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The Biasi B-40 Boiler has been replaced by Saint Roch Optimajor Boiler.

You owe it to yourself to warm up to our BIASI boiler systems. Our economical and highly efficient 3-pass design offers the flexibility of using either an oil or gas burner. Our unique GG20 cast-iron block, with its 58 PSI rating and easy-access swing door, is unsurpassed in durability and efficiency, providing years of trouble-free operation. There are 7 models ranging from 265 to 658 MBH, which are well-suited for commercial or multi-unit buildings. We have tested our systems extensively to Hydronics Institute Standards. BIASI’s foundry is ASME certified.


  • Outputs from 230,000 to 684,000 BTU/HR
  • Gas or Oil compatible
  • Mid-Mass Commercial Boiler
  • Efficient 3-pass heat exchanger boiler design
  • GG20 cast-iron construction for superior heat retention and durability
  • ASME and ULC listed


  • 20 Year Limited Warranty on the boiler block to the original purchaser


B-40 Literature



B-40 Manual


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