A. O. Smith GPDH-40 User Manual

SEALED SHOT®FEATURES

No Longer in Production

POWER DIRECT-VENT DESIGN

Two-pipe closed-combustion system draws all make-up air from
outside the home, eliminating problems caused by insufficient
indoor ventilation.

For installation versatility, system permits combined horizontal
and vertical venting and air intake runs up to 45 feet (including
one 90º elbow) using 3” Schedule 40 PVC, CPVC or ABS pipe.

Residential Gas Water Heater s

CLOSED COMBUSTION
POWER DIRECT-VENT

NEW INTELLI-VENT GAS CONTROL

Equipped with nearly-indestructible silicon nitride hot surface
igniter, and advanced electronics for more precise control of
water temperature and easy to understand system diagnostics.

6-YEAR LIMITED TANK & PARTS WARRANTY

For complete information, consult written warranty or A.O. Smith Water Products
Company.

QUIET MODULAR BLOWER

Equipped with 110/120 volt electrical system (rating 3 amps or less), 7-foot cord,
standard 3-prong male connector.

A.O. SMITH DYNACLEAN™ DIFFUSER DIP TUBE

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

COREGARD™ ANODE ROD

An A.O. Smith exclusive. Aluminum anode with stainless steel core protects tank
against corrosion longer than ordinary mild steel anodes.

GREEN CHOICE™ GAS BURNER

Patented “eco-friendly” design reduces NOx emissions up to 33% and
complies with Southern California and Texas requirements.

DURABLE TAMPER-RESISTANT BRASS DRAIN VALVE

®

A.O. SMITH PERMAGLAS

Protects steel tank from rust.

FACTORY-INSTALLED TEMPERATURE &
PRESSURE (T&P) RELIEF VALVE

CODE COMPLIANCE: UBC, CEC, SBCC, CABO, HUD, BOCA
NATIONAL CODES, ASHRAE/IES 90.1-1999 AND 2004 NAECA

DESIGN CERTIFIED BY CSA INTERNATIONAL

According to ANS Z21.10.1 standards governing storage-type water heaters.

GLASS COATING

www.aosmithwaterheaters.com

RESIDENTIAL

F

E

C

D

23.5"

3" VENT

4"

11.5" MIN.

FROM TOP OF

HEA TER TO

CENTER LINE

OF FLUE

1/2" GAS

CONNECTION

B A

Gas Water Heaters

CLOSED COMBUSTION
POWER DIRECT-VENT

MODEL

NUMBER

GPDH-40 73 .59 40 40,000 41 16 57 48-1/2 21 15 8 42 3 224

GPDH-50 80 .58 50 40,000 41 16 66 57-1/2 21 15 8 51 3

GPDT-50 80 .58 50 65,000 64 16 69-1/2 61 21 15 8 54-1/2 3 232

GPDX-75 123 .53 75 70,000 72 16 71-1/2 61-1/2 26-1/4 15-1/2 8 54-3/4 3 300

Recovery capacity based on actual performance tests.
Water connections, 3/4" on all models.

†

Propane inputs/recoveries:GPDH-40: 36,000BTU/37GPH

*R Value shown is “performance rated.”

IMPORTANT: VENTING AND COMBUSTION AIR REQUIREMENTS

Read and follow requirements shown in the Installation Manual for Sealed Shot
Power Direct-Vent Gas water heaters dealing with type, placement and length of
vent pipe and vent termination, as well as clearances required to provide adequate
combustion and proper ventilation.

FIRST
HOUR

RATING

GALLONS

ENERGY
FACTOR

GAL.
CAP.

GPDH-50: 38,000BTU/39GPH
GPDT-50: 60,000BTU/59GPH
GPDX-75: 65,000BTU/67GPH

BTU

INPUT

PER HOUR

NATURAL

RECOVERY

90ºF RISE

GALLONS

†

PER HOUR

R

VALUE*

DIMENSIONS IN INCHES

A B C D E F

BLOWER

OUTLET

APPROX.

SHIPPING

WEIGHT

(LBS)

232

500 Lindahl Parkway, Ashland City, TN 37015

www.aosmithwaterheaters.com

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.