Commercial Gas Water Heaters
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
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.
- The blower is built into the top cover, factory
MODELS
BTN
120-400(A)
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.
Revised September 2008
Approved to NSF Standard 5
with option leg kit.
on selected models.
AOSCG10500
PG 1 OF 4
Commercial Gas Water Heaters
OTHER FEATURES
• Equipped with gas pressure regulator and pilot fi lter • Integral automatic gas shutoff system prevents excessive water temperature •
A.G.A. rated temperature and pressure relief valve factory-installed • Maximum working pressure is 160 psi standard • Cathodic protection
• Adjustable thermostat with a 120-180°F range.
• THREE YEAR LIMITED TANK WARRANTY – For complete warranty information, consult written warranty or contact A. O. Smith.
OPTIONS
• Manifold kits for multiple heater installations.
• Meets NSF Standard 5 with optional leg kit.
BTN DIA-SCAN™ CONTROLS
The A.O. Smith BTN models feature true self diagnostic controls in a digital solid state design. These advanced control aid in both the
installation and maintenance of the BTN water heater. The White Rogers Silicon Nitride Hot Surface Ignitor ensures rugged reliability and
years of trouble free operation.
Digital Temperature Control
Solid State Ignition Control
Solid State Temperature Probe
Silicon Nitride Hot Surface Ignitor
Digital Temperature Control
• Accuracy to within ± 2°F
• Power On/Standby Indicator
• ECO Open Indicator
• Reset Status Indicator
• Heating-Mode Indicator
Solid State Ignition Control
• Power On/Standby Indicator
• Gas Valve Circuit Monitor
• Reverse Polarity Indicator
• Improper Grounding Error Indicator
• Lock Out Condition Indicator with Auto Retry
• Low Gas Pressure & Blower Prover Indicator
• Weak Flame Sense Indicator
• Combustion Operation Indicator
• Call for Heat Indicator
Solid State Temperature Probe
• Solid State Thermistor Technology
• Plus or minus 2°Fahrenheit
• Direct immersion package
Silicon Nitride Hot Surface Ignitor
• Rugged
• Dependable
• Separate Flame Prover Rod
• Quick connect terminals
• Adaptive learning technology extends ignitor life
www.hotwater.com
Revised September 2008
AOSCG10500
PG 2 OF 4
ROUGH-IN DIMENSIONS
SIDE VIEW OF BTN
Models 120-400
Commercial Gas Water Heaters
Clearance to Combustibles Clearance to Non-Combustibles
Model Sides & Rear Top Cover Sides & Rear Top Cover
BTN120 1” 12” 0” 12”
BTN154 1” 12” 0” 12”
BTN180 1” 12” 0” 12”
BTN199 1” 12” 0” 12”
BTN200(A) 1” 12” 0” 12”
BTN250(A) 2” 12” 0” 12”
BTN275(A) 2” 12” 0” 12”
BTN310(A) 2” 12” 0” 12”
BTN366(A) 3” 12” 0” 12”
BTN400(A) 3” 12” 0” 12”
TOP VIEW OF BTN
Gas Pressure Requirements
Natural Gas Propane Gas
Max. Supply Pressure 14” w.c. 14” w.c.
Min. Supply Pressure 5.0” w.c. 11” w.c.
Manifold Pressure 3.5” w.c. 10” w.c.
Water Connections in Inches
Inlet Outlet
Models Top Front Back Top Front Back
BTN120 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
BTN154 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
BTN180 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
BTN199 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
BTN200(A) 1 1/2 1 1/2 2 1 1/2 1 1/2 2
BTN250(A) 1 1/2 1 1/2 2 1 1/2 1 1/2 2
BTN275(A) 1 1/2 1 1/2 2 1 1/2 1 1/2 2
BTN310(A) 1 1/2 1 1/2 2 1 1/2 1 1/2 2
BTN366(A) 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
BTN400(A) 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
Electrical Specifi cations
Volts Amps
BTN 120VAC 5.0
www.hotwater.com
Revised September 2008
AOSCG10500
PG 3 OF 4
Commercial Gas Water Heaters
Approx.
