How often should a chimney or wood-stove flue be cleaned?

The short answer

If you burn wood, have the chimney swept at least once a year, just before the heating season — and expect to do it more often if you burn a lot. The sources we could read disagree on exactly how much more: HETAS (the UK's solid-fuel appliance body) recommends sweeping at least twice a year for wood, while Scotland's fire service leaflet suggests quarterly when in use. For smokeless fuels such as anthracite, both say at least once a year. The Greek Fire Service tells households to clean the chimney "regularly" but, in the leaflet we read, gives no number.

What Greek sources say

The Hellenic Fire Service's prevention leaflet says that if you have a fireplace you should clean the chimney regularly, because the layer of soot left on the walls catches fire easily. It also says to make sure the fire is out before you leave and to put a spark guard in front of the hearth.

We did not find a Greek law or regulation that sets a cleaning interval for a home chimney, so we are not claiming one exists. Treat the figures below as manufacturer and fire-safety guidance, not a legal deadline. Insurers' policy wording may set its own conditions — check yours.

What other fire-safety bodies and manufacturers say

• HETAS (UK): at least twice a year when burning wood, at least once a year for smokeless fuels. The best times are just before the heating season and after the stove has sat unused for a long period. If you sweep twice, the second sweep should come after the peak of the heating season.
• Scottish Fire and Rescue Service: by fuel — smokeless coals or oil at least once a year; wood quarterly when in use; bituminous coal or peat twice a year. It also advises a clean sweep before winter, because debris and blockages can build up while the chimney sits unused over summer.
• Morsø (stove manufacturer, North American manual for the 6100): inspect the chimney and connector at least once every two months during the heating season for creosote build-up, remove any you find, and do a thorough clean and inspection before the season. Note this is one manual for one model sold in North America; your own stove's manual takes priority.

Why the numbers differ

How fast a flue fouls depends on what you burn and how: damp wood and slow, low-air fires leave more tar and creosote. The Morsø manual explains that creosote forms when wood burns slowly and its vapours condense in the cooler flue. So a stove used daily as main heating needs more attention than a fireplace lit a few evenings a year, and the sources' "per year" figures are a floor, not a target.

A practical routine

1. Before the first fire of the season, inspect the flue and have it swept — this also catches nests and blockages from the off-season.
2. During the season, look inside the flue regularly if you burn often; sweep again if you see a build-up, or on the schedule your stove's manual gives.
3. After heavy use or a long burning season, consider a second sweep before the stove goes idle.
4. Use a qualified chimney sweep if you cannot inspect and clean the whole flue yourself, and keep the receipt.
5. Keep a dry-powder extinguisher near the stove; see our guide on fire extinguisher servicing for the schedule that applies to it.

Before you rely on this

This guide reflects the sources listed above as read on the date shown. The Greek Fire Service leaflet gives no interval, the UK sources are guidance for UK appliances and fuels, and the stove manual is for a single model. If your stove or insurer specifies an interval, follow that.

Track it in Epimeleia

Add your fireplace or stove as an item and set a yearly "chimney sweep" reminder for early autumn, before the first fire. If you burn daily, add a second reminder after the main heating season. Attach each sweep's receipt so you can show an insurer when the chimney was last cleaned.