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Determining the Right Size for a Tankless Water Heater

tankless water heater

Tankless water heaters consist of either an electric element or a gas burner that heats flowing water and does not have a storage tank. Tankless water heater is also called on-demand, point-of-use or instantaneous because it heats water only when it is needed and eliminates continuous standby losses. A tankless water heater is usually more energy-efficient than a storage tank water heater.

You can choose your preferred tankless water heater from Rheem, Ecosmart, Navien and Rinnai brands.

With tankless or on demand water heaters, proper sizing is very important.

Manufacturers rate the delivery of hot water in gpm. The water heater capacity for delivering hot water is rated by the continuous flow in gallons per minute (gpm) of hot water that they can provide, using standard water inlet and outlet conditions.

To calculate the right size for your tankless water heater, you should consider how many users will be demanding hot water at the same time. If you expect to use hot water by different appliances at the same time, these demands must be added, and the water heater must be able to meet these peak loads. You may decide to schedule water heating usage and that is fine as long as everyone understands the availability of hot water.

Note that the capacities for delivering hot water that are quoted by manufacturers for both storage tank units and tankless units are based on raising the water temperature by a fixed amount. The temperature of the incoming water varies greatly by geographical location and time of year.

Choosing the right tankless water heater is an important decision that should be taken seriously. Call Aire One at 310-4328 or contact Aire One local office near you:

Save on your energy bills while you enjoy an endless flow of hot water when you need it!

Tankless water heaters are more energy-efficient, because water is heated quickly and only when it’s needed. In fact, tankless condensing models start at an energy factor of 0.94, which means 94% of the fuel is being used to heat the water and only 6% is wasted. This means that Navien and Rinnai tankless water heaters can lower your energy bill.


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