Temperature Regulation

HOT WATER CAN SCALD: Water heaters are intended to produce hot water. Water heated to a temperature that will satisfy space heating, clothes washing, dish washing, and other sanitizing needs can scald and permanently injure you upon contact. Some people are more likely to be permanently injured by hot water than others. These include the elderly, children, the inﬁrm, or physically/mentally handicapped. If anyone using hot water in your home ﬁts into one of these groups or if there is a provincial, state law or local code requiring a speciﬁc hot water temperature at the tap, then you must take special precautions. Never allow small children to use a hot water tap, or to draw their own bath water. Never leave a child or handicapped person unattended in a bathtub or shower.

It is recommended that lower water temperatures be used to avoid the risk of scalding. It is further recommended, in all cases, that the water temperature be set for the lowest temperature that satisﬁes your hot water needs. This will also provide the most energy efﬁcient operation of the water heater.

Figure 28 shows the approximate water temperatures produced at various thermostat dial settings. Short repeated heating cycles caused by small hot water uses can cause temperatures at the point of use to exceed the thermostat setting by up to 17°C (30°F). If you experience this type of use you should consider using lower temperature settings to reduce scald hazards.

Valves for reducing point-of-use temperature by mixing cold and hot water are available (see Figures 2 & 7). Also available are inexpensive devices that attach to faucets to limit hot water temperatures. Contact a licensed plumber or the local plumbing authority.

SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN OFF THE MAIN MANUAL GAS CON- TROL VALVE TO THE APPLIANCE (SEE FIGURE 1).

NOTE: A water temperature range of 49°C-60°C (120°F-140°F) is recommended by most dishwasher manufacturers. The ther- mostat of this water heater has been factory set at its lowest position (PILOT LIGHTING). It is adjustable and must be reset to the desired temperature setting to reduce the risk of scald injury. The mark () indicative of approximately 49°C (120°F) is preferred starting point. Some provinces may have a require- ment for a lower setting.

Turn the water temperature dial clockwise () to decrease the temperature, or counterclockwise () to increase the tempera- ture.

	Temperature Setting	Time to Produce 2nd & 3rd
	Temperature Setting	Degree Burns on Adult Skin
		Degree Burns on Adult Skin

	VERY HOT= approx. 71°C	About 1/2 second
	(160°F)	About 1/2 second
	(160°F)
	C = approx. 66°C (150°F)	About 1-1/2 seconds
	B = approx. 60°C (140°F)	Less than 5 seconds
	A = approx. 55°C (130°F)	About 30 seconds
	= approx. 49°C (120°F)	More than 5 minutes
	LOW = approx. 27°C (80°F)	-----------------------------

FIGURE 28

186589-004, GDVT-50, GDV-75, GDV-40, GDV-50 specifications

A.O. Smith is a recognized name in the water heating industry, known for its reliable and efficient water heaters. Among its notable products are the GDV-50, GDV-40, GDV-75, GDVT-50, and 186589-004 models. These water heaters offer enhanced performance, energy efficiency, and modern technologies suited for residential and commercial applications.

The GDV series includes the GDV-50, GDV-40, and GDV-75 models, which feature a robust design typically made from high-quality materials to ensure longevity. These units come equipped with advanced insulation, which minimizes heat loss and increases efficiency, making them excellent choices for households with varying hot water needs.

The GDV-50 model boasts a tank capacity of 50 gallons, making it suitable for medium to large households. It features a powerful heating element that heats water quickly, providing ample hot water for daily use. Meanwhile, the GDV-40 is designed for smaller households with a 40-gallon capacity. This model strikes a balance between size and efficiency, catering to lighter hot water demands while maintaining excellent performance.

For larger households, the GDV-75 provides a 75-gallon capacity, ensuring that even the most demanding hot water applications can be met with ease. This model is particularly ideal for families that require hot water in large quantities or at peak times.

The GDVT-50 is a versatile model that features advanced technology, such as an integrated digital display that allows users to monitor and adjust settings easily. This offers greater control over temperature settings and energy usage, making it not only convenient but also more energy-efficient.

The A.O. Smith 186589-004 is an accessory designed for specific model enhancements that improve overall performance and safety. It may include additional safety features, such as high-temperature limit switches and automatic shut-off mechanisms that provide peace of mind for users.

All these models are equipped with A.O. Smith’s innovative technologies, including advanced thermostat controls and durable components designed to withstand frequent use. They typically come with generous warranties, underscoring the manufacturer's commitment to quality and customer satisfaction.

In summary, A.O. Smith water heaters, particularly the GDV-50, GDV-40, GDV-75, GDVT-50, and 186589-004, are built for efficiency, reliability, and performance. With various capacities and the latest technologies, they cater to the diverse needs of homeowners and businesses, ensuring that hot water is always available when needed.