Model
BTN120 71 nat 120,000 63 4 1/4 59 1/2 50 7/8 19 5/8 19 1/2 51 7/8 6 27 3/4 400 -BTN154 81 nat 154,000 68 4 1/2 62 53 5/8 20 1/2 21 1/2 54 5/8 6 27 3/4 470 -BTN180 99 nat 180,000 72 4 1/2 70 61 5/8 20 1/2 21 1/2 61 6 27 3/4 470 --
BTN199 99 nat 199,000 72 4 1/2 70 61 5/8 20 1/2 21 1/2 61 6 27 3/4 470 -BTN200(A) 100 nat 199,000 72 4 1/2 70 61 5/8 20 1/2 21 1/2 61 6 27 3/4 603 625
BTN250(A) 100 nat 250,000 72 4 1/2 70 61 5/8 20 1/2 21 1/2 61 6 27 3/4 603 625
BTN275(A) 100 nat 275,000 72 4 1/2 70 61 5/8 20 1/2 21 1/2 61 6 27 3/4 603 625
BTN310(A) 85 nat 310,000 73 4 1/2 72 62 1/2 20 1/2 21 1/2 63 6 27 3/4 603 625
BTN366(A) 85 nat 366,000 73 4 1/2 72 62 1/2 22 1/2 21 1/2 63 6 27 3/4 725 833
BTN400(A) 85 nat 390,000 73 4 1/2 72 62 1/2 22 1/2 21 1/2 63 6 27 3/4 725 833
All dimensions are in inches.
Model
BTN120 120,000 71 388 291 233 194 166 145 129 116 106 97 90 83
BTN154 154,000 81 498 373 299 249 213 187 166 149 136 124 115 107
BTN180 180,000 99 582 436 349 291 249 218 194 175 159 145 134 125
BTN199 199,000 99 643 482 386 322 276 241 214 193 175 161 148 138
BTN200(A) 199,000 100 643 482 386 322 276 241 214 193 175 161 148 138
BTN250(A) 250,000 100 808 606 485 404 346 303 269 242 220 202 186 173
BTN275(A) 275,000 100 889 667 533 444 381 333 296 267 242 222 205 190
BTN310(A) 310,000 85 1002 752 601 501 430 376 334 300 273 251 231 215
BTN366(A) 366,000 85 1183 887 710 592 507 444 394 355 323 296 273 254
BTN400(A) 390,000 85 1261 945 756 630 540 473 420 378 344 315 291 270
Tank Cap.
(Gals.)
Input
Rating
Btu/Hr.
Type of
Gas
Gal.
Input
Rating
Btu/Hr.
30 40 50 60 70 80 90 100 110 120 130 140
Dimension Tables for BTN Models 120-400
ABC DEFGHIJ
Recovery Capacities for BTN
Temperature Rise - Degrees F - Gallons Per Hour
Approx. Ship.
Weight
Std. ASME
SUGGESTED SPECIFICATION
Water Heater(s) shall be Model __________ as manufactured by A. O. SMITH, or equal. Water heater(s) shall be of glass-lined design,
and gasfi red, equipped to burn __________ gas and design certifi ed by the Underwriter Laboratory under Volume III tests for
commercial heaters for delivery of 180°F water, and meet the requirements of ASHRAE/IES 90.1-2004. Heaters shall have an input
rating of __________ and a recovery rating of __________ GPH at a temperature rise of 100°F with a storage capacity of __________
gallons. Heaters shall be equipped with 1 1/2” water inlet and outlet openings (BTN 200, 250, 275, 310 rear openings are 2”), a 2 3/4”
x 3 3/4” boiler-type handhole cleanout and shall have a maximum working pressure of 160 psi. Water heater(s) shall be equipped
with an integrated control system consisting of a 180°F adjustable thermostat with upper and lower sensing bulbs, which average
the water temperatures at the top and bottom of the tank for maximum water temperature control. Heater(s) shall be provided
with a manual reset gas shutoff device, a gas pressure regulator set for the type of gas supplied, coated steel burners, an approved
draft diverter, anodes for cathodic protection, fl ue damper and IID system. A.G.A. pressure and temperature relief valve shall be
furnished and installed by the factory. The heater shall be insulated with foam insulation or equal. The outer jacket shall have a
baked enamel fi nish over a bonderized undercoating. All internal surfaces of the heater(s) exposed to water shall be glass-lined
with an alkaline borosilicate composition that has been fused-to-steel by fi ring at a temperature range of 1400° to 1600°F. Heater
tank shall have a 3 year limited warranty against corrosion or sediment buildup as outlined in the written warranty. Fully illustrated
instruction manual to be included.
For Technical Information and Automated Fax Service, call 800-527-1953. A.O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
www.hotwater.com
Revised September 2008
AOSCG10500
PG 4 OF 4
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