Sizing a Water Heater

A properly sized water heater will meet your household's hot water needs while operating more efficiently. Therefore, before purchasing a water heater, make sure it's the correct size.

Here you'll find information about how to size these systems:

• Demand (tankless or instantaneous) water heaters
• Solar water heating system
• Storage and heat pump (with tank) water heaters.

For sizing combination water and space heating systems—including some heat pump systems, and tankless coil and indirect water heaters—consult a qualified contractor.

Don't choose a water heater model based solely on its size. You also need to consider the following:

• Fuel type and availability
• Energy efficiency
• Costs.

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