Burning sawdust in your Greenheart workshop stove
Your can burn small offcuts, wood sawdust from untreated woods, and some shavings in your Greenheart workshop stove.
If your workshop is in a windy or exposed position then we would advise fitting a flue damper to the flue. This gives you better control over the burning rate, letting you slow burn the stove easier and keep it in for longer. It is a real necessity if you want to burn shavings.
To start with load the stove up with fuel. You can fill the stove to near the top with sawdust, or small offcuts. You can mix in larger pieces of wood but we recommend that you do not as it is more efficient to burn either small fuel or larger pieces.
If you are burning shavings then you must mix in sawdust or the stove is liable to burn too hot. We also advise the use of a flue damper if you intend to burn shavings
When the stove has been filled simply light a piece of scrunched up newspaper and place it on top of the fuel. Put the stove top back on the stove. The newspaper will light the top layer of fuel and the stove will start. This works because the air intake tube for the stove goes to the bottom of the firebox allowing top down combustion of dense fuels. Normally the air for a stove is taken in so that it comes in over the top of the fuel - this makes sawdust smolder slowly. In an Greenheart workshop stove the sawdust is burning on top and the air is being sucked down through the sawdust giving much faster combustion - and heat.
Once the stove is going well regulate the burning rate by adjusting the air vents on top of the stove. If you had the ash door open to get it going close this fully. Your stove will burn at different rates according to the fuel you are burning, and how well your chimney draws. You will need to adjust the air supply to your stove whilst it is burning to make sure it does not go out and to make sure it does not overheat. It is possible to damage the stove by running it full blast all the time. Keep an eye on it and never let any part of it glow red hot.
You may find that very very fine sawdust does not burn well becuase it is so dense that the air cannot be sucked down through it. If this is the case mix in larger sawdust and shavings to the fuel to allow the air to be sucked down through the stove.
On dense hardwood sawdust from sawing the stove may stay in overnight. Sawdust from lighter woods should last from upwards of an hour. Very fine sawdust from sanding will need something lighter mixed in with it to properly burn.
Refilling your Greenheart workshop stove with sawdust
Care must be taken when refilling the stove with sawdust. Because sawdust can be very fine it can ignite in the air as you are filling the stove up. Please consider this before refilling the stove when it is already lit. One option is to add a thick layer of medium density sawdust (the sort that does not become airbourne) and then add any finer sawdust on top of that. You should relight the stove again by putting a piece of lit newspaper on top of the fuel.
Burning shavings on your workshop stove
Shavings can produce a very fierce heat and so the air intake of your stove must be tightly controlled. We also advise the use of a flue damper to further control the burn rate when burning shavings and if you are going to burn shavings then you also must mix them with some sawdust to reduce the air spaces in the firebox and thereby reduce the burn rate.