Boilers with feeder for coal

Sigma Uni

Sigma Uni is an automatic boiler that is very convenient in use, is equipped with trough burner and is intended for combustion of eco pea coal. The highest quality of materials used for manufacturing of the burner ensure its long-term operation, while suitable design of the heat exchanger ensures optimum fuel combustion conditions, high efficiency and low pollutant emissions. Intuitive and user-friendly controller with colour touch display, with adjustable angle of inclination allows simple programming of the equipment and is responsible for control of system’s operation.
Boiler meets the power-emission requirements of class 5 of the PN EN 303-5:2012.

5 lat gwarancji na szczelność wymiennika ciepła, 2 lata na pozostałe elementy i sprawne działanie kotła 5 years of warranty for heat exchanger tightness, 2 years for the remaining components and efficient operation of boiler;
wymiennik ciepła wykonany z atestowanej stali kotłowej /gat. P265GH/ o grubości 6 mm z hut Arcelor Mittal Poland S.A. heat exchanger made of certified boiler steel
sterownik K1V2 z kolorowym panelem dotykowym obsługującym 4 pompy/ c.o.,c.w.u., obiegowa, podłogowa/. Obsługa zaworu mieszającego. Możliwość sterowania poprzez GSM lub INTERNET*****; regulowany kąt położenia panelu sterującego; controller K1V2 with colour touch panel servicing 4 pumps /central heating, hot utility water, circulation, floor pump/. Servicing of mixing valve. Possibility to control using GSM or INTERNET*****; adjustable angle of position of control panel
wysoka sprawność cieplna sięgająca 89% dzięki zwiększonemu odzyskowi ciepła ze spalin high thermal efficiency reaching 89% thanks to increased heat recovery from flue gases
uklad-zamkniety.png boiler adapted for installation in closed system*
układ samoczynnego zapłonu paliwa* fuel self-ignition system*
komora paleniskowa z wysoko efektownym palnikiem rynnowym furnace chamber with highly effective trough burner
system automatycznego wodnego gaszenia paliwa z zaworem termostatycznym automatic water extinguishing system with thermostatic valve
katalizator-ceramiczny.png ceramic catalyst stabilising combustion process
(*) - extra payable equipment, installed on Customer’s request


Name of the boiler   Sigma Uni
Specification/boiler type Unit 16 20 24 36 48
Power range kW 4,8-16 6-20 7,2-24 10,8-36 14,4-48
Heating area


2,1 2,3 2,4 3,8 4,7

Area of heated rooms 1


to 250 to 270 to 290 to 400 to 520

Fuel tank capacity 2

kg ~165 ~165 ~165 ~191 ~266
Optimum thermal efficiency % ~88,8-88,9
Energy efficiency class - B B C C B

Max. permissible operation


bar opened system: 1,5 / closed system: 2,5
Required flue gas draught Pa 24 26 28 31 34
Max. temp. of water on supply °C 65/80

Boiler weight 3

kg 462 501 529 669 735
Boiler water tank capacity l 97 100 114 160 196
Chimney section cmxcm 14x14 14x14 15x15 17x17 19x19
Chimney section

Ø mm

160 160 170 195 225

Minimum chimney height







Width mm 1280 1280 1280 1360 1360








Height 4

mm 1430 1430 1497 1557 1777

Diameter of supply and return Dn


G1 ½”

Diameter of flue mm 159 178 178 178 194




Maximum power consumption

(operation / firing)

W 123/873 123/873 123/873 140/890 140/890

Height to bottom edge of the flue








1 Maximum area of heated rooms estimated for unit heat demand q=80 W/m².
2 Fuel tank capacity for charging density 0,8 kg/dm³.
3 Boiler weight depends on the equipment.
4 Height of boiler can be additionally adjusted by means of provided levelling legs.
5 Extra paid option, installed on the customer’s request.
6 Details of burning pellets can be found in the manual of the boiler.

The boiler meet the requirements of the class 5 acc. to the PN-EN 303-5:2012 for power
of 16, 20, 24, 36 and 48 kW for a “pea” coal assortment.
On special request the boilers are available with exhaust fan and a mechanism for cleaning of heat
exchanger. Additional equipment components shall be added during ordering of the boiler.
Additional charge to basic version - according to the price list.
NOTE! Please specify side of the container (left or right) during ordering of the SIGMA UNI boiler.

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