Centrometal CentroPlus 25, 25kW

Dual chamber solid fuel boiler for central heating of premises up to 150m². 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.

€2,653.00 €2,210.83
Availability: In stock

Steel boiler with natural air feed, controlled by a thermostatic draught regulator. Solid fuel boilers CentroPlus range in nominal output from 25 to 50kW to satisfy the heating demands of medium 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. Design with two combustion chambers having a common water mantle- one chamber for solid fuel burning (wood, coal) and one for a burner.


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, both the combustion chambers' surfaces are 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.

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 right combustion chamber door. 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 CentroPlus wood boiler

CentroPlus Schematic

1 - Thermometer
2 - Pump Thermostat connection
3 - Safety Line
4 - Water heater outlet (only for CentroPlus-B)
5 - DHW recirculation
6 - Water heater inlet (only for CentroPlus-B)
7 - Water outlet
8 - Thermal safety valve connections 3/4" ( Safety heat evacuator)
9 - Water inlet
10 - Filling / draining
11 - Ash Tray
12 - Door for installation of pellet/oil burner
13 - Flue gas exhaust
14 - Thermostatic draught regulator

This appliance complies with EN 303-5 and is manufactured according to standarts ISO 9001 and ISO 14001

More Information
Warranty 2 Years
Weight (kg) 464.0000
Country of Manufacture Croatia
Heat output (kW) 25
Approximate heating surface (m²/ft²) 150
Approximate heating capacity (m³) 405
Dimension Depth (mm) 1065
Dimension Width (mm) 915
Dimension Height (mm) 1260
Construction material Steel
Mantle volume (L) 175
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
Flue (mm) 150
Required chimney draught (Pa) 17
More Information
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 1105
Cooling loop Yes
Safety heat evacuator inlet/outlet 3/4"
Overheating protected Yes
Air intake flap Yes
Height of Flue Pipe 955
Height of Return Water Pipe 505
Height of Water Drain Valve 105
Drain 1/2"
Ash and soot container Yes
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