Solid fuel boilers are burning wood, pellets, or coal, so they produce significantly higher flue temperatures, more soot, and a greater risk of chimney fires than gas appliances. That's why the chimney must be rated for extreme heat and built to contain a soot fire safely.
Where gas boiler chimneys prioritise corrosion resistance and precise sizing for low-temperature exhaust, solid fuel installations demand higher temperature ratings (450°C - 600°C), thicker insulation to maintain strong draft, and certified soot-fire resistance to protect the building if unburned deposits ignite inside the flue.
Sauresta's double-wall 25 mm, 50 mm, and triple-wall chimney ranges are all certified to EN 1856-1 and rated for soot-fire resistance. They cover the full spectrum of solid fuel applications. Choosing the right insulation thickness and clearance rating is especially important with solid fuel: more heat means more demand on every component, and a correctly specified chimney is the first line of defence against fire.
