Log boiler systems are more suited to smaller systems, typically up to 60 kW.
Great with the right fuel supply
Logs are obtained directly from trees, with minimum processing involved. Generally, they are just covered to keep them dry and left for one to three years to ‘season’. In this time, the moisture content falls from around 50% to 20%, and they become lighter. The drier the logs, the hotter the fire and the less smoke and tar will be produced.
Log boilers have to be filled with wood manually; most pellet and chip burners use automatic fuel feeders which refill them at regular intervals. Logs require considerably more work, and you will need a significant fuelstock storage and handling area. Logs can be cheaper than pellets if you have a good local supply.