Short Description
The Niko Therm Extreme pellet boiler is a steel water-heating boiler with a water jacket. It is classified as Class 5 according to the BDS EN 303-5:2021 standard and is designed for connection to heating systems in single-family houses, administrative buildings, and industrial workshops.
The boiler features a highly efficient three-pass heat exchanger with vertical flue gas tubes and operates in a non-condensing mode. The inner body of the combustion chamber is made of high-quality sheet steel with a thickness of 5 mm. It achieves an efficiency of up to 92.2% at reduced power and can operate with wood pellets, agro pellets, and mixed pellets.
Compatible Fuel Types
Niko Therm Extreme pellet boilers are designed to operate efficiently with various types of biofuels, ensuring high efficiency, cost-effectiveness, and reliable operation throughout the heating season. Niko Therm Extreme boilers burn the following fuel types effectively:
Agro Pellets
They are made from plant waste such as straw, sunflower husks, corn residues, and other agricultural raw materials. They provide an economical and environmentally friendly heating solution.
Wood Pellets
They are produced from compressed wood shavings and sawdust. They are characterized by high calorific value, low moisture content, and clean combustion.
Calibrated wood chips
It consists of shredded wood material – branches, bark, and wood waste. It is suitable for heating larger industrial and production facilities.
Technical Specification
| Model | Dimensions | Extreme 20 |
|---|---|---|
| Nominal power | kW | 19.8 |
| Reduced power | kW | 6.63 |
| Maximum operating pressure | Bar | 2 |
| Test pressure | Bar | 4 |
| Maximum water temperature | ℃ | 90 |
| Flue gas temperature at nominal power* | ℃ | 99 |
| Flue gas temperature at reduced power* | ℃ | 51 |
| CO emissions (10% oxygen) at nominal power | Mg/m3 | 449 |
| CO emissions (10% oxygen) at reduced power | Mg/m3 | 353 |
| Fuel type and size | Wood pellets, agro pellets, mixed pellets | |
| Overall dimensions H/W/D | mm | 1625/529/1378 |
| Pellet consumption | kg/h | 4.625 |
| Water jacket volume | 98 | |
| Expansion vessel type | Closed | |
| Hopper capacity: mounted / free-standing | kg | 115/150 |
| Net weight | kg | 262 |
| Chimney draft | Pa | 12±2 |
| Inlet pipe D2 | 1 1/4" | |
| Outlet pipe D1 | 1 1/4" | |
| Thermo-hydraulic pipe D3 | mm | M12x1.5 |
| Flue diameter - M | mm | 148 |
| Distance between inlet and outlet pipes A/B | mm | 240/781 |
| Distance between inlet and outlet pipes E/F | mm | 771/240 |
| Efficiency at nominal power* | % | 91.23 |
| Efficiency at reduced power* | % | 92.2 |
* Results obtained using Niko Therm RB STAR burner and C1 class pellets.