HITZE SIGA - Types of Fuel; Refuelling; Preventing the Escape of Combustion Gases

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structure or damage to the protective (paint) layer of the stove.
4.1. Types of fuel
Considering the design of our appliances, the most suitable type of fuel is the deciduous hardwood,
including: oak, hornbeam, ash, beech, birch. In particular, we recommend using birch wood. The best fuel is wood
which has been seasoned (for at least two years in a well-ventilated and dry place), cut and chopped into logs.
We advise against using the wood of coniferous trees. Freshly cut or damp wood is not a good fuel because
it has low caloric value. The burning of insuciently dried wood may result in increased deposits of creosote
in the combustion gas ducts, which may cause overheating the stove and the glass panel to break.
NOTE:
It is forbidden to burn waste fuel, liquid fuels and other types of fuel not recom-
mended by the manufacturer of the stove.
It is strictly forbidden to use the following as fuel for the stove: bituminous coal, the wood of tropical
trees, all types of products containing chemical compounds such as petrol, alcohol, naphthalene, oil, waste and
laminated panels containing adhesives.
4.2. Refueling:
▪ fuel should be added when ames disappear over the layer of embers in the hearth; it is best to heap
embers into a pyramid-like shape onto the grate (from both sides, to ensure a sucient ow of air from
underneath the grate for ames to appear) and then add slivers of wood;
▪ embers should not be heaped over the grate in an even layer because it would signicantly reduce the ow
of air from under the grate and result in a build-up of gas in the hearth chamber and in the whole stove,
which might lead to an explosion;
▪ wooden logs in the combustion chamber should be arranged in parallel to the plane of the door;
▪ before loading the hearth with a new portion of wood, remove ash from the grate and empty the ash pan
if necessary.
4.3. Preventing the escape of combustion gases
To prevent the escape of combustion gases from the stove to the room during the opening of the
door, it is recommended to:
▪ set the primary air regulator in the fully open position for about 10 seconds before opening the door (lever
moved to its leftmost position);
▪ move the door slightly partly open, wait a few seconds (until combustion gases disperse) and then slowly
Fig. 8 Throttle operation - moved to the right - air supply closed, moved to the left - air supply open.