Specifications

Wood chip boilers
Wood chip boilers are very similar to wood pellet boilers; in fact, many boilers can burn both fuels. Typically
wood chip boilers are found in larger scale installations, with wood pellet the preferred option for smaller
domestic installations.
Chip boilers are generally automatically igniting and continue to operate without manual intervention.
Again, self cleaning options are available. Similar to pellet boilers, a small amount of ash is generated that
needs to be removed periodically. The main advantage of chips over pellets is that the fuel and running costs
are cheaper.
Wood log / briquette boilers
Modern log boilers have very high eciencies. Wood log boilers dier from most wood pellet or wood chip
boilers due to the fact that wood logs are manually loaded however some systems have an integrated store
within the boiler so that only intermittent manual loading is required. Log boilers can be an advantage where
a supply of clean wood is freely available.
In most wood log systems, a large hot water storage tank or buer cylinder is required. The reason is because
wood log boilers burn the entire contents of the fuel chamber in a single burning period, the heat must be
“stored” so it can be available when required.
Wood logs and briquettes can also be used in open res. While this is preferable to fossil fuels from an
environmental perspective, open res tend to have very low eciencies and controlled combustion in a
boiler is a much more ecient method of producing heat.
Pellet store and feed mechanism
Wood pellet boiler installation Wood pellet boiler cutaway
Tractor powered wood chipper Chip store, chip agitator and boiler feed Wood chip boiler installation