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New version
with external storage hopper. Our smallest pellet boiler now available with variable geometry Platinum Bio VG burner!

For use with all types of wood pellets (class A1, A2, B) .
A+ Energy Class Patented design VG - Variable Geometry Technology OMS - Monitoring and control system Ecodesign 2020 5 Class
A1 Pellets A2 Pellets B Pellets A1 Pellets/Oat
A1 Pellets A2 Pellets B Pellets A1 Pellets/Oat
This device is subsidised in these countries:

Poland Slovakia Czech Republic
Mini Bio Luxury B
12 kW 15 kW 21 kW
Mini Bio Luxury B See product
  • Passive house Passive house
  • Single-family house Single-family house
  • Multi-family house Multi-family house
  • Small farm Small farm


We offer a unique product - a miniature boiler with many advantages. With its variable geometry Platinum Bio VG burner - innovation on a European scale - Mini Bio Luxury with external storage hopper can be used with all types of pellets (class A1, A2 and B). Ceramic inserts in the burner and heat exchanger improve boiler efficiency and keep fuel consumption to a minimum.  



Our boilers are virtually maintenance-free to guarantee the highest comfort of operation. Automatic boiler start-up and shut-down with fuel level and ash content monitoring and notification in advance when fuel refilling or ash pan cleaning is required. The number of visits to the boiler room can be kept to a minimum.



High quality steel and the highest quality components guarantee many years of failure free operation. All new models are thoroughly tested for many months before marketing. All our boilers are individually tested for durability at min. 4 bar - a feature hardly ever found elsewhere.



We maintain an extensive service network. Over 200 qualified service engineers provide warranty and post-warranty services in Poland and abroad. Service can be arranged using our internet platform at



All boiler and central heating system functions can be remotely monitored using a PC or a smartphone (optional).



Even the best boiler isn’t enough. We offer complete boiler room and heating system solutions. We offer advanced solutions including pellet storage, pneumatic fuel feeding, cascade automation, weather compensated CH system control, DHW and buffer tank control, return protection, fuel and ash sensors, heat pump, solar panel and gas boiler control.

Tests and certificates

Our boilers are tested by an accredited testing facility - a member of the international Association of Accreditation.


The test results show that KOSTRZEWA products meet the emission requirements laid down in the 5 class 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 oxygenation
  • Energy consumption test in operation and standby mode
  • Operational test in a closed loop system without auxiliary safety devices
    Our boilers are included in the list of devices qualifying for a subsidy in many EU countries.


Compatible with certified class A1 pellet and economy class A2 and B pellet. Regular slag (cinder) removal is no longer needed even with low quality pellets. The burner is cleaned automatically in a continuous operation mode. Platinum Bio VG burner is patent protected (patent no. 228615, Patent Office of the Republic of Poland).

  OMS (operating monitoring system)

OMS (operating monitoring system)

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.



A virtually maintenance-free pneumatic device feeding pellet at a large distance from the storage area directly to the boiler including multiple sensors for a fully automatic operation.  If MINIMUM level is detected in the buffer tank, it is immediately refilled to the MAXIMUM level. The device can also be timer programmed, i.e. the buffer tank will be refilled to the MAXIMUM level at a pre-set date and time.



with a colour touch control panel - an advanced device monitoring the combustion process in the boiler and the pellet burner.


System controls: fuel feeding from the storage hopper, fuel feeder, pressure blower, igniter, CH pump, DHW pump, boiler pump, fuel level sensor, outdoor temperature sensor, return temperature sensor and mixing valve actuator


Optional accessories: external temperature sensor, CH sensor, DHW sensor, return temperature sensor, colour ecoSTER TOUCH control panel with remote boiler control, programmable wireless 7-day thermostat, programmable wired 7-day thermostat, adjustable temperature sensor, EcoLAMBDA oxygen sensor, auxiliary extension module (B), auxiliary extension module (C) and EcoNET internet module.

Mini Bio Luxury B
Object power selection
Boiler power Heating surface
m2 m3
12 kW 50 - 200 125 - 500
15 kW 85 - 200 212 - 500
21 kW 100 - 300 250 - 750
Surface is provided at ceiling height of 2.5 m.
12 kW 15 kW 21 kW
Flue draught mbar 0,15-0,20 0,15-0,20 0,15-0,20
Water capacity l 47 90 90
Maximum working pressure bar 2 2 2
Test pressure bar 4 4 4
Flue gas temperature at rated output °C 126,5 95,6 104,4
Flue gas temperature at minimum output °C 83,9 71,2 71,1
Flue gas mass flow at rated output kg/s 0,00837 0,00832 0,0106
Flue gas mass flow at minimum output kg/s 0,00396 0,00358 0,00515
Flue connector diameter mm 127 159 159
Flow resistance at 10 K mbar 9,4 16,4 22,8
Flow resistance at 20 K mbar 14,1 4,6 6,4
Rated heat output kW 12 15 21
Heat output range kW 3,6-12 4,5-15 6,3-21
Efficiency at rated output % 90,6 93,1 93,9
Efficiency at minimum output % 89,2 91,2 91,4
Boiler class as per EN 303-5 5 5 5
Combustion time at rated output
(fuel calorific value: 17,280 kJ/kg)
h 42 40 28
Temperature controller settings range °C 50-80 50-80 50-80
Minimum water return temperature °C 45 45 45
Fuel type Class Sawdust granulate (pellet made according to EN ISO 17225-2 class A1)
Test fuel used in the certification procedure - A1.
Also compatible with A2 and B class pellet..
Storage hopper capacity l 295 295 295
Hopper dimensions mm 550x550 560x560 560x560
Power supply V / Hz / A 230 / 50 / 2 230 / 50 / 2 230 / 50 / 2
Power input at rated output W 110 89 120
Power input at minimum output W 32 28 34
Power input in STANDBY mode W 2 2 2
Maximum power input W 494 477 477
Maximum noise level dB 52 52 52

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!

Ceramics is everywhere - the combustion chamber, the heat exchanger and the burner are coated with advanced ceramics to improve the combustion process and efficiency and to reduce the emission. During operation, the ceramics heats up to over 1,000°C to improve the biomass combustion efficiency.


Flue gas vortex generators retain energy inside the boiler.


295 l tank installation manual 2.05 MB

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.