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The SG Pro Boiler has been replaced by Saint Roch Universal Boiler.

The BIASI SG Pro system is a European, three-pass, reverse flame path boiler design. This causes more complete combustion of the fuel increasing AFUE efficiency up to 86.9% while reducing NOX emissions. This BIASI boiler is a “mid-mass” boiler more suitable for radiant or radiator hydronic systems.. The SG Pro is constructed from GG20 cast-iron and is ASME rated to operate at 58 PSI and comes with a lifetime warranty. The SG Pro also complies with all international standards. Each SG Pro is assembled with a front hinge door that allows easy access for maintenance.


  • Outputs from 109,000 BTU to 257,000 BTU
  • Up to 86.9% efficiency
  • GG 20 corrosion resistant cast-iron
  • 58 psi cast-iron construction
  • Easy-access swing door
  • Reverse flame path for “low nox” emissions
  • Super efficient, 3-pass flame path/heat exchanger
  • Extra heavy insulation for low jacket & standby losses
  • ASME listed
  • Control panel burner switch, linear temperature and pressure gauge


  • Limited Lifetime on the boiler block to the original purchaser



SG Pro Manual


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