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Cyclone® MXi Modulating

Modulating burner advances the cyclone® to higher levels of efficiency.
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Cyclone® MXi Commercial Gas Water Heaters

Cyclone® MXi Commercial Gas Water Heaters
Cyclone® MXi Commercial Gas Water Heaters

Cyclone® MXi Commercial Gas Water Heaters
Cyclone® MXi Commercial Gas Water Heaters

Cyclone® MXi Commercial Gas Water Heaters
Cyclone® MXi Commercial Gas Water Heaters

Cyclone® MXi Commercial Gas Water Heaters
Cyclone® MXi Commercial Gas Water Heaters

Cyclone® MXi Commercial Gas Water Heaters
Manufacturer N/A A. O. Smith®
Type N/A Liquid Propane Gas Natural Gas
Input Power N/A 120000 BTU/hr35 kW N/A 150000 BTU/hr44 kW N/A 199900 BTU/hr58 kW N/A 250000 BTU/hr73 kW N/A 300000 BTU/hr88 kW
Thermal Efficiency N/A 95 % N/A 98 % N/A 97 % N/A 96 % N/A 96 %
Approximate Capacity N/A 60 U.S. gal227 L60 gal N/A 100 U.S. gal379 L100 gal N/A 100 U.S. gal379 L100 gal N/A 100 U.S. gal379 L100 gal N/A 119 U.S. gal451 L119 gal
Recovery at 30 ºF Temperature Rise N/A 461 gal/h N/A 594 gal/h N/A 783 gal/h N/A 970 gal/h N/A 1164 gal/h
Recovery at 17 ºC Temperature Rise N/A 1744 L/h N/A 2248 L/h N/A 2965 L/h N/A 3671 L/h N/A 4405 L/h
Recovery at 40 ºF Temperature Rise N/A 345 gal/h N/A 445 gal/h N/A 588 gal/h N/A 727 gal/h N/A 873 gal/h
Recovery at 22 ºC Temperature Rise N/A 1308 L/h N/A 1686 L/h N/A 2224 L/h N/A 2753 L/h N/A 3304 L/h
Recovery at 50 ºF Temperature Rise N/A 276 gal/h N/A 356 gal/h N/A 470 gal/h N/A 582 gal/h N/A 698 gal/h
Recovery at 28 ºC Temperature Rise N/A 1046 L/h N/A 1349 L/h N/A 1779 L/h N/A 2202 L/h N/A 2643 L/h
Recovery at 60 ºF Temperature Rise N/A 230 gal/h N/A 297 gal/h N/A 392 gal/h N/A 485 gal/h N/A 582 gal/h
Recovery at 33 ºC Temperature Rise N/A 872 L/h N/A 1124 L/h N/A 1483 L/h N/A 1835 L/h N/A 2202 L/h
Recovery at 70 ºF Temperature Rise N/A 197 gal/h N/A 255 gal/h N/A 336 gal/h N/A 416 gal/h N/A 499 gal/h
Recovery at 39 ºC Temperature Rise N/A 747 L/h N/A 964 L/h N/A 1271 L/h N/A 1573 L/h N/A 1888 L/h
Recovery at 80 ºF Temperature Rise N/A 173 gal/h N/A 223 gal/h N/A 294 gal/h N/A 364 gal/h N/A 436 gal/h
Recovery at 44 ºC Temperature Rise N/A 654 L/h N/A 843 L/h N/A 1112 L/h N/A 1377 L/h N/A 1652 L/h
Recovery at 90 ºF Temperature Rise N/A 154 gal/h N/A 198 gal/h N/A 261 gal/h N/A 323 gal/h N/A 388 gal/h
Recovery at 50 ºC Temperature Rise N/A 581 L/h N/A 749 L/h N/A 988 L/h N/A 1224 L/h N/A 1468 L/h
Recovery at 100 ºF Temperature Rise N/A 138 gal/h N/A 178 gal/h N/A 235 gal/h N/A 291 gal/h N/A 349 gal/h
Recovery at 56 ºC Temperature Rise N/A 523 L/h N/A 674 L/h N/A 890 L/h N/A 1101 L/h N/A 1321 L/h
Recovery at 110 ºF Temperature Rise N/A 126 gal/h N/A 162 gal/h N/A 214 gal/h N/A 264 gal/h N/A 317 gal/h
Recovery at 61 ºC Temperature Rise N/A 476 L/h N/A 613 L/h N/A 809 L/h N/A 1001 L/h N/A 1201 L/h
