Environmental Engineering Reference
If the annual heat requirement is not known, an estimate can be made on the basis
of 200 kWh per square metre of living area for an average building, 100 kWh/m 2
for a standard new-build and 30 kWh/m 2 for a three-litre house based on Central
European climatic conditions. The heat needed to provide hot water is added to this
On this basis, the heat required for a standard new-build with 130 m 2 of living area
is 13 000 kWh. If 2000 kWh is added for hot water, the total heating requirement is
15 000 kWh. With an average boiler effi ciency of 80% = 0.8 the store volume is
then calculated as
0 8 650
A store with a fl oor area of 2 m
2 m and a height of 2.17 m would be suffi cient.
This store can hold pellets with a pellet volume of 2/3 · 8.7 m 3 = 5.8 m 3 . The mass
of the pellets amounts to 5.8 m 3 · 650 kg/m 3 = 3770 kg. If more space than this is
available, the store can be made larger. The cost of delivery quantities of 5 tons or
more is generally lower than for smaller quantities. A store volume of around
11.5 m 3 is necessary to store this quantity. It is important that optimal storage condi-
tions exist so that the pellets do not suffer long-term damage due to high air
Pellet Fuel Institute
Steps to Installing Biomass Heating
■ Determine type of fuel.
Cut wood/fi rewood - using one's own wood.
Wood pellets - for a fully automated mode of operation.
■ Estimate heat requirement and heat output.
If necessary, base needs on previous heating system.
■ Can the heat requirement be reduced through insulation?
■ Dimension of store - is an adequate store available?
Is suffi cient space available for buffer storage?
Is the chimney suitable for connecting biomass heating?
■ Clarify regulations concerning system operation and residue removal,
for example, by a chimney sweep.
Request quotations for biomass heating