Mixing Valves

TYPICAL INSTALLATION

MIXING VALVE / THERMAL EXPANSION TANK USAGE AND SPACE HEATING

FIGURE 2.

Mixing valves are available at plumbing supply stores. Consult a Qualified Installer or ServiceAgency. Follow mixing valve manufacturer’s instructions for installation of the valves.

DANGER

Water temperature over 125°F (52°C) can cause severe burns instantly resulting in severe injury or death.

Children, the elderly and the physically or mentally disabled are at highest risk for scald injury.

Feel water before bathing or showering.

Temperature limiting devices such as mixing valves must be installed when required by codes and to ensure safe temperatures at fixtures.

	TABLE 1.
Water Temperature		Time to Produce 2nd & 3rd
Water Temperature		Degree Burns on Adult Skin
		Degree Burns on Adult Skin
180°F (82°C)		Nearly instantaneous

170°F (77°C)		Nearly instantaneous
160°F (71°C)		About 1/2 second
150°F (66°C)		About 1-1/2 seconds
140°F (60°C)		Less than 5 seconds
130°F (54°C)		About 30 seconds
120°F (49°C)		More than 5 minutes

Water heated to a temperature which will satisfy clothes washing, dish washing, and other sanitizing needs can scald and cause permanent injury upon contact. Short repeated heating cycles caused by small hot water uses can cause temperatures at the point of use to exceed the water heater’s temperature setting by up to 20°F (11°C).

Some people are more likely to be permanently injured by hot water

than others. These include the elderly, children, the infirm and the

physically/mentally disabled. Table 1 shows the approximate time- to-burn relationship for normal adult skin. If anyone using hot water

provided by the water heater being installed fits into one of these

groups or if there is a local code or state law requiring a certain water temperature at the point of use, then special precautions must be taken.

In addition to using lowest possible temperature setting that satisfies demand

of application a Mixing Valve should be installed at water heater (see Figure 3) or at hot water taps to further reduce system water temperature.

		HOT WATER
		OUTLET


			12” TO 15”
TEMPERED WATER			(30-38 cm)
TEMPERED WATER
	OUTLET
COLD			CHECK
WATER			VALVE
INLET			MIXING
		CHECK	MIXING
		CHECK	VALVE
		VALVE	VALVE
		VALVE

TO TANK

INLET

FIGURE 3.

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