Universal steam boiler UL-S, UL-SX
The UL-S is a highly efficient steam boiler with a three-pass design for 1,250 to 28,000 kg/h of steam at up to 30 bar. With impressively low emissions and its ability to be converted for biofuels or hydrogen, the UL-S is designed to be future-proof.
- Very high efficiency for all output ratings from 1,250 to 28,000 kg/h for low running costs and emissions
- Complete system with customer-specific equipment and future-proof technology
- Extremely well proven design “Made in Germany”, highly durable and easy to maintain
- Consistent steam quality for reliable supply
- Custom designs available for heat recovery boilers, hybrid or superheated steam
- Smart boiler control and seamless system integration with digital assistants
Thanks to the integrated economiser, the UL-S uses the energy supplied even more efficiently, saving up to 7% on fuel. An optional condensing heat exchanger can also recover almost all of the waste heat and reduce the flue gas temperature to up to 50 °C. Very low emissions (to below 50 mg NOx) are possible thanks to the large furnace.
The UL-S is individually configured for your application, and manufactured and equipped for easy planning and quick installation. The boiler and burner technology work effectively together, even when using multi-fuel firing systems. The technology can be retrofitted to run on climate-neutral fuels such as biogas, bio-oil or hydrogen at any time.
The Bosch UL-S boiler design with asymmetrical arrangement of flame and smoke tubes results in natural water circulation for rapid heating and a dynamic response. The German-made construction has proven itself thousands of times and is particularly durable and easy to maintain thanks to its excellent accessibility.
Thanks to the high steam chamber and three-component control, the UL-S offers excellent pressure consistency and steam quality, even when the steam demand fluctuates significantly. This optimises boiler operation and ensures reliable availability of the process heat. The Bosch system is particularly well suited to the food and manufacturing industries.
Bosch also offers the UL-S as a heat recovery boiler with firing and fourth pass for the proportional use of waste heat or as a pure heat recovery boiler. Another option is a hybrid boiler with an electrical heater rod for green electricity. The UL-SX can be fitted with a superheater module for use as a superheated steam boiler for steam turbines, as an example.
The Bosch BCO boiler control system lets you easily control the UL-S using a touch display. The boiler system is compatible with all the usual process control systems. The optional efficiency assistant and protected remote access facility allow seamless Industry 4.0 integration. All control systems come pre-configured, fully wired and tested.
Technical Details and Documents
Heat transfer medium
High-pressure saturated steam
Three-pass single-flame tube/smoke tube technology
1,250 to 28,000 kg/h
up to 30 bar
up to 235 °C
Gas, oil, bio gas, bio oil, hydrogen
Steam boilers brochure