The Unimat UT-H is a shell boiler with one flame tube, built in a 3-pass design. Flue gases flow through the flame tube and smoke tubes on the inside and boiler water flows around them on the outside. The flame tube, internal water-flushed rear flue gas reversing chamber, first smoke tube and second smoke tube are all arranged for optimum flow within the cylindrical pressure vessel.

The main areas of use of the UT-H hot water boiler are local and district heating generation, all sectors of business, the processing industry, heat suppliers and public facilities. These boilers are also used as base load, peak load and reserve heating boilers at district heating plants.

Type UT-H
Heat transfer medium High-pressure hot water
Design 3-pass single-flame tube/smoke tube technology
Capacity in kg/hour 820 to 18 300
Safety design overpressure (in bar) up to 30
Max temperature in °C up to 240
Fuel Oil, gas

  • Intuitive boiler control on SPC basis with very high transparency of operating data
  • High level of efficiency due to 3-pass technology, an integrated flue gas heat exchanger and effective heat insulation materials
  • Up to 93 % boiler efficiency without, up to 96 % boiler efficiency with flue gas heat exchanger and up to 105 % with condensing heat exchanger
  • Suitable for all burner systems
  • Pollutant reduced combustion thanks to the use of highly developed firing systems and careful matching of the best boiler and burner combination
  • Easy for maintenance – conveniently accessible on both the flue gas side as well as the water side
  • Robust, reliable and unsurpassed in its durability 
  • Acceptance in accordance with the European Pressure Equipment Directive - applied almost worldwide
  • Simple extension options thanks to integrated module technology 
  • Smoke tube passes free of flow components
  • High permissible temperature spread of up to 40 °C
  • The boiler can be equipped with a separate fourth pass for waste heat use
  • The boiler body can also be used as a pure waste heat boiler behind combined heat and power plants or gas turbines

UNIMAT Hot Water Boiler UT-H