A.O. Smith BTH-120 through BTH-500 Specifications

ACGSS02407

UP TO 96% THERMAL EFFICIENCY,DIRECT VENT

The A.O. Smith Cyclone Xi family of products represents the industry’s most technologically

advanced commercial water heaters. The innovative Cyclone Xi design takes performance to

its highest level with efficiencies of 95% and 96%. Models are available from 120,000 BTUs

and now up to 500,000 BTUs. In addition, the Cyclone Xi features an Intelligent Control

System making it the smartest water heater in the industry. 

Cyclone Xi provides outstanding hot water output, with dramatic savings on operating costs

compared to units with standard 80% efficiency. A.O. Smith’s leading-edge engineering

delivers conventional power-vent or sealed combustion power direct-vent versatility, low NOx

emissions and excellent space-saving characteristics. Powered anodes, standard on all

Cyclone Xi models, provide superior tank protection for years of trouble free operation. 

INTELLIGENT CONTROL SYSTEM WITH LCD DISPLAY

• Exclusive A.O. Smith designed control

• Provides detailed water heater status information

• Precise temperature control

• Built-in diagnostics

• Run histrory information

SUBMERGED COMBUSTION CHAMBER, 

WITH HELICAL HEAT EXCHANGER COIL

• Positioned in center of tank, surrounded by water to virtually 

eliminate radiant heat loss from chamber

• Spiral heat exchanger keeps hot burner gases swirling, uses centrifugal

force to maximize efficiency of heat transfer to water in tank

• Spiral heat exchanger prevents scale and sediment from forming on 

water-side surface, which can reduce energy efficiency over time

POWERED ANODES STANDARD ON ALL MODELS

• Provides long-lasting tank protection in varying water conditions

• Does not require maintenance or inspection

PERMAGLAS

®

ULTRA COAT

™

GLASS LINING

• Exclusive process provides superior protection against corrosion

• Both sides of heat exchanger coil are lined for protection against flue gas 

condensate inside coil

MECHANICAL VENTING VERSATILITY

• Conventional power-venting or sealed combustion direct venting

• Vents vertically or through sidewall

• Direct-vent intake and exhaust pipe can terminate separately outside building, 

or through single opening, using concentric vent assembly

• Uses inexpensive PVC, CPVC or ABS pipe for intake and exhaust

HIGH EFFICIENCY 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

BTH-120

through

BTH-500

Approved, 

Rule 1146.2 Low NOx for

California and Texas

BTH-120-250

BTH-300-500

July 2007R

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December 2007R

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