If you’re relatively new to wood-burning stoves, it can be a bit disconcerting if yours suddenly starts making a funny noise. Perhaps your stove has starting ticking or knocking noise, or maybe a noise that sounds a bit metallic clanging out every now and again.
The good news is this this sort of noise, which can sometimes be quite loud, is not normally an indication of a major problem. Here are some possible causes:
The very process of using a woodburner means you’re relying on a lump of hot metal to heat your room. When metal gets hot it can expand, and when it expands it can sometimes make a noise. This is the most common reason for a ticking or knocking noise coming from a stove. For peace of mind, invest in a stove pipe thermometer to make sure you’re not asking your stove or flue to expand too much.
Remember the reverse of the above is also true. If the noise is audible when the stove is out of use or the fire is dying out, it might be because the metal is contracting back having expanded when the appliance was in use.
Windy or exposed property
If you think of how a musical instrument like the flute operates, it is little wonder that a flue pipe can make a noise if it particularly exposed or if its windy outside. Should this become a regular or annoying problem, you might consider a chimney cowl to limit the wind’s interference with your stove system.
If none of those possible explanations sound right, it could be due to a loose part within your stove system. Loose flue joint straps or cowl/cap straps are prime candidates in this case.
Burning the wrong sort of fuel in your woodburner can cause mini-explosions within the firebox. These can sometimes be substantial enough to crack the glass or cause damage to internal stove parts. Household fuels like pet coke and household coal should be avoided for this reason.