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In sizing for the right model suitable for your application, ask yourself these simple questions:
- How many showers are typically running at the same time during peak shower time?
- Are any other hot-water appliances, like the dishwasher or clothes washer, usually running at the same time?
- Do you live in the South Costal Region, or in a Northern climate where water comes into the house colder and, therefore, needs a bigger boost to come up to shower temperature?
- What is the desired hot water outlet temperature?
A standard shower uses 2.5 gallons of water per minute (GPM)
- Filling a standard bath tub uses ~3.0 GPM
- Running a dishwasher uses ~2.0 GPM
- Filling a clothes washer uses ~2.0 GPM
To calculate your peak demand:
- Figure the number of uses that are used simultaneously during a peak time and add together the total GPM from each use. (For example, if you want to run two standard showers simultaneously, you’ll need 5GPM)
Figure out where you live – in the Sunbelt or a cold Northern climate.
Decide if you need a higher temperature range for your specific hot water uses.
Now, based on that information, decide which tankless water heater will support your peak demand in the middle of the winter.
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