service, contact your dealer or utility company. Refer to TEMPERATURE REGULATION section.

4.The storage capacity of the heater may have been exceeded by large demands of hot water.

5.If the heater was installed when incoming water temperatures were warm, colder incoming temperatures will create the effect of less hot water.

6.Look for leaking or open hot water faucets.

WATER IS TOO HOT

1. Refer to TEMPERATURE REGULATION section.

WATER HEATER MAKES SOUNDS

1. See MAINTENANCE

WATER LEAKAGE IS SUSPECTED

1.Check to see if the heater drain valve is tightly closed.

2.The apparent leakage may be condensation which forms on cool surfaces of the heater and piping.

3.If the outlet of the relief valve is leaking it may represent:

•Excessive water pressure.

•Excessive water temperature.

•Faulty relief valve.

Excessive water pressure is the most common cause of relief valve leakage. It is often caused by a “closed system”. A check valve in the inlet system will not permit the expanded hot water volume to equalize pressure with the main. A relief valve must release this water or the water heater or plumbing system will be damaged.

When such a condition is encountered, local codes or inspection agency should be consulted to determine which system is acceptable in your area. These may consist of:

•Installation of a second relief valve with lower setting than the primary safety relief valve.

•An expansion tank of suitable pressure and provision to avoid water logging.

•Removal of the check valve.

IF YOU CANNOT IDENTIFY OR CORRECT

THE SOURCE OF THE MALFUNCTION

1.Place the water heater electrical switch in the OFF position.

2.Close the cold water inlet valve to the heater.

3.Contact your dealer.

NOTES

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A.O. Smith DEL, DEN warranty Water is TOO HOT, Water Heater Makes Sounds, Water Leakage is Suspected
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DEN, DEL specifications

A.O. Smith is a well-respected name in the water heating industry, known for its innovative and efficient products. Among their notable offerings are the A.O. Smith DEN and DEL models, which showcase advanced features and technologies designed for residential hot water needs.

The A.O. Smith DEN series is a line of electric tank water heaters that exemplify reliability and performance. One of its main features is the "Eco-friendly" design that meets stringent regulatory standards while providing exceptional energy efficiency. The DEN models are equipped with a variety of capacities, allowing homeowners to choose a unit that best fits their needs, ranging from smaller households to larger family homes.

The DEL series, on the other hand, offers gas-fired water heaters that are built to provide high recovery rates, ensuring that hot water is available whenever needed. The DEL models are equipped with a high-efficiency burner system that enhances fuel utilization, reducing energy costs for homeowners. The robust construction of the DEL series also ensures durability and longevity, making it an excellent investment for those seeking reliable hot water solutions.

Both the DEN and DEL series feature user-friendly digital displays, making it easy for users to monitor temperature settings and energy usage. This technological integration empowers homeowners to manage their hot water needs more effectively, leading to both convenience and savings.

In terms of safety, A.O. Smith has incorporated features such as temperature and pressure relief valves in both series to prevent overheating and excessive pressure buildup. This focus on safety is paramount, providing peace of mind for users.

Moreover, the DEN and DEL models come with comprehensive warranties, reflecting the company's commitment to quality. Homeowners can rest assured that they are investing in products that are not only efficient but also backed by a trusted manufacturer with decades of experience.

In summary, the A.O. Smith DEN and DEL series represent a harmonious blend of advanced technology, energy efficiency, and user-centric features. With their focus on performance and safety, these models stand out as exemplary choices for anyone in need of reliable and efficient hot water solutions. Whether for electric or gas applications, A.O. Smith continues to lead the way in the water heating industry.
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