Boilers with feeder for coal

Sigma Uni

Sigma Uni Discontinued equipment

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.

gwarancja_5_lat 5 years warranty for heat exchanger tightness, 2 years for the remaining components and efficient operation of boiler;
stal_6mm Heat exchanger made of certified high-grade boiler steel;
sprawnosc_88 High thermal efficiency reaching 90% due to increased heat recovery from flue gases;
sterownik_K1Pv4 Controller K1P v4 with colour touch panel servicing four pumps /central heating, domestic hot water, circulation, floor pump/. Servicing of mixing valve. Possibility to control using GSM or INTERNET - extra paid option; adjustable angle of position of control panel;
NZ NZ version - adapted for installation in closed system, reinforced design, cooling coil pipe installed - extra paid option;
palnik_retortowy Combustion chamber with highly effective trough burner;
system_gaszenia Automatic water extinguishing system for fuel suppression with thermostatic valve “FIRE FIGHTER”;
czujnik_pokrywy Sensor indicating opening container’s cover;
slimak Coil of endless screw in the fuel feeder made of one piece;
drzwiczki Change of direction of boiler door’s opening (not applicable to internal glow doors);
adaptive_control ADAPTIVE CONTROL control - adjustment of boiler operation based on air flow through the heat exchanger;
abm Energy-saving motoreducer with high efficiency with automatic reverse in case of locking of fuel feeder;
ceramika Ceramic catalysts stabilising combustion process;
automatyczny_zaplon Version R - Fuel self-ignition system (extra payable option);
system_automatycznego_czyszczenia  Version F - System for mechanical cleaning of heat exchanger - extra payable option;
bar  Pressure equalisation system in fuel container;


Version F - System for mechanical cleaning of heat exchanger - extra payable option;


Specification / boiler type

unit 16 20 24 36 48


- eco-pea coal 5-25 mm

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

Capacity of fuel container 2

kg ~165 ~165 ~165 ~191 ~266

Optimum thermal efficiency

% ~88,8-88,9

Energy efficiency class

- B B C C B

Max. permissible work pressure

bar 1,5 - opened system, 2,5 - closed system

Required flue gas draught

Pa 24 26 28 31 34
Water temperature on supply max. °C 65/85

Boiler weight 3

kg 462 513 529 669 735

Boiler water tank capacity

l 97 100 114 160 196

Chimney section

cmxcm 14x14 16x16 16x16 18x18 22x22

Chimney section

Ø mm

160 180 180 200 250

Minimum chimney height







Supply and return socket diameter


G1 ½”

Diameter of the exhaust gas socket

mm 159 178 178 178 194




1 Maximum area of heated rooms estimated for unit heat demand q=80 W/m2.

2 Fuel tank capacity for bulk density of eco-pea coal equal to 0,8 kg/dm3.

3 Boiler weight depends on its additional equipment.


Height of boiler can be additionally adjusted by means of provided levelling legs.

The regulation of legs varies from 38 to 50 mm.

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