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Ultra-Low NOx
Commercial Gas Water Heaters
MASTER-FIT® ULTRA-LOW NOx
COMMERCIAL GAS WATER HEATERS
FAN ASSISTED COMBUSTION
• The blower is built into the low NOx burner assembly
• Complies with California SCAQMD Rule 1146.2 and
other air quality management districts with similar
NOx emission requirements of 14 ng/J or 20 ppm
AIR-FLAPPER
• A stainless steel air flapper is used inside the premix
system to replace externally mounted flue damper to
minimize the standby heat loss and to minimize the
overall heater height
METAL VENTING
• Rated Category I Appliance. Uses standard double
wall type “B” vent
• Can be commonly vented with other Category I
appliances
• Vent connects directly to the vent connector outlet
• An excellent choice for retrofit and upgrade
installations
• When common venting multiple BTL water heaters
into a common vent system, follow the common vent
tables in the current edition of the National Fuel Gas
Code book for Category 1, Fan assisted heaters.
WATER CONNECTIONS
• For ease of installation, all BTL’s feature water
connections on the top, front, and back
• “The Eliminator” inlet water connection eliminates
harmful scale buildup, extending the life of the
product
• The front inlet connection must be used for the
Eliminator benefits
GLASSLINED TANK
• Permaglas® Ultracoat is the proprietary ceramic
coating developed by A. 0. Smith’s ceramic engineers
specifically for the heater
• Glassing is applied after the complete tank has been
assembled to give a seamless barrier against hot
water corrosion
INSTALLED COST SAVINGS
• The BTL uses a smaller vent diameter than a natural
draft water heater which saves on installation cost
FULLY AUTOMATIC DIGITAL CONTROLS
WITH SAFETY SHUTOFF
• Accurate, dependable control system
• Manual reset gas shutoff device for added safety
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
• Spark ignitor and power ON/OFF switch
EASY TO INSTALL
• Completely factory-assembled
• Only gas, water, vent and electric connections need to
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
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/IES 90.1
3-YEAR LIMITED TANK / 1-YEAR
LIMITED PARTS WARRANTY
• For complete warranty information, consult written
warranty or go to howater.com.
MODELS
BTL-120 THRU BTL-400(A)
SERIES 200
ON SELECT MODELS
© December 2015 A. O. Smith Corporation. All rights reserved.
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
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AOSCG10503
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Ultra-Low NOx
Commercial Gas Water Heaters
ROUGH IN DIMENSIONS: MASTER-FIT BTL-120 through BTL-400(A)
I
M
F
TOP OUTLET
1 1/2 NPT
C
A
HD
G
J
FRONT VIEW BACK VIEW
E
TOP VIEW
B
TOP INLET
1 1/2 NPT
K
L
DIMENSIONS
Model Dimension
A 63-3/4 161.93 71-3/4 182.25 71-3/4 182.25
B 37 93.98 37 93.98 37 93.98
C 65 165.1 73 185.42 73 185.42
D 52-3/4 133.99 60-3/4 154.31 60-3/4 154.31
E 20-3/4 52.71 20-1/2 52.07 20-1/2 52.07
F 21 53.34 21 53.34 21 53.34
G 3/4 NPT
H 53 134.62 61 154.94 61 154.94
I 6 15.24 6 15.24 6 15.24
J 27-3/4 70.49 27-3/4 70.49 27-3/4 70.49
K 1-1/2 NPT
L 1-1/2 NPT
M N/A N/A 8 20.3 8 20.3
Approx. Shipping Weight
Standard 605 174 665 301 740 335
ASME N/A N/A 715 324 790 358
Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement
All models rated at 80% thermal efficiency
“A” after the model number designates ASME construction.
BTL models not available in LP gas.
BTL-120, 154, 180, 198 BTL-199, 250(A), 275(A) BTL-310(A), 366(A), 400(A)
Inches cm Inches cm Inches cm
BTL-120, 154, 180, 198 BTL-199, 250(A), 275(A) BTL-310(A), 366(A), 400(A)
lbs. kg lbs. kg lbs. kg
© December 2015 A. O. Smith Corporation. All rights reserved.
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
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AOSCG10503
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Ultra-Low NOx
Commercial Gas Water Heaters
OTHER MASTER-FIT® FEATURES NSF LEG KIT
• 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
• Adjustable thermostat with a 120-180°F range
Model Number Capacity Input Btuh Input kW
BTL-120
BTL-154
BTL-180
BTL-198
BTL-199
BTL-250(A)
BTL-275(A)
BTL-310(A)
BTL-366(A)
BTL-400(A)
“A” after the model number designates ASME construction.
BTL models not available in LP gas.
