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XFyre® Hydronic Boilers, 300A-850A


Model Full Input in BTUH Flue Dia.
H7-300A  300,000 4″
H7-400A  399,000  4″
H7-500A  500,000  4″
H7-700A  700,000  6″
H7-850A  850,000  6″


  • Efficiency up to 94%  Condensing, Cat IV venting required.
  • All models CSA indoor/outdoor certified.
  • Small footprint, less than 9-1/2 square feet.
  • Top side water connections – allows side by side installation.
  • All models are equipped with 316L welded stainless steel heat exchanger and copper plumbing. ASME Section IV constructed and stamped. National Board Registered AB 1953 low lead compliant.
  • Multiple pump outputs – Boiler Pump, System Pump, Indirect Pump.
  • Dual flame sensing – Flame sensor and spark ignition rod.
  • Electronic modulating gas valve and burner, up to 5:1 turndown.
  • Certified under SCAQMD Rule 1146.2.  Meets all Low NOx regulations.
  • Supports inlet water temperature down to 50F.
  • Whisper quiet operation.
  • On-board diagnostic center, English, no codes.
  • 0-10 VDC BMS Interface (setpoint or direct drive).
  • Built-in cascade function for up to 4 boilers.
  • VERSA IC® control package with built-in outdoor reset function.
  • Complete cabinet protects all controls and wiring.
  • Tough rust-resistant powder coat finish.
  • Easy to service – removable air filter.
  • Certified for PVC, CPVC, Polypropylene or stainless vent materials.
  • Suitable for altitudes up to 10,000 ft. (derate may apply).
  • Available for natural gas or propane.


  • Outdoor air sensor (B-32).
  • Indirect sensor.
  • TruSeal® direct vent kit (D-21 factory installed, D-22 Loose).
  • Condensate neutralizer (Z-12).