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Midi Bio NE offers a synergy of quality and economy.

The device has been awarded an ECODESIGN certificate, features A+ energy rating, energy efficiency and emission standards to Directive 2009/125/EC of 21 October 2009 and the COMMISSION REGULATION (EU) 2015/1189.

Compatible with any wood pellet type (class: A1, A2, B).
A+ Energy Class 5 Class Ecodesign 2020 OMS PRO - Monitoring and control system
A1 Pellets A2 Pellets B Pellets
A1 Pellets A2 Pellets B Pellets
This device is subsidised in these countries:

Poland Slovakia United Kingdom
Midi Bio NE
42 kW 52 kW
Midi Bio NE See product
  • Multi-family house Multi-family house
  • Small farm Small farm
  • Large farm Large farm
  • Industrial and public buildings Industrial and public buildings


Our new boiler is an efficient and eco-friendly solution designed for large apartment buildings and industrial facilities. The boiler heat exchanger features a ceramic chamber for high fuel economy, lower emission and higher efficiency and flue gas vortex generators retaining energy inside the boiler.



Highest quality materials and components by renown manufacturers guarantee the highest reliability of our boilers. Regular maintenance and annual inspections guarantee failure-free operation for over a dozen years.



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 (OMS System). The number of visits to the boiler room can be kept to a minimum.



Innovative rotary PLATINUM BIO SPIN burner guarantees maintenance-free combustion of class A1, A2 and B wood pellets. The technology used allows to purchase pellet up to 50% cheaper than available for owners of other boilers (usually more expensive class A1 pellets).



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



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



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 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 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.



A remote monitoring and operating system developed by KOSTRZEWA for large pellet boiler rooms. The control system of a boiler and its function often does not meet all the requirements of the owner or boiler room operator. We have developed OMS PRO to provide additional functions: remote monitoring of the boiler room parameters, boiler cascade system monitoring, auxiliary heat source control, fuel storage and feeding system control, emergency and reserve conditions monitoring and many other functions. OMS PRO also allows real-time monitoring by our service department with remote access and technical support.



An innovative burner with a rotating combustion chamber for granulated biomass fuels with ash content up to 2% (pellet class A1, A2, B); patented at the Patent Office of the Republic of Poland. 2nd generation Fuzzy Logic controller and two-section menu for reduced fuel consumption by up to 20% and reduced component wear compared to other available burners (reduced number of burner start-ups significantly reduces the amount of energy used). Burner cleaning has never been this easy - mechanical cleaning of the combustion chamber through the rotation of Platinum Bio SPIN’s grate. The rotation frequency is programmed to remove excessive ash depending on the fuel used to reduce burner shutdowns interval from 3 days to about 2 weeks (depending on the ash content of the fuel).



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.



Galvanized and machine manufactured pellet storage hoppers are used as intermediate stores. The storage hoppers can be refilled manually or automatically from another store using Pellets Vacuum system. Available storage hopper capacities allow to position the boiler anywhere in the boiler room and extend the boiler operation time without manual refills. Optional storage hoppers from 295 l up to 1540 l capacity (approx. 1 tonne of pellet) are available.

Midi Bio NE
Object power selection
Boiler power Heating surface
m2 m3
42 kW 200 - 500 m2 500 - 1250 m3
52 kW 300 - 750 m2 750 - 1875 m3
Surface is provided at ceiling height of 2.5 m.
42 kW 52 kW
Flue draught mbar 0,15-0,25 0,15-0,25
Water capacity l 166 195
Maximum working pressure bar 2 2
Test pressure bar 4 4
Flue gas temperature at rated output °C 122,2 118,8
Flue gas temperature at minimum output °C 76,3 74,4
Flue gas mass flow at rated output kg/s 0,028 0,031
Flue gas mass flow at minimum output kg/s 0,013 0,014
Flue connector diameter mm 159 159
Flow resistance at 10 K mbar 11,15 19,05
Flow resistance at 20 K mbar 1,94 4,90
Rated heat output kW 42 52
Heat output range kW 12,6-42 15,6-52
Efficiency at rated output % 92,7 93,5
Efficiency at minimum output % 93 94,1
Boiler class as per EN 303-5 5 5
Combustion time at rated output
(fuel calorific value: 17,280 kJ/kg)
- tank 1510 l (900 kg)
h 103 83
Temperature controller settings range °C 50-80 50-80
Minimum water return temperature °C 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, 470, 850, 1510, 1540
Power supply V / Hz / A 230, 50, 2 230, 50, 2
Power input at rated output W 107 132
Power input at minimum output W 34 40
Power input in STANDBY mode W 3 3
Maximum power input W 930 930
Maximum noise level dB b.d. b.d.


User manual 5.33 MB
User manual - Regulator 3.75 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.