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JP Trading Inc.>Commercial Water Heater>Raypak RAYTHERM® Low NOx Water Heater, 181- 401

Raypak RAYTHERM® Low NOx Water Heater, 181- 401


Model: 181- 401

Raypak's family of Raytherm Low NOx Water Heaters, 181-401, feature 82% efficiency, rugged all brass headers, corrosion resistant steel, and 24-volt controls.

Category: Commercial Water Heaters

Rated 4.8/5 based on 24 customer reviews

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Model Number Full Input in
 Flue Dia.
WH-181 181,000  6″
WH-261 264,000  7″
WH-331 334,000  8″
WH-401 399,000*  9″

*WH3-401 (2-Stage) has input 375,000BTUH.

Available Firing Modes

WH1 On-off
WH3 2-Stage


  • Rugged All-Brass Headers
    Resists corrosion, easily removed for inspection or service. AB 1953 compliant.  Glass-lined cast-iron headers and cupro-nickel tubes are available as options.
  • Finned Copper Tube Heat Exchanger 
    Single bank, straight through design delivers lowest pressure drop. Integral fins have ten times the heat transfer surface of plain tubes.
  • 82% Efficiency.  Cat I Venting.
  • Indoor/Outdoor Certified.
  • NOx emissions under 55 PPM (40ng/j). Consult local emissions requirements prior to ordering. 
  • Corrosion Resistant Steel
    Fittings are brush galvanized against rust. Heat shields are corrosion-resistant steel. Jacket has Polytuf powder coat finish.
  • 24-Volt Controls
    Totally enclosed for protection. Door is easily removed for inspection and service.
  • Floating Return Header
    Immunizes heat exchanger from thermal shock.
  • Tube Sheet and “O” Ring Construction
    Eliminates repair and maintenance problems associated with rolling tubes directly into a casting.
  • Interlocking Refractory Panels
    Sealed corners, reduces radiation loss.
  • Stainless Steel Burners
    Maintains precise combustion at all firing rates, burns quietly, won’t clog or corrode.
  • Slide-Out Burner Tray
    Allows easy inspection and service.
  • Spark-to-Pilot Ignition
    Most dependable ignition method available.
  • Available for Natural Gas Only.