Boilers in closed system

Sigma Uni NZ

Sigma Uni NZ 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. Boiler is equipped with an intuitive, clear and simple controller allowing easy and quick adjustment of temperatures, change of options and adaptation to the individual needs. It is adapted for assembly in the closed system - it has installed equipment for heat removal in form of copper cooling coil pipe.

Reinforced version NZ with installed cooling coil pipe and compete protective fixtures allowing installation in closed system. NZ version requires extra payment, according to the Boilers Equipment Price List.

pik_5 klasa.jpg  class 5 - acc. to the standard 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 /grade P265GH/ of 6 mm thickness from steel mills of Arcelor Mittal Poland S.A.

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 fire suppression system with thermostatic valve
katalizator-ceramiczny.png ceramic catalyst stabilising combustion process
(*) - extra payable equipment, installed on Customer’s request

Specification / boiler type Unit 16 20 24 36
Power range kW 16 20 24 36
Heating area kW 4,8-16 6-20 7,2-24 10,8-36 14,4-48
Optimum thermal efficiency % ~88,8-88,9 
Heating area m2 2,1 2,3 2,4 3,8
Area of heated
m2 to 250
to 270

to 290

to 400
to 520
Capacity of fuel container** kg ~165 ~165  ~165 ~191
Max. permissible operation
bar 2,5
Required flue gas draught Pa
24 26 28 31
Water supply temperature
°C 65/80
Boiler weight ****
kg 462
Boiler water tank capacity l 97 100 114 160 196
Chimney section cm x cm 14x14 14x14 15x15 17x17
Chimney section Ø mm 160 160 178 195
Minimum chimney height m 6 7 7,5 9
Supply V/Hz ~230V/50 Hz
Maximum power consumption W 873/123 873/123 873/123 890/140 890/140
Diameter of supply and return Dn mm
G 1½”
Height to bottom edge
of flue
mm 159 178 178 178 194
width mm
1225 1225 1225 1375 1310
depth mm 1080 1170 1170 1259 1259
height mm 1430 1430 1430 1490 1700
Dimensions of substitute combustion
chamber and charging hole
mm 900 882 1030 1077 1290


*Maximum area of heated rooms estimated for unit heat demand q=80 W/m2.
****Height of boiler can be additionally adjusted by means of provided levelling legs. Legs regulation varies from 38 to 50 mm.

***** Boiler weight depends on the equipment.

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