A.O. Smith GAHH-40, GAHH-50 Technical Documents

Residential Gas Water Heaters

Effex

®

HIGH EFFICIENCY ATMOSPHERIC
GAS WATER HEATER

PRESSURIZED COMBUSTION SYSTEM

Exclusive and patented pressurized combustion chamber with an advanced
air intake blower delivers superior efficiency. Much like a turbocharger, the
blower distributes an optimum air-to-gas mixture pushing exhaust gases
through the highly restricted flue baffle. The end result is the most efficient
atmospheric gas product on the market with a .70 Energy Factor (EF).

INSTALLATION FRIENDLY

Allows for easy replacement of standard atmospheric vent heaters.
Easily connects to existing B-vent.

FAN-ASSISTED, CATEGORY 1 APPLIANCE

Plugs into standard 110/120V outlet (10 foot power cord included).

24V ELECTRONIC CONTROLS

Tighter differential for more consistent hot water delivery.

ELECTRONIC IGNITION

The durable hot surface ignitor eliminates pilot relight issues (no standing pilot).

LCD USER INTERFACE

Easy-to-read, eye level display. Simple temperature settings and adjustments. Service
diagnostics are in plain text.

POWERED ANODE ROD

Powered anodes are non-sacrificial, so they do not deplete over time. Additionally,
they provide exceptional performance in all water conditions.

MEETS ENERGY EFFICIENCY REQUIREMENTS FOR MOST GAS UTILITY
REBATE PROGRAMS AND IS ENERGY STAR® QUALIFIED

DURABLE TAMPER-RESISTANT BRASS DRAIN VALVE

DYNACLEAN™ DIFFUSER DIP TUBE

Helps reduce lime and sediment buildup, maximizes hot water output.
Made from long-lasting PEX cross-linked polymer.

GREEN CHOICE®GAS BURNER

Patented “Eco-Friendly” Green Choice®gas burner reduces NOx emissions by 33%
compared to standard burners and meets low NOx requirements of less than 40ng/j.

CSA CERTIFIED AND ASME RATED T&P RELIEF VALVE

CODE COMPLIANCE: UBC, CEC, SBCC, CABO, HUD, BOCA NATIONAL CODES,
CURRENT EDITION ASHRAE/IESNA 90.1 AND 2004 NAECA STANDARDS

DESIGN-CERTIFIED BY CSA INTERNATIONAL

According to ANSI Z21.10.1 - CSA 4.1Standards governing storage-type water heaters.

6-YEAR LIMITED TANK AND PARTS WARRANTY

For complete information, consult written warranty.

Revised May 2012

SERIES 100

SHOWN

®

Low Lead Content

Page 1 of 2

AOSRG46900

Effex

Residential Gas Water Heaters

®

HIGH EFFICIENCY

1/2”

BTU

INPUT

PER

HOUR

RECOVERY

AT 90°F

RISE

DRAFT HOOD

T&P VALVE

FOAM

THICKNESS

(INCHES)

FIRST
HOUR

GPH

GPH

GALLON

CAPACITY

ENERGY

FACTOR

40 0.70 40,000 43 2

50 0.70 40,000 43 2

MODEL

NUMBER

GAHH-40 61-3/4 58 20 13-1/4 8 51-1/2 23-1/4 25 3 or 4 157

GAHH-50 60-5/8 57-1/8 22 13-1/4 8 50-1/2 25-1/4 27 3 or 4 171

SERIES

RATING

70

102

81

100

All dimension in inches.
For Canadian models add T25 SMR. i.e. GAHH-40-T25.
Recovery capacity based on actual performance tests.
Water Connections – 3/4" on all models.
Not available in LP gas (Propane).
All models are certified from sea level to 10,100 ft. elevations.

DIMENSIONS IN INCHES

DRAFT

HOOD

OUTLET

SHIPPING

WEIGHT

(LBS)A B C D E F G H

C

A

B

GAS VALVE

ON/OFF SWITCH

DRAIN VALVE

F

G

H

HOT

CONNECTION

ANODE ROD

COLD
CONNECTION

D

E

TOP VIEW

FRONT VIEW

Maximum Hydrostatic Working Pressure: 150 PSI

Flammable Vapor Ignition Resistant Water Heaters

This A. O. Smith FVIR design meets the American National Standards Institute standards (ANSI Z21.10.1 - CSA

4.1 Standards) that deal with the accidental or unintended ignition of flammable vapors outside the water
heater, such as those emitted by gasoline.

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 May 2012 Page 2 of 2

www.hotwater.com AOSRG46900