How does a balanced flue work in a condensing boiler?

In the case of a gas condensing boiler, the balanced flue contains two tubes: one tube lets oxygen in, the other tube lets waste gases out. In this situation, the boiler doesn’t pull oxygen from your house but from outside.

Which is better balanced flue or fan flue?

If your boiler has an existing balanced flue a large square flue through to the outside it will rely on natural draft and is often called RS (or room sealed). Updating the flue system with a fan flue will make the boiler more efficient, but only requires a 100mm circular flue. This means youre often left with a large hole to brick up and make good.

What kind of flue do I need for my boiler?

You qualify for a special offer! If your boiler has an existing balanced flue a large square flue through to the outside it will rely on natural draft and is often called RS (or room sealed). Updating the flue system with a fan flue will make the boiler more efficient, but only requires a 100mm circular flue.

Is it possible to install a balanced flue in a chimney?

A competent plumbing or heating contractor will be able to advise you on the best flue for your heating system. In many cases it is possible to retain the aesthetics of a traditional chimney and get the safety and efficiency advantages of a balanced flue through installing a special flue liner in your existing chimney.

How does a balanced flue work in a boiler?

A balanced flue supplies air to the combustion source –stove or boiler– by means of a double skinned construction (think of a tube inside a tube). Combustion gases are drawn away from the boiler or stove through the flue, but the flue also allows air to be drawn into the boiler or stove from the outside.

How does a conventional flue work in a fireplace?

Conventional flues Conventional flues use natural circulation of heated air to take gases and combustibles away from the fire in a fireplace, boiler, or stove. Rather than being drawn from outside like a balanced flue, the air is drawn from around the appliance.

What’s the difference between conventional and balanced flues?

They are available in a variety of diameters and lengths – 80mm, 100mm, 125mm and 150mm diameters, and lengths which range from 250mm to 1250mm. Conventional flues rely on the natural circulation of heated air to take smoke and combustion gases away from the source of combustion, e.g. a fireplace, stove or gas or oil-fired boiler.