IMPORTANT: It is essential to upgrade an existing flue system when replacing an old boiler; flue temperatures on a modern boiler are considerably lower and will not heat the chimney, as a result, condensation will form and may penetrate brickwork or drain back into the boiler causing internal corrosion (on a non-condensing boiler). Existing flexible corrugated liners must also be replaced; they will not be twin-walled as detailed in the diagram below, condensation will penetrate the liner.

Download Conventional Flue Check List
  • FIRST select flue kit - ADD TO QUOTE
  • Then select the extra parts needed - ADD TO QUOTE
  • For more than 1 of a part, change the quantity in the CHECKOUT page
conventional open flue chimney system for oil boilers by Hounsfield Boilers