The table below provides a general tank-size estimate one should purchase based on family size and hot water usage.
20-39 gallons |
40-49 gallons |
50-59 gallons |
> 60 gallons* |
|
1-2 people |
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2-4 people |
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3-5 people |
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5+ people |
Table 1: Water heater tank size by family size. *Add 10G per additional person
The table below provides the average flow rates for hot-water-using fixtures.
Sink Faucet |
Bathtub |
Shower |
Dishwasher |
Washing Machine |
|
Average Flow Rate |
1 GPM |
3 GPM |
2.5 GPM |
3 GPM |
3 GPM |
Table 2: Average flow rates of household fixtures in gallons per minute (GPM)