Fuel Stock

These boilers are extremely versatile.  They are best started on dry sawdust/chip, then once established they run far better on feed stock at roughly 30-40% moisture but will run from 15% to 65% with little, normally NO smoke and NO tar build up.  There is a large difference in power output between the extremes of moisture contents. These units are NOT designed to run on totally dry fuel and in this case will over burn resulting in black smoke from the chimney.

Standard feed size should be below 40mm, ie chipped/shredded fuels down to sawdust. A mix of sizes and moisture contents works very well. The occasional introduction of nonstandard sizes, log slithers, stones/rocks rarely affects it.  Anything that doesn’t burn will need riddling out from the grate. Augers normally used on biomass systems have a tendency to block up, we use scrapers and conveyors for even the worst fuel stock.

Also being able to use higher moisture content fuel results in a lower risk of a yard fire occuring and any respiratory health issues. If in the summer, the wood you are cutting is too dry, a dust suppressing water/mist spray can be used under the sawdust extractor’s cyclone exit. This prevents dust blowing over the yard and adds some moisture to the sawdust ready for use in the boiler. (I know backwards isn’t it, but very useful and safe!).

Acceptable Feed Stock

Do you produce a 15-65% moisture content sawdust or chip waste?

Waste fines from Biomass G30,40 & 50 production

Arb chip / Biomass Chip high or low quality

Sawdust from circular saw disc firewood processors, mills and fencing etc

Chainsaw dust/chip from handheld and firewood processors

Used sawdust horse bedding from equestrian yards.

And more high moisture wood waste applications…

Please note: DRY SAWDUST OR CHIP IS NOT SUITABLE!