Furnaces with feeding screw eco pea-fired

KWM-SGR boiler

50-150 kW
  • KWM-SGR heating furnaces were designed to produce heat energy for heating flat buildings and industrial buildings as well as for co-operating with utilisable hot water tank also in summer season.
  • They are fully environment friendly and were granted the “ecological safety sign” issued by the Institute of Chemical Processing of Coal in Zabrze.
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Basic Information



Heating furnaces are being delivered as mounted units ready to be installed and are equipped to elements listed below:

  • motoreducer-propelled fuel feeding screw
  • self-cleaning retort furnace made of cast-iron
  • blow-in fan
  • electronic controller with option of utilisable hot water
  • additional grate made of cast-iron (up to power rating of 75 kW)
  • draught shutter
  • ash pan
  • service tool

Operation principles

KWM-SGR heating furnaces are high-tech, fully automated devices requiring only minimum attendance. They are equipped to high quality coal feeding system and were designed for highly efficient combustion of pit-coal of pea size grade. Fuel for combustion process is transported automatically by means of feeding screw from fuel tank located next to the heating furnace.

All processes leading to combustion of the fuel with portion of air supplied by blow-in fan take place in cast-iron-retort. Above the coal furnace there is cast-iron deflector-radiation panel that directs heat rays towards glow in order to fire up combustible gases and distributes combustion gases equally to heat exchanger. Ash resultant in final stage of combustion moves to retort periphery and then spontaneously falls down into ash pan equipped to furnace drawtray.

Efficiently working heating furnace furnace let on burning as much fuel as it is needed to keep temperature set by regulator. Regulator constantly measures water temperature in boiler and upon this basis controls fuel feeder unit and fan. In case the system was not equipped to utilisable hot water pump, controller regulates its operation at the same time. The heating furnace is easy to operate. Actions that need to be taken are regular fuel replenishment and removing ash from ash pan without necessity of blowing down the heating furnace.

After having the heating furnace fired up it does need constant attendance and can be operated continuously over heating season. In case of sustained power failure the heating furnace has additional cast-iron grate (up to 75 kW) for burning coal, wood and other kinds of solid fuels by standard procedure. There is a special option of installing fixed water grate available on request.

Modern solutions

Heating furnaces with automated fuel feeding system provide high-tech design solutions depending on installation requirements. Body of the KWM-SGR heating furnace consists of combustion chamber and heat exchanger both made of high quality attested steel.

It has convection ducts located in the upper part of the heating furnace (upper duct) formed as “shelves”, where one of them is made in a form of griddle with furnace tubes. Such construction of the heating furnace has significant influence on its life time and prompt attaining rating power. In previous version of the heating furnace KWM-SGR there was revision cleaning hole that facilitate access to convection ducts.

KWM-SGR heating furnaces are equipped to thermal-resistant furnace door and fill-up door with purpose-made thermal gasket in the front of the heating furnace body. Whole body was covered with high-grade thermal insulation which is protected by steel casing. KWM-SGR central heating furnaces must be installed according to standard PN-91/B-02413 and BN-71/8864-27 concerning open vent water heating installations safety and open vent expansion tank.


  • eco-pea coal

Price list

Check price list
Moc nominalnaWielkość powierzchni ogrzewanejCena nettoVATCena brutto
50 kW300-450 m29 780,49 zł2 249,51 zł12 030,00 zł
62 kW450-600 m210 772,36 zł2 477,64 zł13 250,00 zł
75 kW600-750 m214 715,45 zł3 384,55 zł18 100,00 zł
100 kW750-1000 m219 268,29 zł4 431,71 zł23 700,00 zł
150kW1000-1500 m226 504,07 zł6 095,93 zł32 600,00 zł


KWM-SGR boiler
Technical data KWM-SGR 50-150 kW
Type KWM-SGR506275100150
Rated powerkW506275100150
Min. powerkW1519233045
Heating surface5,06,07,510,514,0
Heated area300-
Fuel typeHard coal – boiler pea coal grade type 31 or 31.1 with the granulation/size of 5-25 mm, agglomerating capacity RJ < 10, humidity up to 15%, fine coal content up to 10%, softening temperature >=1150°C, volatile matter content 28-40%, sulfur <= 0,6%, calorific value 26 MJ/kg. Boilers with a fire grate may use hard coal or nut coal as fuel
Fuel consumption at the rated powerkg/h8,510,012,71725,5
Fuel bunker capacitykg200270
Boiler water capacityl182210245370390
Boiler’s weightkg59066078010961461
Size of the doorheightmm220220220220300
Depth of furnacemm540590640780848
Width of furnacemm450500600720848
Max. water temperature°C90
Max. working pressureBar1,5
Test pressureBar4,0
Thermal efficiency%>80
Required flue gas draftPa20-25
Required stack heightm810
Required stack hole cross-sectioncm²380480660960
Dimensions of flue cross-sectionheightmm190190210240270
Number of channels smoke4
Power consumption (230V/50Hz)W170260370


KWM-SGR boiler

KWM-SGRunit.50 kW62 kW75 kW100 kW150 kW


KWM-SGR boiler

ST – 480 controller

Functions performed by the controller:

  • Control of the fan and feeding screw or piston feeder
  • CH pump control
  • DHW pump control
  • Control of the floor pump
  • Control of the circulation pump
  • Control of the mixing valve actuator
  • The possibility to connect a room regulator with RS or traditional communication
  • The possibility to connect the ST-65 GSM module
  • The possibility to connect the ST-500 ETHERNET module
  • The possibility to control two valves with the use of additional ST-61 v4 lub ST-430 RS

Controller’s equipment:

  • Large graphic display facilitating the controller’s operation
  • CH temperature sensor
  • DHW, floor temperature sensor
  • Valve and return temperature sensor
  • External sensor (without cable)
  • Feeder temperature sensor (protection)
  • Thermal protection
  • Power supply cable
  • Pump power supply cables
  • Single-module panel casing for the boiler’s installation or in a metal casing