For the latest wood boilers types that are one of the only wood boilers to meet European requirements, as well as certified is the Viadrus U22 Economy range .
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Viadrus U22 Economy is a pyrolytic cast iron boiler with manual loading of fuel for ecological wood burning. The boiler can operate in gravitational heating systems without the use of a pump. Combustion chamber has been designed in such a way as to enable fuel combustion with natural exhaust extraction without the use of a fan.
- 10-year warranty on the cast iron body
- threaded ferrules for easy installation
- Effectiveness up to 91%
- meets the conditions of 'Ekodesign'
- meets the requirements of emission class 5 according to ČSN 303-5
- large heat extraction from the flue gas ducts
- meets the strict requirements of the German emission standard BlmSchV Stufe 2
- low fuel consumption
- easy to operate and maintain
- patented ViaBurn combustion chamber system
- low exhaust temperature (approx. 140 - 180 °C)
- operation without electrical power supply (without forced exhaust gas extraction and without circulation pump, except for systems with buffer tank)
| Boiler Size/Type | S.I | 16 | 21 | 25 | 30 | 34 | 38 | 41 |
| Energy class | • | A+ | A+ | A+ | A+ | A+ | A+ | A+ |
| Nominal Power | kW | 16 | 21 | 25 | 30 | 34 | 38 | 41 |
| Efficiency | % | 89,1 | 89 | 89 | 88,7 | 91 | 90,4 | 90,3 |
| Boiler class | [-] | 5 |
| ECO DESIGN | [-] | + |
| Combustion chamber depth | mm | 280 | 370 | 370 | 480 | 590 | 590 | 590 |
| Recommended length of wood pieces | mm | 350 | 350-500 |
| Combustion chamber volume | dm3 | 32 | 39 | 41 | 51 | 63 | 65 | 67 |
| Approximate fuel consumption at nominal power | kg/h | 3,9 | 5,1 | 5,9 | 7,2 | 8,5 | 9,4 | 10,2 |
| Temperature of exhaust gases at nominal power | ºC | 140-190 |
| Sizes - Height × Width | mm | 1130 x 625 |
| - Depth (A) | mm | 890 | 1000 | 1000 | 1110 | 1220 | 1220 | 1220 |
| Boiler weight | kg | 348 | 410 | 410 | 472 | 534 | 534 | 534 |
| Dimensions of the loading bay | mm | 310x236 |
| Required chimney draught | Pa | 13 | 16 | 18 | 21 | 25 | 32 | 32 |
| Water capacity | l | 40,5 | 46,5 | 46,5 | 52 | 58 | 58 | 58 |
| Recommended minimum outlet water temperature | ºC | 70 |
| Minimum return flow temperature | ºC | 50 |
| Connection of heating water / return water | - | 2 lub 6/4" |
| Noise emission level | dB | do 65 |
| Diameter of the flue pipe | mm | 156 |
| Maximum pressure | bar | 4 |
| Minimum working pressure of water | bar | 1,5 |
| Flue gas mass flow | kg/s | 0,012 | 0,014 | 0,015 | 0,016 | 0,018 | 0,019 | 0,022 |
Boiler Dimensions
The manufacturer recommends installing the boiler in combination with a buffer tank. The dimensions of the buffer tank must be determined according to the boiler power. We have to count on the maximum calculated capacity, the minimum buffer tank volume used must be 300 l.
- Loading door choke
- Slanting grate (size varies according to boiler type)
- Slanting grate (size varies according to boiler type)
- Slanting grate (size varies according to boiler type)
- Short-circuit flap
- Cover for cleaning the flue gas spigot
- Top fitting, front
- Upper rear adapter
- Tertiary air inlet nozzle
- Lower left-hand fitting with secondary air supply
- Right-hand bottom fitting with secondary air supply
- Secondary and tertiary air inlet chamber
Product specification
| Fuels | wood /logs |
| Hopper capacity | 51 dm³ |
| Power output | 30 kW |
| Weight | 472 kg |
| Exhaust gas pipe diameter | 156 mm |
| Efficiency | 89.1 - 90.3 % |
| Boiler class (303-5:2012) | 5 |
| Eco design | 5 Generation |
| Water capacity | 52 L |
| Max working pressure | 1,5 bar |
| Required chimney draught | 21 Pa |
| Outlet and inlet size | 2 lub 6/4 inch |
| Power supply | 230V / 50Hz |
| Warranty | 10 Years on cast iron body |
