The log boiler works with half metre wooden logs, which are trimmed in a large fuel chamber. So normally, you only have to add fuel once a day - on very cold days no more than twice. The new wood burns with the embers from the last fire. If embers are no longer available, a bit of paper and a match is all it takes. The firing phase of the boiler starts automatically when the doors are closed.
Different types of wood have different burn properties. A lambda probe detects the condition of the combustion material, the air supply is automatically adapted to the wood quality. The ETA log boiler therefore also gets the highest possible efficiency from mixed wood or wood briquettes.
Only a bit of ash remains
Especially high temperatures are needed to convert the remaining combustible residue into heat energy. Even the toughest wood tar burns in the patented hotzone under the grate combustion at 900 to 1,100 °C. Thanks to the good burn-out, the ETA SH only needs de-ashing every one to two weeks.