Recovery at 120 ºF Temperature Rise N/A 115 gal/h N/A 148 gal/h N/A 196 gal/h N/A 242 gal/h N/A 291 gal/h
Recovery at 67 ºC Temperature Rise N/A 436 L/h N/A 562 L/h N/A 741 L/h N/A 918 L/h N/A 1101 L/h
Recovery at 130 ºF Temperature Rise N/A 106 gal/h N/A 137 gal/h N/A 181 gal/h N/A 224 gal/h N/A 269 gal/h
Recovery at 72 ºC Temperature Rise N/A 402 L/h N/A 519 L/h N/A 684 L/h N/A 847 L/h N/A 1017 L/h
Recovery at 140 ºF Temperature Rise N/A 99 gal/h N/A 127 gal/h N/A 168 gal/h N/A 208 gal/h N/A 249 gal/h
Recovery at 78 ºC Temperature Rise N/A 374 L/h N/A 482 L/h N/A 635 L/h N/A 787 L/h N/A 944 L/h
Size of Gas Connection N/A 3/4 in. NPT N/A 3/4 in. NPT N/A 3/4 in. NPT N/A 3/4 in. NPT N/A 1-1/2 in. NPT
Schematic N/A
Schematic Drawing for Cyclone® MXi Commercial Gas Water Heaters (BTH-120(A) to BTH-250(A))
 		N/A
Schematic Drawing for Cyclone® MXi Commercial Gas Water Heaters (BTH-120(A) to BTH-250(A))
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Schematic Drawing for Cyclone® MXi Commercial Gas Water Heaters (BTH-120(A) to BTH-250(A))
 		N/A
Schematic Drawing for Cyclone® MXi Commercial Gas Water Heaters (BTH-120(A) to BTH-250(A))
 		N/A
Schematic Drawing for Cyclone® MXi Commercial Gas Water Heaters (BTH-300(A) to BTH-500(A))
Dimension A N/A 3 in7.62 cm N/A 3 in7.62 cm N/A 3 in7.62 cm N/A 3 in7.62 cm N/A 4.75 in12.07 cm
Dimension B N/A 27.75 in70.5 cm N/A 27.75 in70.5 cm N/A 27.75 in70.5 cm N/A 27.75 in70.5 cm N/A 33.12 in84.12 cm
Dimension C N/A 6.3 in16 cm N/A 6.3 in16 cm N/A 6.3 in16 cm N/A 6.3 in16 cm N/A 4.75 in12.07 cm
Dimension D N/A 35 in88.9 cm N/A 56.38 in143.2 cm N/A 56.38 in143.2 cm N/A 56.38 in143.2 cm N/A 52 in132.08 cm
Dimension E N/A 55.5 in141 cm N/A 76 in193.04 cm N/A 76 in193.04 cm N/A 76 in193.04 cm N/A 75.75 in192.41 cm
Dimension F N/A 53.5 in135.9 cm N/A 75.75 in192.4 cm N/A 75.75 in192.4 cm N/A 75.75 in192.4 cm N/A 73.75 in187.3 cm
Dimension G N/A 11.25 in28.6 cm N/A 11.25 in28.6 cm N/A 11.25 in28.6 cm N/A 11.25 in28.6 cm N/A 12.75 in32.39 cm
Dimension H N/A 42.25 in107.32 cm N/A 64 in162.6 cm N/A 64 in162.6 cm N/A 64 in162.6 cm N/A 63.13 in160.35 cm
Dimension I N/A 48.5 in123.2 cm N/A 70 in177.8 cm N/A 70 in177.8 cm N/A 70 in177.8 cm N/A 69.25 in175.9 cm
Dimension J N/A 18.25 in46.36 cm N/A 18.25 in46.36 cm N/A 18.25 in46.36 cm N/A 18.25 in46.36 cm N/A 23 in58.43 cm
Standard Shipping Weight N/A 460 lb208 kg N/A 523 lb237 kg N/A 523 lb237 kg N/A 523 lb237 kg N/A 855 lb387 kg
ASME Shipping Weight N/A 490 lb220 kg N/A 553 lb251 kg N/A 553 lb251 kg N/A 553 lb251 kg N/A 855 lb387 kg
AC Voltage N/A 120 V
Frequency N/A 60 Hz
Current N/A 5 A
