Centrometal EKO-CKB P 35, 35kW

Solid fuel boiler for central heating of premises up to 200m². Constructed for solid fuel burning - wood, wood briquettes class B and coal. It also has the option for attaching a burner which allows to be converted to pellets, oil or gas.

Please create an account for viewing our prices or visit our retail site.
Availability: In stock

Steel boiler with natural air feed, controlled by a thermostatic draught regulator. Solid fuel boilers EKO-CKB P range in nominal output from 20 to 40 kW to satisfy the heating demands of medium to large sized spaces. They are engineered for burning solid fuel - wood, wood briquettes class B and coal, and provide the option for fitting pellet, oil or gas-fired burners. The EKO-CKB P series has a built-in chrome-nickel water heater which allows fast heating of potable water.


The boiler is manufactured from high quality steel with 5mm thickness. The combustion chamber is precisely sized and has a large heat exchanging surface. Large firebox door ensures easy loading even of large chunks of wood.

Outer casing and insulation are not pre-assembled to simplify transport and minimize the risk of damage. 


To increase the heat exchange, the combustion chamber's surface is ribbed and designed for a three-pass flue gas flow. The mantle completely envelops the firebox for maximized usage of the heat. The boiler's body is insulated from the external conditions by thick high temperature resisting wool. This series uses a thermostatic draught regulator that opens or closes a flap on the lower door, depending on the amount of air needed for the burning process. It comes with a built-in thermostat for controlling central heating pump.

Built-in water heater

Made of high quality stainless steel under strict hygienic standarts. Ensures fast domestic hot water production and doesn't need a circulation pump in order to operate.

Safety devices

For a safe and reliable operation of the boiler, a number of safety devices are installed

- Thermostatic draught regulator;

- Pressure relief valve 3 bar incl.in the delivery set;

- Safety heat evacuator: a tap-water filled line passes through the uppermost part of the boiler body. In case of overheating it is triggered open by a thermostatic valve (not included) to evacuate the heat off the boiler.


The central heating boiler can operate with natural untreated wood, but also with coal and compressed solid fuels such as briquettes. Maximum length of the logs is 500mm. Fuel moisture should be 20% or lower.

In order to use the maximum caloricity of the fuel, the wood logs should be dried for a prolonged period of time. High moisture levels reduces caloricity and the output power of the boiler.


This series of boilers is manufactured for burning solid fuel, with the option of adaptation to a different kind of fuel. This is possible by mounting a pellet, gas or an oil burner on the lower door opening. A flange is also needed to mount the burner (optional).

When converting the boiler to another fuel, a number of options are available, such as turbulators and burner control units.


Schematic of the main features of a EKO-CKB P wood boiler

EKO-CKB P Schematic

1 - Thermometer
2 - Thermal safety valve connection 1" ( Safety heat evacuator)
3 - Openings for draught regulators
4 - Water heater outlet
5 - Circulatioin
6 - Water heater inlet
7 - Boiler water inlet
8 - Thermal safety valve connection 1" ( Safety heat evacuator)
9 - Flue gas exhaust
10 - Boiler water outlet
11 - Burner flange
12 - Primary air flap

This appliance complies with EN 303-5 and EN304. Manufactured according to standarts ISO 9001 and ISO 14001

More Information
Warranty 2 Years
Weight (kg) 322.0000
Country of Manufacture Croatia
Energy efficiency class A
Heat output (kW) 35
Range of heat output (kW) 30-35
Approximate heating surface (m²/ft²) 200
Approximate heating capacity (m³) 540
Depth (mm) 1020
Dimension Width (mm) 615
Dimension Height (mm) 1610
Loading door size (Height, Width), mm 421x322
Construction material Steel
Mantle volume (L) 98
Water heater capacity (L) 80
Insulation boiler high efficiency thermal wool
Insulation doors high efficiency thermal wool
Maximum system pressure (bar) 2.5
Maximum water temperature (°C) 90
Recommended fuel wood, humidity 20%; wood briquettes ; coal
Fuel Type Wood, Briquettes, Coal
Maximum length of the firewood logs (mm) 500
More Information
Flue (mm) 160
Required chimney draught (Pa) 20
Maximum temperature of flue gas (°C) 190
Exhaust Location Backside
Control of central heating pump Yes, Built-in thermostat
Electric power supply (V/Hz) 230/50
Thermostatic draught regulator Yes
Thermometer Yes
Certification CE
Cold water inlet 1 1/4"
Hot water outlet 1 1/4"
Height of Hot Water Outlet 1390
Cooling loop Yes
Air intake flap Yes
Height of Flue Pipe 930
Height of Return Water Pipe 1097
Height of Water Drain Valve 142
Upper inspection door (Height, Width), mm 421x273
Drain 1/2"
Ash and soot container Yes
Ship Bundle Items Together
Write Your Own Review
You're reviewing:Centrometal EKO-CKB P 35, 35kW