Boilers in closed system

Defro Duo NZ

DEFRO DUO is a flagship boiler with characteristic logo of our company. This innovative design has two combustion chambers - bottom, equipped with automatic fuel feeder with integrated retort burner and upper created by the fixed-mounted tubular water-cooled grate with wall thickness of 8.8 mm. Use of the upper chamber allows using e.g. wood chips as a fuel, it also allows start-up of the boiler in the emergency situations. Grate deck acts also as a water tubes and acts as an additional heat exchange surface. Heat exchanger of boilers is completely made of boiler steel of thickness 6-10 mm, while the individual components endangered with action of flames and substances in the flue gases - are made of thickness even 10-12 mm. Boilers are equipped with series of sensors monitoring its operation. They are adapted for installation of the additional, automatic, water extinguishing system STRAŻAK (FIRE FIGHTER). Version of the boiler with innovative PID controller with touch panel is available as a standard.

 

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.

   
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 6-10mm z hut Arcelor Mittal Poland S.A. heat exchanger made of certified boiler steel /grade P265GH/ of 6-10 mm thickness from steel mills of Arcelor Mittal Poland S.A.
sterownik K1P z kolorowym panelem dotykowym obsługującym 4 pompy /c.o., c.w.u., obiegowa, podłogowa/ oraz algorytmem PID. Możliwość obsługi zaworu mieszającego, sterowanie poprzez GSM lub Internet*, regulowany kąt położenia panelu sterującego, sterowanie PID controller K1P with colour touch panel servicing 4 pumps /central heating, hot utility water, circulation, floor pump/ and PID algorithm. Possibility to operate mixing valves, control using GSM or INTERNET*; adjustable angle of position of control panel, PID control
wysoka sprawność cieplna powyżej 90% high thermal efficiency over 90%
uklad-zamkniety.png boiler adapted for installation in closed system in version DEFRO DUO NZ
 duża komora spalania z wysokoefektywnym palnikiem retortowym
large combustion chamber with highly effective retort burner
dwie komory paleniskowe: dolna z palnikiem automatycznym, górna do spalania drewna /przy załadunku ręcznym/ two furnace chamber: bottom with automatic burner, upper for wood combustion /for manual charging/
(*) - 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 15 20 25 35 50 75
Power range kW 4,5-15 6,0-20 7,5-25 10,5-35 15,0-50 22,5-75
Heating area m2 1,9 2,4 2,8 3,2 4,4 5,8
Area of heated
rooms*
m2 to 200
to 260 to 300 to 370 to 580 to 750
Capacity of fuel container*** kg ~176 ~176 ~176 ~266 ~266 ~342
Optimum thermal efficiency % ~90,3-90,9
Max. permissible operation
pressure
bar 2,5
Required flue gas draught Pa
24
26
28
31
34
38
Water supply temperature
max.
°C
65/80
Boiler weight ****
kg
465
504
539
627
798
949
Boiler water tank capacity l
80
106
114
120
172
218
Chimney section
cmxcm 14x14
14x14
15x15
18x18
20x20
25x25
Chimney section Ø mm
160
160
170
200
230
280
Minimum chimney height m
7 7,5
8
9
10
11
Width mm
1080 1080 1136 1300
1300
1380
Depth mm
950
1060
1060
1090
1310
1318
Height ** mm
1664
1664
1664
1715
1715
1912
Diameter of supply and return Dn mm
G 1½”
G2”
Flue size  mm 159
159
178
194
194
245
Supply V/Hz
~230/50     
Maximum power consumption W
 123 123
123
140
140
195
Height to bottom edge
of flue
mm
1258
1258
1252
1270
1270
1404
Dimensions of substitute combustion
chamber and charging hole
width
308
308
358
408
404
504
  depth
420
529
529
529
750 750
  height 203
191
228
253
223
331
  width x height 308x398
308 x 188
358x 398 408x 398 408x 398 504x 398

* Maximum area of heated rooms estimated for unit heat demand q=85 W/m2.
** Height of boiler can be additionally adjusted by means of provided levelling legs. Legs regulation varies from 38 to 50 mm.
*** Fuel tank capacity for charging density 0.8 kg/dm3

**** 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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