A.O. Smith GUC-30, GUC-40, GUR-40, GUC-50, GUR-50 User Manual

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PROLINE® ULTRA-LOW NOx

COMMERCIAL-GRADE RESIDENTIAL

COMMERCIAL-GRADE

RESIDENTIAL GAS WATER HEATERS

INTELLIGENT CONTROL LOGIC

• The internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response to optimize performance.

• Uses a thermopile to generate the power needed to operate the electronic gas control without requiring an external power source

• The electronic gas control incorporates an LED status indicator that monitors system operation & service diagnostics.

HIGH ENERGY FACTORS

• Eco-friendly non-CFC foam insulation, heat traps and specially designed combustion chamber combine to produce a high Energy Factor for maximum savings on operating costs.

GREEN CHOICE® GAS BURNER

• Enhanced Ultra-low NOx burner complies with SCAQMD Rule 1121 and other air quality management districts with similar requirements for NOx emissions of less than 10 ng/J.

DYNACLEAN™ DIFFUSER DIP TUBE

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

COREGARD™ ANODE ROD

• Our anode rods have a stainless steel core that extends the life of the anode rod allowing superior tank protection far longer than standard anode rods.

PUSH-BUTTON PIEZO IGNITOR

• Makes lighting the pilot fast and easy with one-hand push-button spark ignition.

HEAT TRAP NIPPLES

• Factory-installed for faster installation

BLUE DIAMOND® GLASS COATING

• Provides superior corrosion resistance compared to industry standard glass lining.

ENHANCED-FLOW BRASS DRAIN VALVE

• Our residential water heaters have a solid brass, tamper resistant, enhanced-ﬂow, ball type, drain valve.

• Uses a standard female hose ﬁtting that allows for fast and easy draining during maintenance.

• Designed for easy operation, this valve includes an integral screwdriver slot that features a ¼ turn (open/close) radius, which not only permits full straight-through water ﬂow but also a quick and positive shut off.

CODE COMPLIANCE

• Meets UBC, CEC and HUD National Codes.

• Meets the thermal efﬁciency and standby loss requirements of the U.S. Department of Energy and current edition of ASHRAE/IES

90.1.

• Complies with the Federal Energy Conservation Standards effective April 16, 2015, in accordance with the Energy Policy Conservation Act (EPCA), as amended.

CSA CERTIFIED AND ASME RATED T&P RELIEF VALVE

• Top-mounted T&P relief valve available as option.

DESIGN-CERTIFIED BY CSA INTERNATIONAL

• Certiﬁed at 300 PSI test pressure and 150 PSI working pressure. Listed according to ANSI Z21.10.1-CSA 4.1 standards governing storage tank-type gas water heaters.

6-YEAR LIMITED TANK AND PARTS WARRANTY

• For complete information, consult written warranty or go to hotwater.com.

www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015

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AOSRG47001

COMMERCIAL-GRADE

RESIDENTIAL GAS WATER HEATERS

BTU

Model Number

TALL MODELS

GUC-30 30 55 0.63 33,000 34 61-3/4 58 16 12 8 51-3/4 N/A N/A 3 or 4 126

GUC-40 40 71 0.62 40,000 41 62 58-1/4 18 12 8 52 N/A N/A 3 or 4 125

GUR-40 40 71 0.63 40,000 41 62 58-1/4 20 12 8 52 N/A N/A 3 or 4 125

GUC-50 50 91 0.60 40,000 42 60-3/4 57-1/4 20 12 8 50-1/2 N/A N/A 3 or 4 148

GUR-50 50 91 0.62 40,000 42 60-3/4 57-1/4 22 12 8 50-1/2 N/A N/A 3 or 4 148

GURT-50L* 50 98 0.60 50,000 51 61 57-1/2 22 12-1/4 8 50-1/2 12-1/4 50-1/2 4 177

SHORT MODELS

GURL-40 40 69 0.62 40,000 41 51-1/2 47-3/4 22 12 8 41-1/4 N/A N/A 3 or 4 138

All models may be ordered from the factory with top T&P. *Standard with side recirculating taps (model GURT-50L). Most models approved for installation from sea level to 7,700 ft. elevation (except on GURT-50L which is approved to 5,400 ft.). Dimensions and speciﬁcations subject to change without notice in accordance with our policy of continuous product improvement.

Gallon

Capacity

First Hour

Rating Gallon

Energy

Factor

Natural

Input

Gas

Recovery @

90°F Rise

Gallon Per

Hour

A B C D E F G* H*

ANODE ROD

(OPTIONAL T&P

LOCATION)

HOT

CONNECTION

(ANODE OUTLETON

TOP T&P MODELS)

Dimensions in Inches Approx.

Draft Hood

COLD CONNECTION

Shipping

Weight

(lbs)

T&P VALVE

1/2" GAS

CONNECTION

Maximum Hydrostatic Working Pressure: 150 PSI

For technical information call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.

www.hotwater.com | 800-527-1953 Toll-Free USA

AOSRG47001

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