HoSt supplies cylindrical flame tube boilers. In this type of boiler the shell is filled with water and the flue gasses flow through the flame tubes.

For improved cleaning, the first part of the boiler is equipped with a radiation section where the flue gasses are being cooled before they flow though the flame tubes. The cooling in the radiation section prevents harsh and hard to remove ash depositions in the flame tubes. In addition, for regular cleaning the cylindrical boilers can be equipped with compressed air soot blowers to minimise the number of production stops.

Advantages of HoSt cylindrical flame tube boilers






Horizontal cylindrical hot water boilers

Horizontal cylindrical boilers are cheaper. However, their disadvantage is that more production time is lost for the stops required for cleaning..

Vertical cylindrical hot water boilers

In the vertical hot water boilers the flue gasses initially flow downwards through a radiation section. The flue gasses are reversed into vertical pipes when they reach the bottom of the boiler. Due to the vertical orientation

the soot blowers clean the pipes more efficiently. In this configuration the soot always falls vertically, in the flow direction or the opposite direction, and is unable to deposit again which is a frequent issue with horizontal flame tube boilers.

Cylindrical steam boilers

Horizontal cylindrical boilers are often used for steam production up to 32 bar as a cost saving measure. The flue gasses are first cooled in the radiation cooler before they enter the flame tubes. At pressures up to 20 bar the

radiation cooler is integrated in the boiler, however for pressures in excess of 20 bar another radiation cooler, a larger room of membrane walls, is installed before the boiler inlet.


Interested in what we can offer? Or interested in visiting one of our projects? For example the wood-fired bioenergy plant in Beetgum, the bio-CHP in Strijp or in Meerhoven? Or do you need more information about our biomass boilers and waste boilers? Contact us. We would be glad to assist you and help you in making the best choice.

  • This field is for validation purposes and should be left unchanged.