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Celsius C 25 - 29 simplified system

Celsius C 25 - 29 simplified system
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Celsius C 25 - 29 simplified system content:

  • Celsius C 25 - 29 solid boiler
  • Celsius boiler anticondensing F-package
  • Celsius safety heat exchanger
  • System controller (11E)
  • Celsius C 25 - 29 solid fuel boiler



    The boilers are suitable for family houses, small apartments, foil and greenhouses, small factory halls and workshops gravity or pump heating.
    These boilers are easy and economical to operate. Their firebox is made of 5 mm thick steel by welding folded edges. These boilers have 3 steel plate doors that serve cleaning, filling, air control.
    Celsius C boilers are easier to clean because of the boiler width- door without sill.



    • Celsius heating system will provide even heat distribution in comparison to an open fire place or stove.
    • Able to produce drinkable hot water,
    • Firebox is 5mm thick resistant steel,
    • Operation is easy and economical,
    • It has big firebox for comfortable loading,
    • Able to connect with other heating sources (maximum 3 bar pressure) in the one heating system.
    • Suitable for radiator, underfloor or combined heating systems.


    Recommended fuels:

    • Firewood and other wooden waste


    • Boiler thermometer
    • Filling/draining trap
    • Fire grates (grills)

    Optional accessories:

    • Heating system controller
    • Celsius anticondensing reycling pump unit to 65 Kw [R]
    • Slag scrapper, ashpan
    • Celsius boiler cleaning package



    Modul C 25 - 29
    Firing door size (mm) 310*330
    Maximum heat output (kW) 29
    Heating-system dependant heatable air-space(m3) 300-500
    Fuel-dependant efficiency (%) 85
    Heating water connection (") 2
    Uptake connection (mm) 150
    Height (mm) 1140
    Width (mm) 555
    Depth (mm) 565
    Weight (kg) 188
    Water volume (l) 73
    Max. operating pressure (bar) 2
    Max. operating temperature (°C) 90
    Test pressure (bar) 4
    Draught demand (g/s) 31,8
    Firebox size (mm) (height*width*depth) 520*330*400





    Height of boiler


    Width of boiler


    Depth of boiler


    Cleaning door


    Firing door


    Secondary draught regulator slot


    Ash removal door (primary draught regulator)


    Forward water connection


    Return water connection


    Uptake connection


    Automatic draught regulator connection


    Manual and automatic draught regulator option


    Filling/draining tap connection


    Boiler thermometer connection






    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.








    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






    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 (ki) 1 (be)



    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
  • Weight
    205 kg/pc
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