5 Boiler construction
The Holz Master boiler design is based on a steel heat exchanger, that ensures simple operation,
high efficiency and long life. The advantages of steel heat exchanger are combined with a modern
ceramic burner. This solution has enabled the construction of solid fuel-fired device that combines
the advantages of the boiler with manual loading with the ecological advantages of biomass-fired
boilers.
The Holz Master boiler, its size and layout of heating system connections and chimney are shown in
Fig. 1. The boiler diagram with distinguished the most important assembles is shown in: Fig. 2, Fig.
3 and Fig. 4. They include views showing the boiler from all sides.
Two chambers can be distinguished in the boiler construction - the upper and lower one. The upper
chamber functions as a combustion chamber, to which timber is loaded, which is then ignited and
will be gasified. The door situated at the chamber top serves for fuel loading, cleaning and
maintenance of the upper chamber. In addition, the chamber has a bottom cleaning hatch, closed
with two butterfly handles. It is used for removing ash accumulated on the bottom of the upper
chamber.
The upper and lower chambers are separated with the ceramic burner, used for combustion of gases
generated during pyrolysis of wood burning in the upper chamber. Gases flowing through the
burner are burnt in the lower chamber. Inspection door serves for the lower chamber's handling,
maintenance and cleaning of the chamber itself and surfaces of the ceramic burner.
At rear of the boiler there is situated the tube heat exchanger constructed of vertical fire tubes. It
connects the lower chamber of the boiler with the flue gas collector, located in the rear part of the
boiler. Exchanger is equipped with a manual cleaning system, enabling to maintain the surface
clean.
Air for combustion in the ceramic burner and in the upper chamber is sucked by the exhaust fan
located in the flue gas collector. The amount of air sucked into the burner and the upper chamber
can be individually adjusted with dampers located at the rear of the boiler. The flue gases from the
Holz Master Manual
wer. 22/05/2012/EN/V1.0
HKS LAZAR
str.8