A 15 

The boiler ROJEK A 15 is designed for heating buildings with low heat loss, adjustable power 3 – 14 kW.

Automatic hot water boiler A 15 enables to burn wooden pellets 6 – 8 mm diam. – both high quality white pellets and pellets of lower quality with bark mixture in automatic operation.

Retort burner enables to burn also lower quality bio fuels – plant pellets and in combination with an adapter also corn.

New generation of heating boilers for solid fuel and wood chippers of own design
A 15


Nominal output 14 kW
Min. output 3 kW
Boiler width 507 mm
Boiler height 1105 mm
Boiler depth 780 mm
Boiler depth, incl. chimney 780 mm
Chimney height 625 mm
Chimney diameter 129 mm
Height of water inlet 133 mm
Diameter of water inlet and outlet 2″
Boiler weight 310 kg
Boiler class in accordance with Norm EN 303-5 5
Efficiency 86,90%
Energy efficiency class of wood / coal A + / –
Energy Efficiency Index (EEI) of pellets / coal 112 / –
Seasonal energy efficiency of pellets / coal 77 % / –
Boiler emissions according to Commission Regulation (EU) No. 2015/1189 EKODESIGN
Hydraulic boiler loss 59 mbar
Water volume 106 l
Max. operation water overpressure 2 bar
Min. operation water overpressure 0,5 bar
Testing water overpressure 4 bar
Max. operation temperature 90 °C
Specified chimney draught 10 – 15 Pa
Consumption of wooden pellets with nominal power 2,9 kg/h
Consumption of wooden pellets for minimum capacity 0,9 kg/h
Temperature of burnt gas for nominal output 180 °C
Hopper volume 300l
Hopper volume 300 l
Approx. weight of pellets in hopper 180 kg
Boiler width, incl. hopper 1 130 mm

guarantee for the tightness of boiler body 3 years

In automatic operation the boiler complies with Class 5 – EKODESIGN in accordance with the norm EN 303-5.

Thanks to the fuel tank, electronic regulation and the burner with spiral feeder the boiler can work in automatic operation even for several days. The electronic regulation can be connected with a circular pump ( adjustment of temperature when the pump switches on ) and at the same time with room thermostat.

The controller basically contains a built-in module for controlling a four-way or three-way mixing valve. Furthermore, the ST 480 zPID controller can cooperate with an equithermal sensor, with other four-way or three-way valves, with a room thermostat, with a GSM module, with an Ethernet module (via the Internet)

The burner is installed in the lower part of boiler body. The retort burner is designed for lower fuel loading and the combustion process itself can be compared with a blacksmith hearth. From the tank the fuel is feeded by spiral feeder to the retort knee. Here it is forced out up to a round grate.

Both the grate and the retort are made of high quality cast iron. The retort is placed in a converter to which the air is blown by a blower. Through the slots between the retort and the grate the air is then driven to the burning fuel layer.

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