Bosch Model Buderus SB625WS Condensing Boiler

NEW for 2013! This high-efficiency condensing boiler features design flexibility for retrofit and new construction projects.

With inputs ranging from 563 to 2200 MBH, the Buderus SB625WS 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


  • High mass design for new construction and retrofit applications
  • Titanium infused stainless steel fire tubes for long life
  • Dual returns provide unique design opportunities
  • No restriction on return temperature and flow rates
  • 544 to 2,190 MBH Output
  • Top water connections for easy access and serviceability


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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.

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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