Boiler Viadrus U28 Hercules

The boiler Viadrus Hercules U28 is a low-temperature hot water solid fuel fired boiler. The construction of the boiler U28 was designed to burn coke, coal, wood and lignite.

Central heating boiler Hercules U28 may be used for heating family houses, shops, workshops, schools, churches etc. The boiler is designed to operate in central heating systems with natural and forced heating water circulation with a working pressure up to 0.4 MPa. Viadrus U28 boiler has in his basic equipment a mechanical air draught regulator and accessories for maintenance and cleaning of the boiler.

Boiler U28 is a boiler with lower combustion system, in which the combustion zone is limited to the space between the fire grate and the bottom edge of the filling shaft, the height remains unchanged from the heating absorption surface in contrast to the classical way of combustion. Cast-iron solid fuel boiler U28 has a very long life compared to those who base on steel. The lifetime of Viadrus Hercules U28 is estimated to be 20 years or more if proper fuel is used and maintained as the manufacturer specifies (especially the return water temperature). Another advantage of the boiler is the possibility to change the loading door opening direction from left to right and vice versa.

Technical drawing of VIADRUS HERCULES U28 cast iron boiler

1. front segment
2. middle segment
3. average segment member without a bottom rail
4. rear segment
5. loading door (with primary air rosette)
6. top cover of the convection channel
7. bottom cover the bottom convection channel
8. inclined fire grate
9. ash pan doors (with secondary air regulated flap)
10. flue
11. third air supply
12. boiler casing (complete)
13. thermomanometer
14. mechanical air draft regulator
15. return water connector (inlet)
16. water blowdown
17. water supply connector (outlet)
18. double safety valve DBV 1 - 02
19. safety valve
20. small ash pan with a sliding cover (third air supply)
21. ashpit
22. flue flap draft control of the back segment
23. combustion area flap