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Boiler Flues in Portsmouth

To comply with Gas Safe regulations, a boiler flue must be fitted to every boiler. It is a necessary piece of equipment that prevents a buildup of steam and safely disperses potentially toxic fumes to the outside of your home. Several factors can impair the flue’s performance and can even provide warning signs that your boiler isn’t working correctly. Regular boiler servicing is the most sensible way to know if your boiler and boiler flue are operating safely. If you suspect your boiler flue is not in the best of condition, give the Portsmouth heating experts at No1PHD a call without delay.

Signs of a Faulty Boiler Flue

One of the main functions of a boiler flue is to release the steam from the boiler. Occasionally, the exterior terminal guard may be loose or ill-fitting, causing the water vapour to return to the flue. A pool of water remaining in the flue can quickly lead to damaging corrosive rust. If the gas valve inside the boiler is not set correctly, too much oxygen may be drawn in resulting in a much larger flame than usual. The flue can become scorched to the point of a hole forming and leave signs of soot around it. Excessive soot can cause a blockage in the burners, leading to poisonous carbon moxide being released inside your home. Your boiler and the boiler flue need prompt attention from the Portsmouth heating engineers at No1PHD to ensure the equipment is safe.

  • Loose terminal guard
  • Pool of water
  • Rust
  • Larger than average flame
  • Scorching
  • Soot

How Old is Your Boiler Flue?

The shape of your boiler flue often indicates the approximate age of an existing boiler installation. A round flue has usually been fitted in the last twenty years and indicates that the boiler has its gas supplied through 22mm pipes that comply with current regulations. A square flue is a much older version that could have an outdated 15mm gas pipe. When the flue needs replacing, it will probably require new pipework to ensure it complies with gas supply legislation. If this seems to be the case, call us on 01425 208031 for a free quotation and callout.

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Couldn’t have asked for a faster resolution to our drainage conundrum. Nothing was too much for these guys who were brilliant throughout.

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Different Types of Flue

When considering a new boiler installation from the Portsmouth No1PHD heating team, the location of your boiler will influence the type of flue it will have. To ensure efficiency, the flue should be as short as possible.


Horizontal Boiler Flue

Most boilers are installed on a wall leading to the outside of your home to allow the flue a convenient exit point of just a few inches. It also has to be at least twelve inches from a door, window or air vent to prevent steam or fumes re-entering your home.


Vertical Boiler Flue

Some boilers are fitted on an interior wall and require a vertical boiler flue. This protrudes up from the roof of your home and resembles a drainpipe. Depending on its length and location, a vertical boiler flue can be more expensive and difficult to install.

Portsmouth Boiler Flue Services from No1PHD

It is important to have your boiler and the boiler flue serviced regularly to ensure the equipment is working correctly. To keep your family safe, arrange for an affordable annual boiler service from the Portsmouth team of experienced heating engineers at No1PHD by calling 01425 208031.

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After noticing that the house was unusually cold, we found that the heating wasn’t coming on and that our hot water had also failed. We called the team at No 1 PHD who dispatched an engineer to investigate. After discovering that the culprit was a faulty boiler part, they ordered in a new part and got it fitted as quickly as possible. The guys were great, and we couldn’t be happier.

Mr Lincoln

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For days, we’ve noticed a foul smell coming from outside and a gurgling sound coming from one of the drains. Whenever it would rain, the area around it would flood slightly and take ages to drain. We tried buying drain unblockers, but none seemed effective. Eventually, we turned to No 1 PHD and were left wondering why we didn’t do this sooner.

Mrs Griffin

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