Minimum Gas Supply Pressure N/A For Liquid Propane Gas: 2.12 kPaFor Natural Gas: 1.10 kPaFor Liquid Propane Gas: 8.5 inWcFor Natural Gas: 4.4 inWc N/A For Liquid Propane Gas: 2.12 kPaFor Natural Gas: 1.10 kPaFor Liquid Propane Gas: 8.5 inWcFor Natural Gas: 4.4 inWc N/A For Liquid Propane Gas: 2.12 kPaFor Natural Gas: 1.10 kPaFor Liquid Propane Gas: 8.5 inWcFor Natural Gas: 4.4 inWc N/A For Liquid Propane Gas: 2.12 kPaFor Natural Gas: 1.10 kPaFor Liquid Propane Gas: 8.5 inWcFor Natural Gas: 4.4 inWc N/A For Liquid Propane Gas: 2.12 kPaFor Natural Gas: 1.19 kPaFor Liquid Propane Gas: 8.5 inWcFor Natural Gas: 4.8 inWc
Maximum Gas Supply Pressure N/A 14 inWc3.49 kPa
Number of Installed Elbows N/A 1 2 3 4 5 6
One 90º Elbows for Maximum 3" Vent Pipe N/A 45 ft13.7 m N/A 45 ft13.7 m N/A 45 ft13.7 m N/A 45 ft13.7 m N/A
Two 90º Elbows for Maximum 3" Vent Pipe N/A 40 ft12.2 m N/A 40 ft12.2 m N/A 40 ft12.2 m N/A 40 ft12.2 m N/A
Three 90º Elbows for Maximum 3" Vent Pipe N/A 35 ft10.7 m N/A 35 ft10.7 m N/A 35 ft10.7 m N/A 35 ft10.7 m N/A
Four 90º Elbows for Maximum 3" Vent Pipe N/A 30 ft9.1 m N/A 30 ft9.1 m N/A 30 ft9.1 m N/A 30 ft9.1 m N/A
One 90º Elbows for Maximum 4" Vent Pipe N/A 115 ft35 m N/A 115 ft35 m N/A 115 ft35 m N/A 115 ft35 m N/A 65 ft19.8 m
Two 90º Elbows for Maximum 4" Vent Pipe N/A 110 ft33.5 m N/A 110 ft33.5 m N/A 110 ft33.5 m N/A 110 ft33.5 m N/A 60 ft18.2 m
Three 90º Elbows for Maximum 4" Vent Pipe N/A 105 ft32 m N/A 105 ft32 m N/A 105 ft32 m N/A 105 ft32 m N/A 55 ft16.8 m
Four 90º Elbows for Maximum 4" Vent Pipe N/A 100 ft30.5 m N/A 100 ft30.5 m N/A 100 ft30.5 m N/A 100 ft30.5 m N/A 50 ft15.2 m
Five 90º Elbows for Maximum 4" Vent Pipe N/A 95 ft29 m N/A 95 ft29 m N/A 95 ft29 m N/A 95 ft29 m N/A 45 ft13.7 m
Six 90º Elbows for Maximum 4" Vent Pipe N/A 90 ft27.4 m N/A 90 ft27.4 m N/A 90 ft27.4 m N/A 90 ft27.4 m N/A 40 ft12.2 m
One 90º Elbows for Maximum 6" Vent Pipe N/A N/A N/A N/A N/A 115 ft35 m
Two 90º Elbows for Maximum 6" Vent Pipe N/A N/A N/A N/A N/A 110 ft33.5 m
Three 90º Elbows for Maximum 6" Vent Pipe N/A N/A N/A N/A N/A 105 ft32 m
Four 90º Elbows for Maximum 6" Vent Pipe N/A N/A N/A N/A N/A 100 ft30.5 m
Five 90º Elbows for Maximum 6" Vent Pipe N/A N/A N/A N/A N/A 95 ft29 m
Six 90º Elbows for Maximum 6" Vent Pipe N/A N/A N/A N/A N/A 90 ft27.4 m
Optional Kits N/A
  • Optional Concentric Vent Kits
    • BTH-120 - 250 vent kit p/n 9006328005
    • BTH-300 - 500 vent kit p/n 9006144005
  • Optional Low Profile Termination Vent Kits
    • 3" Flush Mount Vent Kit p/n 9008933005 4" Flush Mount Vent Kit p/n 9008934005 6" Flush Mount Kit p/n 9008935005
    • Optional Condensate Neutralization Kits BTH-120-199 kit p/n 9007959005 BTH-250-500 kit p/n 9007960005
Industry Standards N/A ANSI Z-21.10.3 - CSA 4.3 ASHRAE/IESNA 90.1 ASME Certified ASME Optional NSF
Features N/A The full line of A. O. Smith Cyclone® Mxi condensing water heaters has been designed to provide years of dependable service and feature industry leading technology. Models are available from 120000 to 500000 Btu/h and all deliver thermal efficiencies of 95 % and higher. The unique helical coil heat exchanger limits weld joints for optimal service life while maximizing heat transfer.

