Combi 29 - 34 simplified system I.

Combi 29 - 34 simplified system I.
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Celsius Combi 29 - 34 simplified system I. content:

  • Celsius Combi 29 - 34 boiler
  • Pellet adapter door for connection pellet burner
  • Celsius boiler anticondensing F-package
  • Celsius safety heat exchanger
  • System controller (Euroster 11E)

Celsius Combi boiler

With pellet adapter door



The Celsius Combi Boiler is our most up to date boiler.

Celsius Combi boilers were developed to operate with either dry non-woody biomass or wood pellet (DIN+ quality, 6 mm diameter thick). Its structure is similar to that of a traditional wood burning boiler, however, its operation is a lot more economical with the use of highly efficient equipment. The boiler requires minimum maintenance and will continue to meet your heating requirements over its long lifetime. The boiler can be connected to any kind of central heating system, from radiator to floor heating.


The Celsius Combi Boiler with Wood Pellet burner is efficient and convenient because of:

  • Automatic turn on and turn off switching
  • Keeping fire and modulation (5 performance levels)
  • Increased savings due to possibility of 4 different pellet quality parameters.
  • Faster cleaning


These boilers are suitable for burning solid non-woody biomass and in auto mode Wood Pellets may also be used. Thanks to its special design the boiler can utilize both fuels with outstanding efficiency. Celsius boilers are suitable for gravity or pump controlled heating systems for family houses, workshops, various farm houses, agricultural halls, institutions and greenhouses. Celsius solid fuel burning boilers have different models which are sized by heat output to meet your individual requirements.



  • Fire grates (grills) 
  • Wooden pellet burner adapter door
  • Filling/draining trap







Height of boiler


Width of boiler


Depth of boiler


Boiler body


Exterior cover


Return water connection


Filling/draining tap connection


Upper door


Ash pan


Firing door (wood burning)


Pellet burner adapter door


Ash removal door (primary draught regulator)


Door opening handle




Heat exchangers


Grate (grill)


Safety valve or pressure guage


Uptake connection


Forward water connection


Thermometer connection


Automatic draugh regulator connection




Modul Combi 29 - 34
Firing door size (mm) 310*330
Maximum heat output (kW) solid/pellet 34/34
Heating-system dependant heatable air-space(m3) 350-550
Fuel-dependant efficiency (%) solid/pellet 82/92
Heating water connection (") 2
Uptake connection (mm) 150
Height (mm) 1140
Width (mm) 555
Depth (mm) 625
Weight (kg) 205
Water volume (l) 82
Max. operating pressure (bar) 2
Max. operating temperature (°C) 90
Test pressure (bar) 4
Draught demand (g/s) 39,6
Firebox size (mm) (height*width*depth) 520*330*460


Celsius combi energiacímke





Celsius safety heat exchanger



It protects the boiler and environment if the boiler is overloaded and the heating system can not heat distribute (There is not buffer tank and irregular usage).


Content of equipment:

  • Celsius safety heat exchanger
  • Vent valve
  • Thermostatic security valve (opening temperature 98°C)
  • Pressure security valve (2bar)


Applicable to the following boiler types:
Celsius classic, Celsius C and Celsius Combi boiler





F-Celsius anticondensing package to 65 kW


Kazánvédő csomag



Boiler protection unit to prevent condensation
Condensation is an often experienced phenomenon during the use of the solid fuel boilers which is always harmful, will cause lifespan shorthening, efficiency drop, and higher heating costs.


Content of equipment:

  • circulation pump (Grundfos UPM3 25-70 Hybrid)
  • pump hollander (ball tap) 1 piece
  • Celsius boiler protection valve
  • to 65kW KVS 7,2


Principle of operation:



1. Starting the system (heating the boiler)
After the launching of the boiler, the thermic valve is fully closed towards the user (gate A) and remains in this condition until the fluid is warmed up by the heating source, gets the opening temperature of the thermic valve (corresponding to the calibration value, f.i. 55°C). During this step the fluid sent by the boiler fully recycles through the by-pass (gate B) so the boiler temperature rises very quickly.



2. Loading the system (heating the tank)
Reaching the opening temperature (f.i. 55C), gate A proportionally starts to open while gate B proportionally starts to close. The boiler temperature slowly rises, giving energy to the end user, but the returning temperature will not decrease below the calibrated temperature (f.i. 55°C).



3. System operation
Starting from point 2, the flow temperature progressively increases to fully open gate valve A. This will correspondingly close gate valve B. This happens at approximately circa 10k higher than the calibration or opening temperature (therefore in this example at 65c). Now the installation is fully operational the supply fluid temperature can increase to set value.
For example, if the valve opening temperature is 55°C, then it is totally opened in the direction of A → AB in case of +10°C.




Euroster 11E pump controller


11E vezérlő egység


Central heating/Utility hot water system pump controller


Euroster 11E is a modern microprocessor-based controller used to control central heating (CH) system pump or utility hot water (UHW) system pump.

The Euroster 11E controller features the ANTY STOP function that prevents idle pump rotors against seizing. Once the heating season is over, every 14 days the function automatically turns ON the pumps for 30 seconds. To that end the controller must be left powered up.


The Euroster 11E controller may be operated in two modes: it may control CH system pump or UHW system pump. In the former mode the CH system pump is engaged if sensor temperature has exceeded the preset limit. In the latter mode the UHW system pump is kept running until sensor temperature reaches the preset value.

  • Set 1 has been complied for layouts in which CH system pump is control,
  • Set 2 has been complied for layouts in which UHW pump is controlled.


Connection diagrams


Central heating pump control mode:



1. Euroster 11E controller
2. CH boiler
3. Heat source temperature sensor
4. CH pump
5. Radiator (heat load)


Domestic hot water pump control mode:


11E hot water diagram


  1. Euroster 11E controller
  2. DHW tank temperature sensor
  3. DHW tank
  4. DHW pump
  5. CH (wood pellet) boiler
  6. CH pump
  7. Radiator (heat load)



Elements of the controller:


11E display


  1. Name of the controlled parameter
  2. Heat source (boiler) 
  3. Manual operation mode (icon lit while the temperature is manually controlled)
  4. Alarm – (icon blinks in case of an alarm)
  5. State of the heat source
  6. DHW system pump icon lit while the pump is running
  7. CH system pump icon lit while the pump is running (CH system control mode)
  8. Heat source and other parameter value
  9. DHW tank temperature sensor icon
  10. Menu option number


Technical features:


Min. temperature Max. temperature
Controlled temperature 20 80
Hysteresis 2 10
Temperature sensor correction -5 5
Manual operation 0 (out) 1 (in)



Operating voltage 230V, 50Hz
Ratted wattage 1,6W
Output load of circuit pump 200W
Potential independent output 100W
Environmental temperature 0 - 65°C
Temperature measurement range 0 - 110°C
Operation temperature range 20 - 80°C
Hysteresis 2 - 10°C
Temperature accuracy 1°C
Protection IP40
Display LCD


Válasszon teljesítményt (kW)