an old boiler can end up almost as expensive as fitting a new one.

Are flue gases dangerous?

The gases that the boiler flue disperses outdoors, including carbon monoxide, are potentially harmful, which is why the regulations surrounding them are getting stricter. Boiler flue regulations ensure that the gases being expelled don’t re-enter the home, which would instantly make the flue redundant.

How long should a flue pipe be?

Maximum overall length of straight pipe: 3 m (10 ft.) The assembly should be as short and direct as possible between the stove and chimney. The use of two 45 degree elbows is often preferable to a single 90 degree elbow because less turbulence is created in the exhaust flow and they result in less horizontal run.

Does a boiler flue have to be straight?

Vertical Boiler Flue Layout Not every home has an outside wall suitable for mounting a flue terminal. In this case a vertical flue may be required, which is likely to go through the roof of a property. General guidance is that the flue should be as short and as straight as possible.

How do you tell if your boiler flue is blocked?

Step 1 – Check Inside the Heater Wipe around the edge of the pipe using a cloth. If it appears oxidized, or there are white stains around the mouth of the flue, this can indicate that it is blocked. You may also notice a bad smell, or have your carbon monoxide alarm sound, if you have one.

How high does a boiler flue have to be?

The regulations differ for most boiler models depending on their size, but the typical guide is that the flue needs to be at least 30cm away from an opening, such as a window, if it is to be placed above or to the side of said opening.

Can a boiler flue go through a roof?

As well as being installed horizontally, flues can be installed vertically through a roof, but come with their own issues. If you’re getting one installed, make sure that you’re kept informed by a professional. The flue has limited access if it’s installed vertically.

What comes out of the boiler flue?

By definition, a boiler flue is a duct or pipe for the expulsion of exhaust gases from a heating system or generator. In English – It’s a pipe from your boiler to the outside of your house so the waste gases and condensation from your heating system aren’t being pumped into your home – pretty important.

How long can a combi boiler flue be?

For example, a 60/100mm concentric flue fitted to a system or combi boiler can be a maximum of 10m long. If the installation needs the flue to run for a distance above this, the installer can increase the flue size to 80/125mm, allowing for a maximum length of 20m.

How many bends can a flue have?

A chimney cannot have more than four bends and no bend can be more than 45 degrees (except if you use a 90 degree “T” off the rear of the stove). If you are are going out through a wall then you will be using two 45 degree bends straight away and have two left if you need them.

Does boiler have to be on external wall?

It should be positioned on or next to an outside wall because by regulation all new boilers installed in a property have to be condensing, which means they generate condensation and a discharge pipe is therefore necessary.

What does a flue do?

A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself.

Why do you need a flue guard?

2 Answers from MyBuilder Gas Engineers I flue terminal below which is within 2 meters of the floor is required to have a guard around it. The ideal is to stop people touching it or trying to but things into it. Yes it should have fitted with a guard if within 2 meters of the floor or as per manufacturers instructions.

Does a condensing boiler need a flue?

If it is plastic and white steam comes out of it when the boiler is on then it is likely to be a condensing boiler. Non-condensing boilers normally have a metal flue and the gases may not be visible because they’re much hotter than those from a condensing boiler.