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Simplified boiler operation with intuitive controls. Mini Matic simply requires adding fuel to the storage tank - all other tasks are handled by KOSTRZEWA technology.
5 Class OMS - Monitoring and control system OMS System Patent VG - Variable Geometry Technology Ecodesign 2020
A1 Pellets A2 Pellets
A1 Pellets A2 Pellets
This boiler is subsidised in these countries:

Poland Germany
Mini Matic
11 kW 20 kW
Mini Matic See product
  • Passive house Passive house
  • Single-family house Single-family house
  • Small farm Small farm


Silent and easy to use for inexperienced users. The boiler simply requires adding fuel to the storage tank. No ash removal is required. A self-cleaning burner transfer the ash to the built-in ash collector cleaned by our service engineer as part of an annual inspection. Intuitive room thermostat for boiler control as standard. Optional remote control using a smartphone or a desktop app with an interface similar to the room thermostat interface.



  • Mini Matic adapts its performance to the variations in quality of certified fuel (A1, A2) and adjusts the parameters accordingly.
  • An energy-efficient device with advanced auto-diagnostics systems preventing shut-down.
  • Mini Matic features a redundant start-up system.



If the boiler shuts down due to empty fuel storage tank, simply add fuel - the boiler with restart automatically and continue heating using previous settings.



A boiler with a built-in burner, storage tank, fuel feeder and ash collector enclosed in a uniform, modern housing.



  • Advanced boiler management system logics sets the optimal parameters and is compatible with other KOSTRZEWA devices - Mini Matic is compatible with our new products - heat pump and heat recovery ventilation unit. All devices can be controlled by a single controller.
  • OMS − fuel level measurement including low fuel reserve (patented KOSTRZEWA solution).
  • Flue draft monitoring and optimizing system
Tests and certificates

All our boilers are tested by an accredited testing laboratory - a member of the international Association of Accreditation.


The test results show that KOSTRZEWA products meet the emission requirements laid down in the Ecodesign Directive and guarantee user safety.


All boiler types undergo over 20 different tests including:

  • Boiler pressure test at 4 bar
  • Energy-efficiency and emission tests at 10%, 11% and 13% fuel oxygen content
  • Power input test in operation and standby mode
  • Functional closed-loop tests without auxiliary safety devices


Our boilers are included in the list of devices covered by the eco boiler grant schemes in many EU countries.

Mini Matic
Object power selection
Boiler power Heating surface
m2 m3
11 kW 40-200 100-500
20 kW 100-300 250-750
Surface is provided at ceiling height of 2.5 m.
11 kW 20 kW
Flue draught mbar 0,15 - 0,25 0,15 - 0,25
Water capacity l 116 116
Maximum working pressure bar 2 2
Test pressure bar 4 4
Flue gas temperature at rated output °C 82,1 102,8
Flue gas temperature at minimum output °C 74,7 74,6
Flue gas mass flow at rated output kg/s 0,00599 0,01091
Flue gas mass flow at minimum output kg/s 0,00357 0,00606
Flue connector diameter mm 127 127
Flow resistance at 10 K mbar no data no data
Flow resistance at 20 K mbar no data no data
Rated heat output kW 3,4 - 11,1 5,7 - 20,4
Efficiency at rated output % 94,7 94,4
Efficiency at minimum output % 89,0 91,0
Boiler class as per EN 303-5:2012 5 5
Combustion time at rated output
(fuel calorific value: 18,305 kJ/kg)
h 45 26
Temperature controller settings range °C 50 - 80 50 - 80
Minimum water return temperature °C 45 45
Fuel type Class Sawdust granulate (pellets) made to EN 303-5:2012 / PN- EN ISO 17225-2 Class C1 / A1)
Test fuel used in the certification procedure - A1.
Also compatible with A2.
Storage hopper capacity l 151 163
Hopper dimensions mm 200 x 570 210 x 570
Power supply V / Hz / A 230, 50, 2 230, 50, 2
Power input at rated output W 81 90
Power input at minimum output W 25 30
Power input in STANDBY mode W 3 3
Maximum power input W 380 380
Maximum noise level dB 35 35

PELLET is a processed waste timber compressed under high pressure without use of any bonding agents.


PELLET CLASSES TO PN-EN ISO 17225-2:2014-07:

A1 - ash content ≤0.7% Premium quality product
A2 - ash content ≤1.2%
B - ash content ≤2%

PELLET - eco-friendly, high-energy clean fuel!


Operating and monitoring system for solid fuel boilers. Our boilers are fitted with a system monitoring fuel level in the storage tank and the amount of ash in the ash pan to guarantee convenient and comfortable operation. In many boilers without a similar system available on the market user must remember to refill fuel and remove ash regularly. The system, developed by KOSTRZEWA, measures and notifies the user in advance on required actions (fuel refilling or ash removal). Notifications are displayed on a boiler controller screen and a room temperature controller screen. Our solution is patent protected.


Certificate 486.17 KB
Declaration of Conformity 365.55 KB
Product data sheet 577.76 KB

Informacje zawarte na stronie internetowej nie stanowią oferty w rozumieniu art. 66 Kodeksu Cywilnego z dn. 23.04.1964 r. Księga pierwsza, Tytuł IV, Dział II.