A.O. Smith BTN 120-40D Suggested Specification, Commercial Gas Water Heaters, AOSCG10500

Commercial Gas Water Heaters

				Dimension Tables for BTN Models 120-400
	Approx.	Type of	Input													Approx. Ship.
Model	Tank Cap.		Rating	A	B	C	D	E	F		G		H	I	J	Weight
		Gas
	(Gals.)		Btu/Hr.													Std.	ASME
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.
					Recovery Capacities for BTN
	Input					Temperature Rise - Degrees F - Gallons Per Hour
Model	Rating	Gal.	30	40	50	60	70	80	90		100		110		120	130	140
	Btu/Hr.
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

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 __________ gas and design certified 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, flue 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 finish 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 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.

www.hotwater.com	AOSCG10500
Revised September 2008	PG 4 OF 4