Gallon 81
Litres 307
Gallon 81
Litres 307
Gallon 81
Litres 307
Gallon 81
Litres 307
Gallon 100
Litres 378
Gallon 100
Litres 378
Gallon 100
Litres 378
Gallon 86
Litres 325
Gallon 86
Litres 325
Gallon 86
Litres 325
120,000 35
154,000 45
180,000 53
199,000 58
199,000 58
250,000 73
275,000 81
310,000 91
366,000 107
390,000 114
• Meets NSF Standard 5 with optional leg kit -Part #9008883005
• Leg kit increases height by 4”
GAS AND ELECTRICAL CHARACTERISTICS
Model Gas Type
120 Thru 275(A) Natural 3.5” W.C. (0.87 kPA) 14” W.C. (3.48 kPA) 120/60 <5
310 (A) Thru 400 (A) Natural 4.5” W.C. (1.12 kPA) 14” W.C. (3.48 kPA) 120/60 <5
Model
ALL
© December 2015 A. O. Smith Corporation. All rights reserved.
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
“A” Right Side “B” Left Side “C” Back “D” Ceiling
0” 0” 0” 12”
0 cm 0 cm 0 cm 30.5 cm
Gas Supply Pressure
Minimum Maximum
Clearance to Combustibles
Voltz/Hz Amperes
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RECOVERY CAPACITIES
Model Number
BTL-120
BTL-154
BTL-180
BTL-198
BTL-199
BTL-250(A)
BTL-275(A)
BTL-310(A)
BTL-366(A)
BTL-400(A)
For ASME models add (A) to the end of the model number example BTL-400A
Recoveries based on 80% thermal efficiency
F° 36 40 50 54 60 70 72 80 90 100 108 110 120 126 130 140
C° 20 22 28 30 33 39 40 44 50 56 60 61 67 70 72 78
GPH 320 288 230 213 192 165 160 144 128 115 107 105 96 91 89 82
LPH 1212 1091 872 808 727 623 606 545 485 436 404 397 364 346 336 312
GPH 411 370 296 274 246 211 205 185 164 148 137 134 123 117 114 106
LPH 1555 1399 1120 1037 933 800 777 700 622 560 518 509 466 444 431 400
GPH 480 432 346 320 288 247 240 216 192 173 160 157 144 137 133 123
LPH 1818 1636 1309 1212 1091 935 909 818 727 654 606 595 545 519 503 467
GPH 531 478 382 354 319 273 265 239 212 191 177 174 159 152 147 137
LPH 2009 1808 1447 1340 1206 1033 1005 904 804 723 670 658 603 574 556 517
GPH 531 478 382 354 319 273 265 239 212 191 177 174 159 152 147 137
LPH 2009 1808 1447 1340 1206 1033 1005 904 804 723 670 658 603 574 556 517
GPH 667 600 480 445 400 343 333 300 267 240 222 218 200 191 185 171
LPH 2524 2272 1818 1683 1515 1298 1262 1136 1010 909 841 826 757 721 699 649
GPH 734 660 528 489 440 377 367 330 293 264 245 240 220 210 203 189
LPH 2777 2499 1999 1851 1666 1428 1388 1250 1111 1000 926 909 833 793 769 714
GPH 827 744 595 551 496 425 413 372 331 298 276 271 248 236 229 213
LPH 3130 2817 2254 2087 1878 1610 1565 1409 1252 1127 1043 1024 939 894 867 805
GPH 976 879 703 651 586 502 488 439 391 352 325 320 293 279 270 251
LPH 3696 3326 2661 2464 2217 1901 1848 1663 1478 1330 1232 1209 1109 1056 1023 950
GPH 1040 936 749 694 624 535 520 468 416 375 347 340 312 297 288 268
LPH 3938 3544 2835 2625 2363 2025 1969 1772 1575 1418 1313 1289 1181 1125 1091 1013
Ultra-Low NOx
Commercial Gas Water Heaters
U.S. Gallons/ Hr. and Litres/ Hr. at Temperature Rise Indicated
SPECIFICATION
Water Heater(s) shall be Model BTL_________ as manufactured by A. 0. Smith, or equal. Water heater(s) shall be of glasslined design, gas fired, equipped to
burn natural gas and design certified by the Underwriters Laboratory under Volume Ill tests for commercial heaters for delivery of 180°F water and meets the
thermal efficiency and standby loss requirements of the U.S. Department of Energy and Current Edition of ASHRAE/IES 90.1. Heaters shall have an input rating
of ___________ BTU 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, 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, anodes for cathodic protection 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 call 800-527-1953. A.O.Smith Corporation reserves the right to make product changes or improvements without prior notice.
© December 2015 A. O. Smith Corporation. All rights reserved.
www.hotwater.com | 800-527-1953 Toll-Free USA
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AOSCG10503
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