Cyclone is the industry leader in high efficiency commercial water heating with over a quarter million Cyclone®s sold since 1996. The current Mxi modulating models adjust firing rate to the specific demand further increasing efficiency and money savings.

Intelligent Control System with Lcd Display
  • Exclusive A. O. Smith designed control system.
  • Provides detailed water heater status information.
  • Precise temperature control adjustable from 90 to 180 degrees.
  • Built-in diagnostics.
  • Run history information.
  • Cyclone water heaters are compatible with the iCOMM™ remote monitoring system.
Submerged Combustion Chamber, with Helical Heat Exchanger Coil
  • Positioned in center of tank, surrounded by water to virtually eliminate radiant heat loss from chamber.
  • Direct spark ignition.
  • Spiral heat exchanger keeps hot burner gases swirling, uses centrifugal force to maximize efficiency of heat transfer to water in tank.
  • Spiral heat exchanger reduces lime scale from forming on water-side surfaces, which maintains energy efficiency over time.
Powered Anodes Standard on All Models
  • Provides long-lasting tank protection in varying water conditions.
  • Powered anodes are non-sacrificial.
  • Automatically adjusts output needed to properly protect the tank.
Permaglas® Ultra Coat™ Glass Lining
  • Glass coating is applied using a liquid slush coating technique to ensure uniform coating.
  • Heat exchanger coil is glassed both externally and internally for optimum protection.
Mechanical Venting Versatility
  • Conventional power venting or direct venting.
  • Vents vertically or through a sidewall.
  • Front located exhaust and condensate connections allow for easy install and access.
  • Vents with low cost PVC Schedule 40 intake and exhaust pipe. Approved for optional CPVC Schedule 40, Polypropylene and AL29-4C stainless steel vent materials.
  • Direct-vent intake and exhaust pipe can terminate separately outside building or through single opening, using concentric vent assembly.
  • Canadian installations require ULC S636 PVC/CPVC, ULC S636 Polypropylene and AL29-4C stainless steel pipe for intake and exhaust.
High Efficiency Modulating Pre-Mix Powered Burner
  • Down-fired pre-mix burner provides optimum efficiency and quiet operation.
  • Top-mounted burner position prevents condensation from affecting burner operation.
Space-Saving Design for Installation Flexibility
  • Reduced footprint, ease of service, protection from water damage in case of flooding.
  • Easy-to-remove top cover for convenient access to serviceable parts.
  • 0" installation clearances on sides and rear, 1-1/2" installation clearance on top.
  • Handhole cleanout allows easy access to tank interior for cleaning.
  • 0" clearance to combustibles, approved for installation on combustible floors.
Testing and Certifications N/A Codes and Standards
  • CSA® certified and ASME rated T&P relief valve
  • Maximum hydrostatic working pressure: 160 PSI
  • All models are design certified by Underwriters Laboratories (UL), Inc., to ANSI Z21.10.3 - CSA® 4.3 Standards
  • Meets the thermal efficiency and standby loss requirements of the U.S. Department of Energy and current edition ASHRAE/IESNA 90.1
  • Design-certified by Underwriters Laboratories to NSF standard 5 for 180 ºF (62 ºC) water
  • Complies with SCAQMD Rule 1146.2 and other Air Quality Management Districts with similar requirements for low-NOx emissions
  • ASME tank construction optional on 120-500 model sizes
Warranty N/A
  • 3-Year Limited Warranty.
  • Optional 5-Year Extended Tank Warranty.
Note N/A Recovery capacities are based on AHRI rated thermal efficiencies.