Bosch Model Buderus SB745WS Condensing Boiler

NEW for 2013! With this boiler, project costs are reduced due to simplified piping.

With inputs ranging from 3003 to 5443 MBH, the Buderus SB745WS Series has an increased maximum operating pressure to 80 psi, and a 10 year non-prorated limited warranty. A full three-pass flue design extracts latent heat and maximizes overall efficiency.

Advantages at a Glance

  • Ultra high efficiency - up to 98%
  • Multi-fuel options available: NG, LP, ultra low sulfur oil and heating oil type 2
  • Pressure rating up to 80 psi
  • Full-swing openings of the main combustion chamber and fire tube heating surface assure easy inspection and service


  • No restriction on return temperature and flow rates
  • High mass design for new construction and retrofit applications
  • Titanium infused stainless steel fire tubes for long life
  • Dual Returns provide unique design opportunities
  • 2,738 to 5,293 MBH output
  • Top water connections for easy access and serviceability


Download Brochure Get Quote
boiler service

Quote Request

Our complete line of boiler room equipment includes a wide range of boilers, burners, hot water heaters, feedwater systems, blowdown systems, fuel efficient equipment, control systems, oil heaters and stack systems.

Quote Request


The Buderus SB Series condensing boilers by Bosch are designed to reach up to 98% efficiency using stainless steel on all three flue passes of the heat exchanger.

  • High water volume and robust boiler design
  • No restrictions with respect to return water temperature, water flow or temperature rise through the boiler
  • Dual return connections for further efficiency gains
  • Perfect for any new or retrofit application