Fire Tube Hot water boilers

UNIMAT Hot Water Boiler UT-M

Our proven UNIMAT 3-pass design has been used for decades – with overwhelming success. The UT-M is offered in various sizes and can also be used in a pooled-output multi-boiler system. It is CE certified and is designed and equipped in compliance with the European Pressure Equipment Directive.

The UT-M's exceptional performance is most evident in central heating systems for local and community heating. But this versatile hot water boiler is also used in a wide variety of commercial and industrial heating applications.

You can find further information in our hot water boiler brochure. (PDF 0.1 MB)

The UT-M hot water boiler is supplied as a fully operational unit including equipment. This high-quality equipment includes the boiler pressure vessel, burner unit, flue gas or condensing heat exchanger, and the control and safety technology, which comes ready-connected to the integrated terminal box.

Basic equipment

A variety of equipment options to suit customer requirements

Associated boiler house components:

WTM water treatment module
ECO 1/7 flue gas heat exchanger
ECO 6 flue gas heat exchanger for utilisation of condensing technology
SP/RP supply/return flow adapter piece
RTS return flow temperature safeguard
GRM gas regulation module
OCM oil circulation module
OSM oil supply module
SCO system control

More information about the

Associated boiler house components

Efficient 3-pass design
Standard efficiency without flue gas heat exchanger up to 95% and up to 105% with condensing heat exchanger
Effective thermal insulating materials with a high degree of efficiency
Approved for low return flow temperatures from 50 °C
Suitable for all burner systems
Pollutant reduced combustion thanks to the use of highly developed firing systems and careful selection of the best boiler and burner combination
Easy maintenance thanks to fully hinged boiler front door
Robust, reliable and unsurpassed in its durability
No minimum burner load level for water removal on the flue gas side
Smoke tube passes free of flow components
High permissible temperature spread of up to 50 K

Type	UNIMAT UT-M
Heat transfer medium	High-pressure hot water
Design	Three-pass single-flame tube/smoke tube technology
Output	750 to 19,200 kW
Safety pressure	up to 16 bar
Max. temperature	to 190 °C
Fuel	Oil, gas

The continuous flame tube ends in an inner water-flushed flue gas reversing chamber, which leads into the first smoke tube. Both the first and second smoke tubes are free from flow fittings. The highly functional round design ensures optimal pressure resilience. Furnace, water chamber volume and radiant and convective heating surfaces are perfectly dimensioned and matched to one another.

The boiler front door is fully hinged, with hinges on the right or left as desired. The entire cross section of the boiler is freely accessible. This makes maintenance, cleaning and inspection simple. The high quality mineral wool matting insulation covering the entire boiler body and the special thermally insulating materials in the front door keep radiant heat loss at negligible levels. If desired the heat source can be supplied ex works with an integrated flue gas or condensing heat exchanger.

Certification according to the European Pressure Equipment Directive means that high operating and safety temperature levels of up to 190 °C are possible.