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

COMMERCIAL-GRADE

RESIDENTIAL GAS WATER HEATERS

PROLINE® ULTRA-LOW NOx

COMMERCIAL-GRADE RESIDENTIAL

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.

©February 2017 A. O. Smith Corporation. All rights reserved.	Page 1 of 2
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015	AOSRG47001