Boilers with feeder for coal

Defro Duo Mini

Boilers with feeding screw and retort burner of II generation adapted for combustion of eco-pea coal and fine coal. Design of burner nozzle and even better fuel feeding system allows using fuels characterizing with better sinterability. Furnace is made of high quality heat resistant cast iron ensuring great durability. Boilers are equipped with the furnace chamber created by fixed water-cooled grate, what allows combustion of such fuels as thicker wood or coal and allows using boiler also on emergency cases. Microprocessor controller is used for supervision of combustion process and maintaining of temperature set for boiler.

5 lata 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 6mm 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.
wysoka sprawność cieplna powyżej 88% high thermal efficiency over 88%
uklad-zamkniety.png boiler adapted for installation in closed circuit in version DUO MINI NZ
auto-manual.png two furnace chambers: bottom with automatic burner, upper for wood combustion /for manual charging/
ślimak w całości wykonany z żeliwa worm completely made of cast iron
duza-komora-retort-pz.png large combustion chamber with highly effective retort burner made of high quality cast iron

(*) - extra payable equipment, installed on Customer’s request

DEFRO company reserves the right to introduce without any notice changes in technical parameters, equipment and specification of offered products. Information included on this page are not assurance within the meaning of art. 4 par 3 and 4 of the Act of 27 July 2002 on special conditions of consumer sales and change of Civil Code (hereinafter “Act”) and are not description of the product within the meaning of art. 4 par. 2 of the Act. This page is not an offer within the meaning of the art. 66 of the Civil Code.

Specification / boiler type Unit 14 17 22 30
Power range kW 4,2-14 6,0-20 7,5-25 10,5-35
Heating area m2 1,7 1,9 2,4 3,2
Area of heated
rooms*
m2 to 190 to 230 to 280 to 360
Capacity of fuel container **
kg
~148
~148
~148 ~198
Optimum thermal efficiency %
~87
Max. permissible operation
pressure
bar
1,5
Required flue gas draught Pa
23
25 27
30
Water supply temperature
max.
°C
65/80
Boiler weight ****
kg
377
395
438
513
Boiler water tank capacity l
66
72
87
114
Chimney section cmxcm
14x14
14x14
15x15
17x17
Chimney section Ø mm 160
160
165
190
Minimum chimney height m
5
6
7
8
Width mm
1197
1230
1230
1230
Depth mm
812
812
837
910
Height ***
mm
1475
1475
1492 1598
Diameter of supply and return Dn mm
G 1½”
Flue size mm 159
159
159
159
Supply V/Hz
~230/50   
Maximum power consumption W
267
267
267 284
Height to bottom edge
of flue
mm 1437 1437
1492
1598
Dimensions of substitute combustion
chamber and charging hole
width 308
358
358
358
  width
340
340
390
470
  height 220
220
220
230
  width x height.
308 x 188
358 x 238
358 x 238
358 x 238

 

* Maximum area of heated rooms estimated for unit heat demand q=80 W/m2.
** Fuel tank capacity for charging density 0.8 kg/dm3
*** 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.


DEFRO company reserves the right to introduce without any notice changes in technical parameters, equipment and specification of offered products. Information included on this page are not assurance within the meaning of art. 4 par 3 and 4 of the Act of 27 July 2002 on special conditions of consumer sales and change of Civil Code (hereinafter “Act”) and are not description of the product within the meaning of art. 4 par. 2 of the Act. This page is not an offer within the meaning of the art. 66 of the Civil Code.

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