Viadrus Hercules U22 D7 35 kW
 | Outdated Product This solid fuel boiler is a mid-range solution in the Hercules U22 D family manufactured by Viadrus. The total useful power of the device is 35 kW, while the claimed efficiency is at the level of 78%. The model is single-circuit, it can serve as a good solution for efficient heating of rooms up to 262 m2. As the main source of energy, wood with a moisture content of up to 20~25% is used, while the maximum fuel consumption is 11.8 kg/hour. Also note that the manufacturer provides for the possibility of switching the boiler to gas or liquid fuel. The heat exchanger is made of Czech cast iron. E-Catalog uses affiliate links compensated by our partners. |
Viadrus Hercules U22 D7 35 kW
Energy source:firewood
Mount:floor, single-circuit
Boiler power:35 kW, area ~ 262 m²
Combustion chamber:open, flue 156 mm
This solid fuel boiler is a mid-range solution in the Hercules U22 D family manufactured by Viadrus. The total useful power of the device is 35 kW, while the claimed efficiency is at the level of 78%. The model is single-circuit, it can serve as a good solution for efficient heating of rooms up to 262 m2. As the main source of energy, wood with a moisture content of up to 20~25% is used, while the maximum fuel consumption is 11.8 kg/hour. Also note that the manufacturer provides for the possibility of switching the boiler to gas or liquid fuel. The heat exchanger is made of Czech cast iron.
All specifications
Specifications Hercules U22 D7
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The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Viadrus 2026 - new arrivals, bestsellers, and the most relevant models Viadrus.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Viadrus 2026 - new arrivals, bestsellers, and the most relevant models Viadrus.
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I do not recommend buying these boilers. And in general, any others. I have a factory marriage. The boiler is assembled very poorly, the factory saves on welding. As a result, the boiler is leaking, the smoke pipe connection is located, why in the rear section, which is a water chamber. The plant refuses marriage, due to the lack of a service organization during commissioning, although the Seller did not warn about this condition when buying this boiler. It turns out that when installing a boiler in a village, I also have to look for, pay for a service organization? It is expensive, but as a result, what should be used for decades costs a bunch of leaky cast iron no Expensive. Manufacturing defects use Viadrus Hercules U22 D4 more than year |
I chose a boiler to replace an old and inefficient Soviet gas stove in a private house. Gas is now an expensive pleasure, they did heating on solid fuel and additionally installed a heat accumulator. Coal, of course, also bites in money, but firewood can be harvested without any problems, since the terrain allows it. The boiler is simple and convenient. All adjustments are mechanical, the boiler does not depend on electricity. The combustion chamber has a large loading door. You can put really big logs in there. The benefit is double: it is easier to harvest firewood and large pieces burn out more slowly. Large, solid cast iron heat exchanger. In addition, cast iron seems to be not ours, but Czech. I don’t know exactly what the difference is, but the European material will probably be of better quality. The boiler has no special requirements for the chimney. In my case, I just connected it to an existing chimney from an old gas stove and everything works fine. Fuel can burn different things. Suitable for any coal, wood and various wooden waste. The tree, by the way, does not have to be completely dry - wet logs also burn through normally, except that the heat is a little less. The tree burns out pretty quickly, in three to four hours. In winter, without a heat accumulator, it would be necessary to heat 3-4 times a day. use Viadrus Hercules U22 D6 month or more |
A good European solid fuel boiler of Czech assembly. Got it on the advice of a friend. True, he does not have Viadrus, but a modest solid-fuel domestic Cordi, but the principle of operation is the same. The boiler operates in a system with a heat accumulator with a volume of 1400 liters. You need to heat vigorously, to a high temperature of the coolant (70 - 80 degrees and above). In this mode, a full load of firewood burns out in 1.5 - 2 hours. If, however, artificially stretching the time of the firebox for passport 6 hours, then the insides of the boiler and chimney quickly become covered with sticky, viscous and smelly tar-like rubbish, which you can then remove the crap. Cast iron heat exchanger. Just a huge piece of durable and reliable cast iron. The weight of the boiler is approaching three hundred kilograms. Monumental and reliable thing. You can heat with coal, peat, firewood or special fuel briquettes. But the large 60 liter combustion chamber is best suited for a large load of firewood. Actually, I burn wood. Suitable for both natural and artificial circulation of the coolant in the heating system. The main thing is to make a system with a heat accumulator. Convenient handles on the doors of the loading chamber and ash pan. With a long and slow combustion, resinous substances are formed that pollute the boiler and chimney. The bottom door (which covers the ash pan) is very low and goes very close to the floor when opened. That is, any debris, a chip, a nail lying on the floor can jam the door. |
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Additional features boiler Viadrus Hercules U22 D7:
- The volume of the furnace is 86 L.
- Firebox depth — 624 mm
- Maximum fuel consumption — 11.8 kg/h
- Reserve fuel: brown coal, hard coal, coke