A.O. Smith QOS1215 Specifications

®

Domestic Hot Water Boilers

CONSERVATIONIST

®

Energy Saving Copper Heat Exchanger

FEATURES

ALL NON-FERROUS WATERWAYS

Rustproof because water comes in contact with nothing but copper, brass or bronze. Copper transfers
heat eight times faster than ferrous metals yet offer remarkable structural strength without excessive
weight. Free from the effects of thermal shock.

EFFICIENT COPPER COIL COMBUSTION CHAMBER

Continuous coils of tightly wound copper tubing form a unique combustion chamber. Water

circulating thru the coils, around the fl ame, captures radiant heat which may otherwise be lost.

HIGH EFFICIENCY STAINLESS STEEL BURNER

Developed especially for A. O. Smith water heaters using the very latest burner principles.

FORCED WATER CIRCULATION IMPROVES SYSTEM EFFICIENCY

Water moving at 2 to 4 feet per second helps to prevent lime buildup and also scrubs extra heat from
the copper coil combustion chamber.

AUTOMATIC SAFETY CONTROLS AND ELECTRONIC IGNITION

Proven pilot ignition system provides fl ame failure response in less than one (1) second. Redundant
high limit controls and gas valves assure safe shutoff in the event of overheating or fl ame failure.
Requires 120V 60Hz, maximum inlet gas pressure of 14” WC and activation of heater by external
temperature control.

THERMAL BALANCER (HW-200M, HW225M)

Patented thermal balancer functions as a pump shutoff delay switch. It allows the pump and heater
to activate simultaneously but delays pump shut off for 120 ± 30 seconds after heater shuts down.
This allows the high temperature water to clear the heater thus utilizing all heat that had been
generated plus educing the scale forming tendencies of motionless hot water (Not to be used on
booster recovery systems)

.

HW-120M,
HW-160M,

HW-200M, AND

HW-225M

PRESSURE RELIEF VALVE

125 psi.

MAIN BURNER REGULATION

Factory adjusted for gas required.

JACKET

Prefi nished with a bonderized coating followed by a baked on enamel fi nish.

CERTIFICATION

All models are design-certifi ed by CSA International, according to ANSI Z21.10.3 - CSA 4.9 standards
governing storage-type water heaters. Models are ASME certifi ed and are design-certifi ed by
NSF International to NSF Sanitation 5. Models meet the thermal efficiency and standby
loss requirements of the U.S. Department of Energy and current edition of ASHRAE/IESNA 90.1.

WORKING PRESSURE

160 psi.

LIMITED WARRANTY OUTLINE

If the coil, heat exchanger or burner should fail within 5 years, under the terms of the warranty, then
A. O. Smith will furnish a replacement part; installation, labor handling and local delivery are extra.
THIS OUTLINE IS NOT A WARRANTY. For complete information, consult the written warranty or
A. O. Smith.

Approved for non-automatic circulating applications for domestic after heating only.

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Low Lead Content

H

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AOSDG25500

®

Domestic Hot Water Boilers

CONSERVATIONIST

Energy Saving Copper Heat Exchanger

®

ALL DIMENSIONS IN INCHE S

Model s A B C D E F G H J K L M N W

HW-120 M 47 3/ 8 30 3/ 8 23 5/ 8 20 3/ 4 5 1/ 2 1 0 1 1 13/1 6 6 26 1 1/1 6 20 3/ 4 1 1/ 4 1 1/ 2 1 3/4
HW-160 M 50 1/ 8 30 3/ 8 23 5/ 8 20 3/ 4 5 1/ 2 1 0 1 1 13/1 6 7 26 1 1/1 6 20 3/ 4 1 1/ 4 1 1/ 2 1 3/4
HW-200 M 52 7/ 8 33 1/ 8 27 1/ 8 20 3/ 4 5 1/ 2 1 0 1 1 13/1 6 7 26 1
HW-225 M

33 1/ 8 27 1/ 8 20 3/ 4 5 1/ 2 1 0 1 1 13/1 6 7 26 1 1/1 6 20 3/ 4 1 1/ 4 1 3/ 4 1 3/4

52 7/8

1/1 6 20 3/ 4 1 1/ 4 1 1/ 2 1 3/4

HE A TER PERFORMANCE D A T A

NOTE : T o compensate for the e f fects of high altitude areas above 2,000 feet, input rating and therefore recovery ratings should be reduced

approximately 4% for each 1,000 feet above sea level.

R E C OVE R Y CA P AC ITIE S

Input Rating BTU/H r . T emperature Rise - Degrees F - Gallons Per Hour

Mode l Nat. & Propane Ga s 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 12 0 13 0 14 0

HW-120 M 120,00 0 30 0 24 0 20 0 17 1 15 0 1 3 3 12 0 1 0 9 1 0 0 9 2 8 6

HW-160 M 160,00 0 38 5 30 8 25 7 22 0 19 3 1 7 1 15 4 1 4 0 1 2 8 1 1 8 1 1 0
HW-200 M 199,00 0 48 7 38 9 32 4 27 8 24 3 21 6 19 5 17 7 16 2 15 0 13 9
HW-225 M 225,000 Nat. Gas Onl y 54 3 43 4 36 2 31 0 27 1 24 1 21 7 19 7 18 1 16 7 15 5

Recovery rating of models shown in chart above are ob t ained by actual efficiency test da t a, by a recognized

Suggested Specifi cations

Water Heater(s) shall be Model No. as manufactured by A. O. Smith, or an approved equal. Heater(s) shall be gas-fi red, as certifi ed by CSA International, NSF capable of supplying GPH at 100°
F temperature rise when equipped to burn gas, and bear the ASME code symbol. Heater(s) shall be reverse fl ow type having all non-ferrous waterways, and employing a copper fi nned heat exchanger and a
tightly wound copper coil combustion chamber. Boiler(s) shall be equipped with an electric gas valve of the step-opening type, a 195° auto-reset fi xed high limit control which will break the electric circuit on temperature rise,
intermittent electronic ignition with one (1) second shutdown in the event of pilot fl ame failure, a gas pressure regulator properly set for the gas to be supplied, stainless steel main burners, and a coil limit switch for shutoff
in event of excessive water temperature, thermal balancer (Models HW-200 M and HW-225M), and a certifi ed draft diverter. Certifi ed for combustible fl ooring. Outer jacket shall be of baked enamel fi nish. Fully illustrated
instruction manual to be included. Coil, heat exchanger and burner shall have a 5 year limited warranty as outlined in the written warranty.

Certification Agenc y .

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.

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www.hotwater.com

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AOSDG25500