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hot-water storage tank
A tank that meets code requirements for storing hot water. These requirements depend on its size and pressure as well as the authority having jurisdiction. The volume of the tank usually is selected so that 60 to 80 percent of the volume of water in the tank may be drawn off before the temperature drop of the water in the tank is unacceptable.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.