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21.9.2021 9:02:02
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Mgr.Vojtěch Kerhart

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TKA 25 - Automatic hot water boiler for solid fuels

burning boilers,

Adjustable power 7, 5 – 25 kW

Automatic hot water boiler ROJEK TKA 25 enables to burn brown coal grain size 4-25 mm or wooden pellets 6 – 10 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. With an additional folding grate of cast iron segments in the boiler ROJEK TKA 25 you can burn piece wood, biomass and other solid fuels in manual operation.

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 25 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.

ROJEK TKA 25 complies with Class 4 in accordance with the Norm ČSN EN 303-5 for both the pellets and brown coal (fraction 4 - 25 mm) in automacic operation.

TKA 25 - Enlarge

TKA 25 - Technical data

Nominal output 25 kW
Min. output7,5 kW
Boiler width614 mm
Boiler height1530 mm
Boiler depth686 mm
Boiler depth incl. chimney910 mm
Chimney height1424 mm
Chimney diameter159 mm
Height of water inlet632 mm
Diameter of water inlet and outlet 2"
Boiler weight465 kg
Boiler class in accordance with Norm EN 303-54
Efficiency86 %
Pellet / coal energy efficiency classA + / C
Energy efficiency index (EEI) of pellets / coal113 / 79
Seasonal energy efficiency of pellets / coal78 % / 79 %
Boiler emissions according to Commission Regulation (EU) No. 2015/1189 EKODESIGN
Hydraulic boiler loss 59 mbar
Size of loading hatch, semicircle - width x height250/ 237 mm
Water volume108 l
Max. operation water overpressure2 bar
Min. operation water overpressure0,5 bar
Testing water overpressure4 bar
Max. operation temperature90 °C
Specified chimney draught8 - 12 Pa
Consumption of wooden pellets with nominal power6 kg/h
Consumption of wooden pellets for minimum capacity1,7 kg/h
Consumption of brown coal for nominal capacity5,4 kg/h
Consumption of brown coal for minimum capacity1,4 kg/h
Temperature of burnt gas for nominal output180 °C
Hopper 300 l
Hopper volume300 l
Approx. weight of pellets in hopper180 kg
Boiler width incl. hopper1370 mm
Hopper 500 l
Hopper volume500 l
Approx. weight of pellets in hopper300 kg
Boiler width incl. hopper1 435 mm

TKA 25 - Details

Wooden pellets with bark mixture
Plant pellets
High quality wooden pellets
Brown coal, grain size 4 - 25 mm

TKA 25 - Videos

19 078,6 kB

TKA 25 - Documents to download

DocumentSizeType of documentLanguage
Kotle_UK.pdf2 523,2 kBHot water boilers for wo (show-card)English
Kotle_RO.pdf3 343,6 kBHot water boilers for wo (show-card)Romania
Kotle_HU.pdf1 653,8 kBHot water boilers for wo (show-card)Magyar
Kotle_FR.pdf3 136,9 kBHot water boilers for wo (show-card)Français
TTP/OZ_TKA25.pdf3 461,4 kBTest certificate TKA 25 (certificate)ČeskyEnglish

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