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L 502.2 Water Heaters and Storage Tanks
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Residential-type water heaters, pool heaters, and unfired water heater storage tanks shall comply with the minimum performance requirements specified by federal law.
Unfired storage water heating equipment shall have a heat loss through the tank surface area of less than 6.5 British thermal units per square foot hour [Btu/(ft2•h)] (20.5 W/m2). [ASHRAE 90.2-2007:7.1]
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