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®
Commercial Gas Water Heaters
MasterFit® Low NOx Commercial Gas Tank-Type
Water Heaters
FEATURES
Eighty plus percentage thermal efficiency 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 retrofit and upgrade installations.
WATER CONNECTIONS - For ease of installation, all BTNs feature water connections on the
top, front, and rear.
GLASSLINED TANK - Permaglas® Ultracoat is the proprietary ceramic coating developed
by A. O. Smith’s ceramic engineers specifically 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 Fuel Gas Code Table 13 Fan Sizing Charts to determine vent
diameter and specifications. 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 5.2” W.C. Natural Gas.
- The blower is built into the top cover, factory
MODELS
BTN
120-400(A)
FOAM INSULATION - Saves fuel, helps reduce standby heat loss.
JACKET- Heavy gauge steel finished with a baked enamel finish over a bonderized undercoat.
EASY CLEANING - Handhole cleanout allows access for easy cleaning.
FULLY TESTED FOR SAFETY AND PERFORMANCE - Design certified by the
Underwriters Laboratory for 180°F hot water service. Meets rigid requirements of the National
Sanitation Foundation when equipped with optional leg kit. Certified for use on combustible
flooring.
INTERMITTENT IGNITION DEVICE - Eliminates standing pilot. Provides flame 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 - CoreGard™ long-life, stainless steel core anode rods.
PLUG KITS - Pipe nipples and caps are included to plug unused water connections.
APPROVAL RATINGS AND CERTIFICATION - All models meet ANSI Z21.10.3 - CSA 4.3
standards and the thermal efficiency and standby loss requirements of the U.S. Department
of Energy and current edition of ASHRAE/IESNA 90.1. Models also comply with California
Energy Commission (CEC) and Texas low NOx and Air Quality Management Districts with
requirements of less than 40 ng/j.
Low Lead Content
Approved to NSF Standard 5
with option leg kit.
AOSCG10500
Revised October 2012 PG 1 OF 4
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®
Commercial Gas Water Heaters
OTHER FEATURES
• Equipped with gas pressure regulator and pilot filter • Integral automatic gas shutoff system prevents excessive water temperature • CSA
Certified and ASME Rated T&P Relief valve are 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
Revised October 2012
www.hotwater.com
PG 2 OF 4
AOSCG10500
Page 3
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”
BTN199C 2” 12” 2” 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
Max. Supply Pressure 14” w.c.
Min. Supply Pressure 5.2” w.c.
Manifold Pressure 3.5” 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
BTN199C 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 1 1/2 1 1/2 1 1/2 1 1/2
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 Specifications
Volts Amps
BTN 120VAC 5.0
Revised October 2012
www.hotwater.com
PG 3 OF 4
AOSCG10500
Page 4
®
Commercial Gas Water Heaters
Approx.
Model
BTN120
BTN154 81 nat 154,000 68 4 1/2 62 53 5/8 20 1/2 21 3/4 54 5/8 6 27 3/4 550 -BTN180 100 nat 180,000 72 4 1/2 70-7/8
BTN199 100 nat 199,000 72 4 1/2 61 5/8 20 1/2 21 3/4 61 6 27 3/4 550 --
BTN199C* 93 nat 199,000 72 4 1/2 70 61 5/8 20 1/2 21 3/4 61 6 27 3/4 620 -BTN200(A) 100 nat 199,000 72 4 1/2 61 5/8 20 1/2 21 3/4 61 6 27 3/4 660 710
BTN250(A) 100 nat 250,000 72 4 1/2 61 5/8 20 1/2 21 3/4 61 6 27 3/4 660 710
BTN275(A) 100 nat 275,000 72 4 1/2 61 5/8 20 1/2 21 3/4 61 6 27 3/4 660 710
BTN310(A)* 85 nat 310,000 73 4 1/2 72 62 1/2 20 1/2 21 3/4 63 6 27 3/4 720 770
BTN366(A) 85 nat 366,000 73 4 1/2 72 62 1/2 22 1/2 21 1 63 6 27 3/4 830 880
BTN400(A) 85 nat 390,000 73 4 1/2 72 62 1/2 22 1/2 21 1 63 6 27 3/4 830 880
*Models rated at 82% thermal efficiency
BTN199C Models are available for sale in California only.
All dimensions are in inches.
+BTN120 is approved for 5” vent using a 6x5 reducer.
Model
BTN120 120,000 71 288 239 193 164 144 128 115 105 96 89 82
BTN154 154,000 81 369 295 247 211 185 184 148 134 123 114 106
BTN180 180,000 100 432 345 289 247 218 192 173 157 144 133 123
BTN199 199,000 100 477 382 319 273 239 212 191 174 159 147 136
BTN199C 199,000 93 477 382 319 273 239 212 191 174 159 147 136
BTN200(A) 199,000 100 477 382 319 273 239 212 191 174 159 147 136
BTN250(A) 250,000 100 600 480 401 343 300 266 240 218 200 184 171
BTN275(A) 275,000 100 659 528 441 377 332 293 264 240 220 203 188
BTN310(A) 310,000 85 743 595 497 425 372 330 297 270 248 229 212
BTN366(A) 366,000 85 878 702 587 502 439 390 351 319 293 270 251
BTN400(A) 390,000 85 935 748 626 534 468 416 374 340 312 288 267
Tank Cap.
(Gals.)
+
Input
Rating
Btu/Hr.
Type of
Gas
71 nat 120,000 63 4 1/4 59 1/2 50 7/8 19 5/8 19 3/4 51 7/8 6 27 3/4 520 --
Gal.
Input
Rating
Btu/Hr.
400F500F600F700F800F900F 1000F 1100F 1200F 1300F 1400F
Dimension Tables for BTN Models 120-400
ABC D EFGHIJ
61 5/8 20 1/2 21 3/4 61 6 27 3/4 550 --
70-7/8
70-7/8
70-7/8
70-7/8
Recovery Capacities for BTN
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 gasfired, equipped to burn natural gas and design certified by the Underwriter Laboratory under Volume III tests for commercial
heaters for delivery of 180°F water, and meet the thermal efficiency and standby loss requirements of the U.S. Department of Energy
and Current Edition of ASHRAE/IESNA 90.1. 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, flue
damper and IID system. CSA Certified and ASME Rated T&P 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 finish over a bonderized undercoating.
All internal surfaces of the heater(s) exposed to water shall be glasslined with an alkaline borosilicate composition that has been
fused-to-steel by firing 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.
Revised October 2012
www.hotwater.com
AOSCG10500
PG 4 OF 4
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