Today, it is not a necessity to install a gas fire or stove into a traditional chimney setting with a conventional flue; many gas fired appliances offer you the option of a balanced flue system which will exit discreetly from your property via a twin-wall pipe.
Conventional flue systems are easily recognisable as either a conventional brick or stone chimney, pre-fabricated or pre-cast chimney system. Should your home have none of these at present, it is usually possible to have a pre-fabricated system installed in your home if required.
Brick/Stone Chimney (Class 1)
The chimney stack rises well above the roofline and is topped by a traditional chimney pot or gas terminal. This type of chimney relies on the natural circulation of heating air to expel the products of combustion up your chimney.
Pre-fabricated Flues (Class 1 & 2)
You will see a metal flue cowl on your roof. Some are all metal whilst others may terminate through a short rectangular pot (but without a chimney stack). These flues create the same circulation of heated air as a brick or stone chimney.
Pre-cast Flue (Class 2)
Many modern homes have been built with such flues. You can readily identify them by either a metal flue cowl or a raised ridge terminal on your roof. The natural circulation of heated air expels the products of combustion.
These flues tends to be very shallow in depth so a slimmer fire is often required. Deep appliances however may be able to be installed with the use of either a spacer kit or deeper rebate into the fireplace.
Balanced Flue (No chimney required)
Balanced flues work in conjunction with Gazco’s Glass Fronted gas stoves or fires. The appliance is completely sealed from the room into which it is installed (so there are no draughts and heating efficiency is increased) and a twin-wall pipe vents directly to an outside wall.
Air for combustion is drawn in through the outer pipe whilst the inner pipe removes the combustion gases to the exterior of the property.
Depending on the stove or fire selected, the twin-walled pipe may exit horizontally through an external wall or vertically through the roof.
Powered Flue (No chimney required)
A powered flue uses an extractor unit mounted to vent the combustion gases directly outside. This means that your gas stove or fire does not have to be installed against an external wall, so it can be located in more rooms around your home. A mains electricity supply is needed to operate this system.
Electric Stoves & Fires (No chimney required)
All electric stoves and fires run on a standard 13amp plug
Courtesy of www.gazco.co.uk