Wood Boiler 5 Generation 2020

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.

1. Loading door choke
2. Slanting grate (size varies according to boiler type)
3. Slanting grate (size varies according to boiler type)
4. Slanting grate (size varies according to boiler type)
5. Short-circuit flap
6. Cover for cleaning the flue gas spigot
7. Top fitting, front
8. Upper rear adapter
9. Tertiary air inlet nozzle
10. Lower left-hand fitting with secondary air supply
11. Right-hand bottom fitting with secondary air supply
12. 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