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Ideal for tight spaces

The KU type boiler from ZGM ZĘBIEC SA is a heating unit with the upper combustion of solid fuels. The compact size of the boiler, combined with its lower heat output, makes it ideal for small buildings, such as summer cottages, garages, workshops, utility buildings, and individual apartments in multi-family buildings.

Convenience of use

The operation of the boiler can be controlled automatically or manually. By choosing an accessory control device, such as a draught regulator for combustion temperature control, time and effort can be reduced to an absolute minimum. However, the boilers can be operated manually by means of a special throttle.

Tough design

In the manufacture of this boiler only top grade materials are used to guarantee its strength and resistance to pressure and high temperatures. The water jacket is made of certified sheet steel of 3–4 mm in thickness, while the insulation used reduces heat loss. The KU-6 boiler features a universal design of the heat exchanger, so despite its small size, the boiler quickly reaches the expected combustion efficiency. Its solid structure and proven solutions ensure excellent thermal efficiency and a long service life.

Reliable choice

The fixed water grate is quick to deliver heat to the surrounding water, which enhances the thermal efficiency of the unit. KU steel boilers are very durable, and they enjoy a great deal of popularity due to their compact size.



High combustion efficiency and thermal efficiency up to 82%.


Certified boiler plates P265GH.


Combustion is controlled by means of an automatic draught regulator* or manually (*as an option at extra charge).


Easy and quick operation.

48-month warranty for the leak tightness of the water jacket.

24-month warranty for service life and efficient operation.

drewno paliwo
Hard coal Wood


Automatically by means of a draught regulator
Manually by means of a screw adjusting the position of the flap in the lowest door


Automatically by means of an electronic controller (ZS-01)

Instrukcja obsługi – Seria KU KU-6 – etykieta energetyczna


BOILER Height Width Depth A B C Flue Burning chamber Charging hole E
D height width depth width height
KU 6 743 318 650 243 501 659 Ø 127 147 218 380 146 199 332
L.p. Detailed data UOM Boiler KU 6
1 Rated thermal output kW 6
2 Operating range kW 2÷6
3 Charge capacity of the burning chamber dm3 14
4 Boiler water capacity dm3 16
5 Required draught Pa ³20
6 Min. chimney height m 5
7 Max. operating pressure bar 1,5
8 Min. chimney cross-section area cm x cm

Æ cm


Æ 14

9 Flue diameter mm Æ127
10 Max. water temperature °C 95
11 Heat efficiency at rated power % do 82
12* Single-charge sustained combustion at rated power h do 5
13* Single-charge sustained combustion at min. power h do 13
14 Connection pipes, leaving/return water (threaded G 1″) mm Æ33,7×4 (1”)
15 Weight of empty boiler kg 100
16 Overall dimensions height mm 743
weight mm 318
depth (incl. flue and doors) mm 650

* for reference only; depends on bulk density, calorific value, fuel grade, etc.

ZĘBIEC boilers Thermal output Heated floor area [m2], based on the heat transfer coefficient of the walls (insulation)
U 1 [W/m2K] U ~ 0,7 [W/m2K] U ~ 0,5 [W/m2K] U ~ 0,3 [W/m2K]
no insulation ~5cm styrofoam ~8cm styrofoam ~10cm styrofoam
KU 6 6 52 60 70 92

Draught regulator

A draught regulator in solid-fuel boilers is a thermostatically operated device for controlling water temperature in the boiler.
The thermostat head of the regulator monitors the water temperature in the boiler and via levers and a chain moves a flap to increase or reduce the airflow into the hearth.