Retort burner enables to burn also lower quality bio fuels – plant pellets and in combination with an adapter also corn. With an additional folding grate of cast iron segments in the boiler ROJEK TKA 15 you can burn piece wood, biomass and other solid fuels in manual operation.

With wooden pellets /Class 5/ and brown coal – grain size 4 – 25 mm in automatic operation the boiler complies with Class 4 in accordance with the norm ČSN 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 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.

The automatic hot water boiler ROJEK TKA 15 can work both in automatic and also in manual operation. It is provided by a cooling loop (a protection against overheating), a folding grate made of segments and a tilting front grate, both of quality cast inon, and a thermostatic draught control with a chain in order to adjust the inlet of primary air – power control in manual operation.