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Commercial Gas Water Heaters
AOSCG10500
Revised September 2008
PG 1 OF 4
MasterFit
®
Low Nox Commercial Gas Tank-Type
Water Heaters
APPROVAL RATINGS AND CERTIFICATION
All models comply with ANSI Z21.10.3 CSA4.3
All models comply with ASHRAE/IES 90.1-2004
C.E.C. California Energy Commission
All models comply with Texas and So. California
SCAQMD Rule 1146.2
FEATURES
Eighty plus percentage thermal effi ciency affords lower operating costs on
most models.
INDUCED DRAFT BUILT-IN BLOWER
- The blower is built into the top cover, factory
mounted and wired. Ideal for installations where negative pressure is present in the building.
Blower proves draft prior to ignition. No drafthood or barometric damper required.
METAL VENTING - Rated Category I Appliance. Uses standard metal single wall or double
wall type “B” vent. Can be commonly vented with other Category I appliances. Vent connects
directly to the blower outlet. Perfect choice for retrofi t and upgrade installations.
WATER CONNECTIONS - For ease of installation, all BTNs feature water connections on the
top, front, and rear.
GLASS LINED TANK - Permaglas® Ultracoat is the proprietary ceramic coating developed
by A. O. Smith’s ceramic engineers specifi cally for the heater. It is applied after the complete
tank has been assembled to give a seamless barrier against hot water corrosion. The maximum
working pressure is 160 psi.
INSTALLED COST SAVINGS - When multiple BTN units are exclusively used in a vent
manifold, use the National Flue Gas Code Table 11 Fan Sizing Charts to determine vent
diameter and specifi cations. The BTN with its internal induced draft blower enables safe use of
smaller vent diameters. This feature can save hundreds of dollars in installation costs.
FULLY AUTOMATIC DIGITAL CONTROLS WITH SAFETY SHUTOFF - Accurate,
dependable control system. Manual reset gas shutoff device for added safety. Maximum inlet
gas pressure is 14” W.C. Minimum gas pressure is 5.0” W.C. Natural Gas, 11” W.C. Propane.
FOAM INSULATION - Saves fuel, helps reduce standby heat loss.
JACKET- Heavy gauge steel fi nished with a baked enamel fi nish over a bonderized undercoat.
EASY CLEANING - Handhole cleanout allows access for easy cleaning.
FULLY TESTED FOR SAFETY AND PERFORMANCE - Design certifi ed by the
Underwriters Laboratory for 180°F hot water service. Meets rigid requirements of the National
Sanitation Foundation when equipped with optional leg kit. Certifi ed for use on combustible
fl ooring.
INTERMITTENT IGNITION DEVICE - Eliminates standing pilot. Provides fl ame failure
response in less than one second. Power ON/OFF switch.
EASY TO INSTALL - Completely factory-assembled. Only gas, water, vent and electric
connections need be made. Provided with drain valve.
ANODES - CoreGuard™ long-life, stainless steel core anode rods.
PLUG KITS - Pipe nipples and caps are included to plug unused water connections.
MODELS
BTN
120-400(A)
on selected models.
Approved to NSF Standard 5
with option leg kit.
202515_AOSCG10500.indd 1202515_AOSCG10500.indd 1 9/26/08 8:44:30 AM9/26/08 8:44:30 AM