The recommended sweeping/servicing frequency for closed appliances burning wood is up to four times annually and if burning smokeless fuels twice annually as a minimum. Strange as it may seem you can actually have more build up in the chimney from fewer fires. The reason for this is that each time the fire is lit the flue is cold, which will cause the gasses to cool more quickly in the flue and increase the deposits on the liner. When a chimney has warmed over a few days use and is used regularly the chimney never fully cools down so the gasses exit quicker reducing build up in the liner. I have seen cases where a stove has only been used 10 times over the winter but has more build up in it than a stove that’s had 100 fires. Also it is not advisable to leave deposits in stainless steel liners as soot is very acidic and starts to disintegrate the steel quite quickly. This can greatly reduce the useful life of the liner resulting in expensive repairs.
I would never advise leaving a stove for a year even if it has had little use, it is surprising how quickly things can build up!
Here is a short video that is worth a watch to demonstrate what can
I hope that’s helpful!
Iain explains why it is important to have your Aga, Rayburn (or similar) Flue regularly swept. Although there may be very little soot, sometimes none at all, a lot of fluff/dust/pet hair etc. gets drawn into the flue and collects around the edges of the flue and liner. If left unchecked this can significantly reduce the draw and therefore the performance of the appliance. Also it is worth noting that your Gas or Oil service engineer will usually only check for draw with a smoke match and not inspect or sweep the flue. The flue may pass the test but failure could still be imminent. This means that investigation of the flue will only happen once the problem is so bad that the chimney/flue has stopped working effectively.
The Master Sweep
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