®
Commercial Gas Water Heaters
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 April 2012
PG 4 OF 4
www.hotwater.com
AOSCG10500
Dimension Tables for BTN Models 120-400
Model
Approx.
Tank Cap.
(Gals.)
Type of
Gas
Input
Rating
Btu/Hr.
A
B
C
D
E
F
G
H
I
J
Approx. Ship.
Weight
Std.
ASME
BTN120
+
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
--
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
61 5/8
20 1/2
21
3/4
61
6
27 3/4
550
--
BTN199
100
nat
199,000
72
4 1/2
70
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
70
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
70
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
70
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
Recovery Capacities for BTN
Model
Input
Rating
Btu/Hr.
Gal.
40
0
F
50
0
F
60
0
F
70
0
F
80
0
F
90
0
F
100
0
F
110
0
F
120
0
F
130
0
F
140
0
F
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
*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.
