Raytherm® Low NOx Water Heaters, 181-401

BASIC DATA
Model Number Full Input in
(BTUH)
 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

Features:
  • 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.
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Specifications

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