Does a boiler flue need to be accessible?

As the flue removes fumes from the boiler, it needs to be accessible for inspection. A blocked flue, or one in poor condition, could put you at risk of carbon monoxide poisoning (although being unable to access the flue doesn’t automatically mean that it is unsafe).

What is a room sealed boiler flue?

What is a room sealed flue system? In a room sealed flue system combustion air supply is drawn via ducts from an outside air supply. Room sealed appliances reduce the risk of flue gases spilling back into the plantroom due to poor flue operating conditions.

Is a balanced flue boiler room sealed?

A room sealed flue (sometimes referred to as a balanced flue) consists of two ducts, one inside the other. The fresh air for combustion is taken into the boiler via the outer duct and the exhaust gas is usually discharged outside by the inner duct. The flue terminal may only be fitted on an external wall.

How do you seal a gas boiler flue?

Sealing around a boiler flue traditionally requires pointing with sand and cement. Removing any need for pointing, FlueSnug can be installed in less than five seconds and snuggly fits the 152mm core-drilled hole in the wall through which the boiler pipe and flue exits.

Can I put my gas boiler in a cupboard?

This means that a kitchen cupboard is the perfect thing to house your boiler because it will have a door that can open. As standard, most boilers will require a gap of at least 50 mm between the appliance and the cupboard. These boilers can also go into a small bathroom, an unused airing cupboard or a bedroom wardrobe.

What comes out of a condensing boiler flue?

The boiler flue is essentially the boiler’s chimney, but instead of smoke and soot being channelled away from the inside of the home, it’s mainly carbon dioxide and water vapour that’s emitted. It’s the reason all households should have a carbon monoxide alarm as well as a smoke alarm.

What’s the difference between open flue and room sealed?

In room sealed systems, such as condensing boilers, the combustion air is supplied from the outside. Open flue systems on the other hand draw the combustion air from within the installation room.

What is the difference between a balanced flue and an open flue?

A balanced flue – or ‘closed’ system – has one significant difference to an open flue. Instead of drawing in clean air from your room, it takes it in from outside the house, via a pipe. The same pipe that takes in the air from outside also removes the waste air.

Can you seal a boiler flue with expanding foam?

If during installation Gas Safe registered engineers are unable confirm the suitability a sealant, e.g. an expanding foam product or silicone, from both the boiler and sealant manufacturers then the sealant product should not be used.

What do you use to seal the flue pipe?

Seal the gap between the flue and metal flashing with special high-temperature caulk. Don’t use spray foam. Form an insulation dam to prevent insulation from contacting the flue pipe. Cut enough aluminum from the coil to wrap around the flue plus 6 inches.

Will I have to replace my gas boiler in 2025?

The UK has relied on gas and oil based central heating since the 1930’s. In 2025, gas boilers will be replaced by renewable heating systems in all new-build homes. This is part of a government effort to achieve net-zero CO2 emissions by 2050.

What is a room sealed boiler flue system?

Room sealed type C1. A type C appliance that is designed for connection via its ducts to a horizontal terminal, which at the same time admits fresh air to the burner and discharges the products of combustion to the outside through openings that are either concentric or close enough to come under similar wind conditions.

Can a flue be used on a condensing boiler?

When changing commercial boilers from atmospheric boilers to condensing boilers the existing flues on this type of system are not able to deal with the modern pressurised and wet system where condensate will form.

How does a concentric flue system work in a boiler?

A concentric flue system provides a very compact room sealed flue, where the air supply and flue gases are managed within a one-piece concentric duct system. Typically using a duct within a duct, flue gases are expelled through the inner duct with combustion air being drawn in via the outer annulus.

Are there any flue systems for Hamworthy boilers?

Our commercial boilers and water heaters are suitable for many flue systems and we can provide flue components to suit these schemes. Here we look at the types of flue systems available and which types are suitable for Hamworthy boilers and water heaters.