5.3.4 Fuel table
The table below shows a selection of wood types with the corresponding energy con‐
tent depending on the water content:
Wood type
Energy content with water content [Btuh/lbs (kWh/kg)]
w = 15%
w = 20%
w = 25%
Softwood
6560 (4.3)
6190 (4.0)
5730 (3.7)
Hartwood
6350 (4.1)
5880 (3.8)
5420 (3.5)
5.3.5 Fill level in boiler
The table below shows the relationship between fill level and weight. It compares
spruce (example of soft wood) and beech (example of hardwood) with a water content
of approx. 20%. Using our example above with beech, the fill level of an S3 Turbo 40
would, therefore, be approx. one third.
Fill level
Weight at fill level
S3 Turbo 30
S3 Turbo 50
3/3
Soft wood
approx. 53 lbs (24 kg)
approx. 86 lbs (39 kg)
Hardwood
approx. 88 lbs (40 kg)
approx. 143 lbs (65 kg)
2/3
Soft wood
approx. 35 lbs (16kg)
approx. 57 lbs (26 kg)
Hardwood
approx. 60 lbs (27 kg)
approx. 95 lbs (43 kg)
1/3
Soft wood
approx. 18 lbs (8 kg)
approx. 29 lbs (13kg)
Hardwood
approx. 29 lbs (13 kg)
approx. 49 lbs (22 kg)
5.3.6 Reloading intervals when operating without thermal storage or if the thermal
storage is too small
NOTICE
Performance-related loading:
Only refuel if energy is required!
❒ If too much fuel is added, the boiler will drop below its minimum output limit and
enter into the “Slumber” operating status (blower fan is switched off)
➥ During “Slumber”, the efficiency drops, emissions increase and tar may form in
the boiler.
5
Heating the boiler
Before heating up the boiler
48
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