Raytherm Hydronic Boilers, 2100-4001

Raypak's family of Raytherm Hydronic Boilers, 2100-4001, feature corrosion-resistant steel, cast-iron headers with copper finned tube heat exchangers, and stainless steel burners.

Raytherm Hydronic Boilers, 2100-4001


Model Number Full Input in BTUH
Flue Dia.
H-2100  2,100,000  24"  81% Thermal
 2,499,000  26"
H-3001  3,000,000  28"   82% Combustion
 3,500,000  30"
H-4001  4,000,000  32"

Available Firing Modes

H3 2-Stage
 H4 On-off
 H9 4-Stage


  • Indoor Only.
  • Cat I venting.
  • Cast-Iron Headers with Copper Finned Tube Heat Exchanger
    AB 1953 compliant, single-bank, straight-through design delivers lowest pressure drop. Integral fins have ten times the heat transfer surface of plain tubes.
  • Corrosion-Resistant Steel
    Fittings are brush-galvanized against rust. Heat shields are corrosion-resistant steel. Jacket has Polytuf powder coat finish.
  • 24-Volt Controls
    Are totally enclosed for protection. Door is easily removed for inspection and service.
  • Floating Return Header
    Protects heat exchanger from thermal shock.
  • Tube Sheet and “O” Ring Construction
    Eliminates the repair and maintenance problems associated with rolling tubes directly into a casting.
  • Interlocking Refractory Panels
    Sealed corners reduce radiation loss.
  • Stainless Steel Burners
    Maintain precise combustion at all firing rates, burns quietly and won’t clog or corrode.
  • Slide-Out Burner Tray
    Allows easy inspection and service.
  • Spark-to-Pilot Ignition
    The most dependable ignition method available.
  • Available for Natural Gas or Propane.

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