What Size Flue Liner Do I Need for My Stove?

The required liner diameter depends on your stove's efficiency rating and the size of its flue outlet:

• Modern EcoDesign & DEFRA Exempt Stoves: These clean-burning models allow for a minimum 5-inch (125mm) liner, or a liner equal in width to the flue collar.

• Standard & Older Stoves (Non-EcoDesign): The recommended minimum size is a 6-inch (150mm) Class 1 liner, even if the stove’s outlet is 4 or 5 inches.

• Large Outlets: If your stove has a flue outlet larger than 6 inches, the liner must match that increased width.

Note: The flue requires chimney sweeping prior to lining.

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Flue Lining for Open Fires

Wood Stove Fitters & Chimney Sweeps only provide flue lining for chimneys used with wood stoves. We do not provide open fire flue lining. However, if you need your open fire chimney swept, please get in touch.

If you want to update your open fire, you are going to need a flue liner:

• The 10-inch Standard: Most modern regulations suggest a minimum width of 10 inches.

• The 8-inch Reality: We see a lot of existing open fires with 8-inch liners that work fine.

• Fitment: Many chimneys won't fit these sizes, so you might want to consider the “Thermocrete method” or opt for a log burner.

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Types of Solid Fuel Stainless Steel Flue Liner

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316 / 316  for use with Seasoned Wood. Used on the majority of UK installations; designed mainly for wood fuel.

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316 / 904 A hybrid of the two grades of metal; installers generally prefer pure 316 or pure 904.

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904 / 904 Multi-Fuel For coal, smokeless fuels, and wood. 

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Important: Stainless steel liners are not ideal for heavy coal use (Aga/Rayburn rangesboilder stoves  etc ) and can rot out easily. 904 liners are for light domestic, occasional use only.

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Important Information

We come across countless jobs where a client has tried to reduce costs by having their builder drop the flue liner down the chimney. This seemingly simple task is hardly ever done correctly!

Any experienced HETAS, OFTEC, or other competent registered installer will refuse to finish the job or issue a certificate of compliance on a liner they didn't install. This leaves the client with an expensive mistake or an installation that simply cannot be signed off.

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Get it done properly!

It costs more for a registered fitter to drop the liner than a general builder, but the advantage of using Wood Stove Fitters & Chimney Sweeps is that it is done professionally and safely. Why put your family at risk for the sake of saving some money?

Once the scaffolding is down, the chimney work is inaccessible—meaning a registered installer cannot inspect or sign off the job later.

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Wood Stove Fitters & Chimney Sweeps Little Cottages, Eastcombe, Stroud, GL6 7DN