The Unimat UT-HZ hot water boiler is a shell boiler in 3-pass design with two completely separate flame tubes and flue gas passages. This double-flame tube/smoke tube boiler has been in use for decades and is built with separate flue gas passages. This means it is suitable for operation with just one burner.

The UNIMAT UT-HZ hot water boiler is deployed in all areas where very large amounts of heat are required. The main areas of use are district heating generation and the processing industry.

Type UT-HZ
Heat transfer medium High-pressure hot water
Design 3-pass-2-flame tube/smoke tube technology
Capacity in kg/hour 13 000 to 38 000
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