5B Series

The Series 5B boiler offers the capacities and features that make it ideal for commercial, institutional, and multi-family heating applications, where the simplicity of an atmospheric design is desired. The rear outlet drafthood is specifically designed for installation involving low ceiling heights. Shipped as a knocked-down unit, the Series 5B allows for maximum maneuverability into the boiler room. The boiler is also available with factory-assembled sections.



Fuel Natural or LP Gas
Thermal Efficiency 77%
Fuel Input 401-1,950 MBH
Venting Atmospheric
Water or Steam Steam Only
Domestic Water Coil No
Heat Exchanger Cast Iron
Condensing No
Burners Stainless Steel Tubes
Shipping Options Knockdown or Assembled Sections
Warranty 10-Year*

*In the interest of continual improvements in products and performance, Burnham Commercial reserves the right to change specifications without notice. A complete copy of the boiler warranty, including details and limitations, can be found on our website www.burnhamcommercial.com.


  • Natural or LP Gas
  • Steam
  • 401 to 1,950 MBH Input
  • Atmospheric Draft
  • Cast Iron Sectional Design
  • Knockdown or Assembled Sections

Low Drafthood
The Series 5B boiler was specifically designed to use a low-profile drafthood, so it will fit easily into basements and boiler rooms that have low ceilings.

Three Firing Sequences
Because the Series 5B uses controls that are commonly available in most HVAC and plumbing warehouses, it is easier to service and maintain than the more sophisticated forced-draft type boilers. However, the Series 5B is available with optional Low-High-Off, Low-High-Low, and Modulating firing sequences, for those applications where efficiency and advanced control capability are required.

Domestic hot water requirements are easy to meet with the optional tankless heater, which can be installed in one or both ends of the section assembly. Common available controls make the Series 5B easy to maintain and service. Gas Controls meeting full requirements of ANSI Z21.13 ensure that the Series 5B meets stringent safety standards, and the low-profile drafthood is ideal for low-ceiling applications.

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