Can I install a woodburner if I don’t have a chimney?
Yes. We can install a twinwall chimney system in most houses, bungalows and even wood lodges, but you may need permission in listed buildings.
What’s the difference between an internal and external twinwall chimney system?
The location of a woodburner in a room will determine the route of a twinwall system. Our HETAS engineer will provide a FREE survey at your property in order to locate the best route for your twinwall chimney and answer all your questions.
Internal Twinwall Chimney Systems
In many properites it is possible to flue directly off the top of the stove and through the room above and exit out of the roof. Note: the twinwall must be boxed in when passing through a room above with an air gap stated by the flue manufacturer.
Can I connect a twinwall chimney to the back off a stove?
Yes, but for performance purposes we prefer to go off the top of the woodburner to aid the ventilation of the flue gases. You can only use a maximum of four 45 degree bends in a twinwall chimney system as bends can produce cold spots and reduce the performance of the chimney. Aesthetically, some client’s prefer to exit the rear of the stove to reduce the visual impact of the flue system.
Can weather conditions affect the performance of a twinwall system?
On cold days the metal twinwall chimney systems outside your property will have cold air pushing down inside the flue system and so can hinder the lighting process. It’s good practice on cold days to light the stove with the door open for some time by burning kindling to get the twinwall flue system up to temperature before adding logs and closing the appliance.
What colours are twinwall available in?
Twinwall systems are available in standard stainless steel or slightly more expensive powdered black. The powdered black twinwall seems to greatly reduce the visual impact of an external chimney system.
Is it expensive to install a twinwall chimney system?
The components are made from high quality stainless steel and designed to last 10-20 years. Installations should alwasy be done by a certified HETAS installers such as ourselves as each bespoke system needs to be carefully designed for optimum performance and adhere to Hetas specifications.
Typically systems cost about £2000 plus the cost or the stove, hearth etc. We provided free quotes and surveys so call us on 07715 104420
Can I install a twinwall chimney through a flat roof?
Yes. There are roof flashing available for most roof types. Lead flashing for tiled and slate roofs and flexible plastic flashings for fibre glass, zinc and flat roofs.
What diameter twinwall system will I require?
Generally, if woodburner has a 6″ spigot the you will need to use a 6″ twinwall system as the twinwall cannot be smaller than the spigot or reduce in size along the system. You can use a 5″ twinwall system if the woodburner spigot is 5″, but the stove must also be Defra approved. There are larger twinwall systems available for some industrial projects or woodburners which can be used with the door open.