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The boiler meets the emission requirements laid down in the Ecodesign Directive.

Features OMS (Operating Monitoring System) - an operating and monitoring system for solid fuel boilers.
OMS - Monitoring and control system OMS System Patent A+ Energy Class Ecodesign 2020 5 Class
A1 Pellets A1 Pellets/Oat
A1 Pellets A1 Pellets/Oat
This boiler is subsidised in these countries:

Twin Bio NE
12 kW 16 kW 24 kW
Twin Bio NE See product
  • Passive house Passive house
  • Single-family house Single-family house
  • Multi-family house Multi-family house

TWIN BIO NE is the result of many years of experience in boiler manufacturing. Designed for households with large boiler rooms suitable for installation of a boiler with a 290 l storage hopper. Optional storage hoppers up to 1,386 l (1 tonne of pellet) are available. The boiler is a cost-effective device for burning biomass including pellet or pellet/oats mixes.


OMS monitors fuel level and ash content. User is informed in advanced that the fuel storage must be refilled and the ash pan requires cleaning.


Reduced fuel consumption with Twin Bio NE. A unique design and advanced ceramic inserts for over 90% efficiency.


Our boilers guarantee failure-free operation for many years. High quality steel and the highest quality components. 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.


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 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.


Compact, silent and energy-efficient.


automatic burner start-up, automatic burner modulation with 2nd Generation Fuzzy Logic, flame control with a photocell, low thermal inertia during start-up and shutdown, low power input, burner temperature control for highest safety, three-stage start-up to prevent gas explosions, AUTOSTART after power loss - the current settings are stored, separate primary and secondary air ducts for reduced CO emission (emission levels similar to gas and oil burners), automatic cleaning function - automatic slag removal from the grate (not available in the gravity fed models), oats - burner design allows use of oats as a fuel, ceramic insert - reduced emission and higher efficiency.

  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.




An advanced device monitoring the combustion process in the boiler and the pellet burner.


fuel feeding from the storage tank, fuel feeder, pressure blower, igniter, CH pump, DHW pump, fuel level sensor, boiler/buffer tank pump, heating circuit mixing valve - module B (optional), recirculation pump - module B (optional), buffer tank - module B (optional), two auxiliary mixing valves - module B (optional), two auxiliary mixing valves - module C (optional).


external temperature sensor, CH sensor, DHW 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, C) and EcoNET internet module.

Twin Bio NE
Object power selection
Boiler power Heating surface
m2 m3
12 kW 50-200 125-500
16 kW 85-200 212-500
24 kW 100-300 250-750
Surface is provided at ceiling height of 2.5 m.
12 kW 16 kW 24 kW
Flue draught mbar 0,15-0,25 0,15-0,25 0,15-0,25
Water capacity l 44 58 65
Maximum working pressure bar 2 2 2
Test pressure bar 4 4 4
Flue gas temperature at rated output °C 107,8 113 136,2
Flue gas temperature at minimum output °C 72,5 78,5 81,8
Flue gas mass flow at rated output kg/s 0,00922 0,0097 0,0137
Flue gas mass flow at minimum output kg/s 0,00431 0,0048 0,0068
Flue connector diameter mm 127 159 159
Flow resistance at 10 K mbar 12 1,7 3,8
Flow resistance at 20 K mbar 4 0,5 1,1
Rated heat output kW 12 16 23
Heat output range kW 3,6-12 4,8-16 6,9-23
Efficiency at rated output % 90,2 91,2 88,4
Efficiency at minimum output % 89,7 no data no data
Boiler class as per EN 303-5:2012 5 5 5
Combustion time at rated output
(fuel calorific value: 17,280 kJ/kg)
h 66 72 48
Temperature controller settings range °C 50-80 50-80 50-80
Minimum water return temperature °C 45 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 A1/oat.
Storage hopper capacity l 290 290 290
Hopper dimensions mm 737x602 737x602 737x602
Power supply V / Hz / A 230 / 50 / 2 230 / 50 / 2 230 / 50 / 2
Power input at rated output W 90 82 128
Power input at minimum output W 30 23 27
Power input in STANDBY mode W 2 3 3
Maximum power input W 490 456 459
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.


Watch a video presentation of Twin Bio boiler (with Platinum Bio burner)


Attention! Boilers for the Polish market do not have an emergency grate for wood.


290 l tank installation manual 1.75 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.