Charging Boilers

Defro Classic Plus

DEFRO CLASSIC PLUS boilers with manual charging are equipped with horizontal flue gas channels and are adapted for upper combustion of solid fuels. They are intended for heating of facilities with area up to 250 m2. Primary fuel - chestnut hard coal, fine coal, secondary fuel: mix of chestnut coal and fine coal, seasoned wood and wooden wastes. Combustion process with forced air blowing, controlled by an electronic controller, what allows more precise adjusting of temperature and improvement of operation comfort. Multi-point air supply system to the fuel charging zone increases stability and efficiency of boiler operation.

gwarancja 4 4 years of warranty for heat exchanger tightness of heat exchanger; 2 years for the remaining components and efficient operation of the boiler;
stal-6 heat exchanger made of certified boiler steel / grade P265GH/ of 5 mm thickness from steel mills of Arcelor Mittal Poland S.A. division Cracow and U.S. Steel Kosice s.r.o;
sprawnosc-82.png high thermal efficiency up to 82% thanks to increased recovery of heat from flue gases - multidraught system of horizontal flue gas ducts;
powietrze-wielopunkt.png multipoint air supply system;
sterownik-4-dotyk.png electronic control of boiler servicing of two pumps;
ruszt-wodny.jpg water-cooled grate;
klamka.jpg adjustment of doors pressing force;

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 6 10 15 20 25
Nominal power
kW 6 10 15 20 25
Minimal power
kW 1,8 3,0 4,5 6,0 7,5
Power range kW 1,8-6 3,0-10 4,5-15 6,0-20 7,5-25
Heating area m2 0,9 1,6 1,7 2,0 2,3
Area of heated rooms* m2 to 100 to 140 to 170 to 220 to 250
Single fuel charging kg ~12 ~19 ~19 ~23 ~31
Fuel consumption** kg/g 1,3 1,5 1,8 2,2 2,9
Optimum thermal efficiency % ~80
Max. permissible operation pressure bar 1,5
Required flue gas draught Pa 18 20 22 23 26
Max. temp. of water on supply °C 65/85
Temperature of water  return min. °C 55
Range of temperature control °C 45-85
Boiler weight** kg
168 241 245 280 310
Boiler water tank capacity l 33 52 55 62 73
Chimney section cm x cm 14x14 16x16
Chimney section Ø mm 160 180
Chimney section m 5,5 5,5 6 7 7
Width mm 462 550 550 600 600
Depth mm 765 930 930 940 1010
Height mm 1225 1435 1435 1485 1540
Dimensions of charging chamber
and charging hole
mm 258x188 308x238
Diameter of supply and return Dn   1½”
Diameter of the drain   ½”
Diameter of flue mm 127 159 178
Supply V/Hz ~230V/50Hz
Power consumption W 39
Height to bottom edge of the flue mm
795 965 965 1015 1065



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

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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