Storage water heater

^{[citation needed]}A storage water heater, or a hot water system (HWS), is a domestic water heating appliance that uses a hot water storage tank to maximize water heating capacity and provide instantaneous delivery of hot water.^[1] Conventional storage water heaters use a variety of fuels, including natural gas, propane, fuel oil, and electricity. Less conventional water heating technologies, such as heat pump water heaters and solar water heaters, can also be categorized as storage water heaters.

^ Hoeschele, M.; Springer, D.; German, A.; Staller, J.; Zhang, Y. (April 2015). Strategy Guideline: Proper Water Heater Selection (PDF) (Report). United States Department of Energy. Archived (PDF) from the original on May 17, 2021. Retrieved May 17, 2021.

[selectionguide-1] Hoeschele, M.; Springer, D.; German, A.; Staller, J.; Zhang, Y. (April 2015). Strategy Guideline: Proper Water Heater Selection (PDF) (Report). United States Department of Energy. Archived (PDF) from the original on May 17, 2021. Retrieved May 17, 2021.

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