96% Thermal efficiency versatile power direct vent.

The Cyclone® Xi™ is a light-duty, power direct vent, fully condensing commercial gas water heater with an internal helical heat exchanger. This helical heat exchanger helps Cyclone® Xi™ achieve 96% thermal efficiency and deliver outstanding hot water output.
Unit of Measure



N/A A. O. Smith®

Input Power

N/A 100000 BTU/hr


N/A 50 gal189 L


N/A Liquid Propane Gas Natural Gas

Shipping Weight

N/A 255 lb116 kg

Maximum Hydrostatic Working Pressure

N/A 150 psi

Male Inlet and Outlet Connections

N/A 3/4 in

Female Circulation Loop Connections

N/A 3/4 in

Gas Inlet

N/A 1/2 in

Minimum Supply Pressure for Natural Gas

N/A 3.50 inWc0.87 kPa

Minimum Supply Pressure for Liquid Propane Gas

N/A 8 inWc1.99 kPa

Maximum Gas Supply Pressure

N/A 14 inWc3.48 kPa

Industry Standards

N/A ANSI Z-21.10.3 - CSA 4.3 ASHRAE/IESNA 90.1 UL® Listed

Maximum Recovery (ºF)

Recovery at 40 ºF Temperature Rise

N/A 291 gal/h

Recovery at 100 ºF Temperature Rise

N/A 116 gal/h

Recovery at 140 ºF Temperature Rise

N/A 83 gal/h

Maximum Recovery (ºC)

Recovery at 22 ºC Temperature Rise

N/A 1102 L/h

Recovery at 56 ºC Degree Rise

N/A 439 L/h

Recovery at 78 ºC Temperature Rise

N/A 314 L/h



Schematic Drawing for Cyclone® Xi™ Commercial Water Heaters

Dimension A

N/A 66-3/4 in169.5 cm

Dimension B

N/A 49-1/4 in125.1 cm

Diameter C

N/A 22 in55.9 cm

Dimension E

N/A 3 in7.6 cm

Dimension D

N/A 15-3/4 in40 cm

Dimension F

N/A 8 in20.3 cm

Electrical Characteristics


N/A 120 V


N/A 60 Hz


N/A <5 A



N/A Energy Star® Qualified

Helical Internal Heat Exchanger
  • Completely surrounded by water in tank, provides much greater heat transfer surface than standard straight flue tube.
  • Operates at 96% thermal efficiency, which saves money on operating costs, increases hot water output compared to standard efficiency water heaters.
  • Minimizes standby losses by trapping heat in the tank.
  • Spiral heat exchanger reduces the accumulation of lime scale, to help maintain higher efficiency performance over time.
Versatile Power Direct Vent Design
  • Uses inexpensive PVC, CPVC, ABS or polypropylene pipe. Canadian installations require ULC S636 approved PVC or CPVC pipe for venting. Can be vented vertically thru-the-roof or horizontally thru-the-wall.
    • 2" pipe, vents up to 45 equivalent feet.
    • 3" pipe, vents up to 128 equivalent feet.
  • Optional concentric vent and sidewall termination kits available.
Condensing Design
  • 96% efficient condensing design.
  • Equipped with condensate drain tee.
Side-Mounted Hot and Cold Recirculating Taps
  • Allows Cyclone® Xi™ to be installed as part of combination space heating/water heating applications.
  • Plugs for the recirculating taps are factory installed.
Advanced Electronic Control
  • Large LCD display.
  • Precise temperature control.
  • Advanced diagnostics.
  • iCOMM™ Compatible and can be monitored from remote locations.
Permaglas® Ultra Coat™ Glass Lining
  • A.O. Smith® exclusive process provides superior protection against corrosion.
  • Protects all interior tank surfaces including inside and outside of the helical heat exchanger.
Heavy-Duty Anodic Protection
  • Provides even more protection against corrosion.
Available In Natural Gas and Propane

Top-Fired Low NOx Green Choice® Gas Burner
  • Complies with California SCAQMD Rule 1146.2 and other Air Quality Management Districts with similar NOx emission requirements of 14 ng/j or 20 ppm.

Testing and Certifications

Testing and Certifications

  • CSA® Certified and ASME Rated T&P Relief Valve
Codes and Standards
  • Design-certified by CSA® International according to ANSI Z21.10.3-CSA® 4.3 standards
  • These models meet the thermal efficiency and standby loss requirements of the U.S. Department of Energy and current edition of ASHRAE/IESNA 90.1
  • Approved for Canada



  • 3-Year Limited Tank Warranty / 1-Year Parts Warranty.



N/A Available in Propane (LP) Gas.

Minimum pressure must be maintained under both load and no load (dynamic and static) conditions.