Water heater manufacturers specify water heater sizes by which unit?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

Water heater manufacturers specify water heater sizes by which unit?

Explanation:
Water heater capacity is described by the amount of stored water, and in the United States that storage is specified in gallons. This reflects how much hot water the tank can hold at once before the heater needs to reheat, which is the practical measure plumbers use when sizing systems for a home. Other units don’t fit the concept of storage volume: quarts would imply a much smaller, impractical size for typical residential tanks; liters are used in metric markets but most US manufacturers label capacity in gallons; pounds measures weight, not the amount of water stored. So, gallons is the standard unit for indicating water heater size.

Water heater capacity is described by the amount of stored water, and in the United States that storage is specified in gallons. This reflects how much hot water the tank can hold at once before the heater needs to reheat, which is the practical measure plumbers use when sizing systems for a home. Other units don’t fit the concept of storage volume: quarts would imply a much smaller, impractical size for typical residential tanks; liters are used in metric markets but most US manufacturers label capacity in gallons; pounds measures weight, not the amount of water stored. So, gallons is the standard unit for indicating water heater size.

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