Sizing Guide
The Charts below provides minimum sizing recommendations, expressed according to the number of people living in the home, taking an automatic dishwasher and clothes washing machine into account. The following factors should make you consider selecting a larger or higher-input water heater.
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1.
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More than two full baths in the home. |
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2.
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Teenagers living in the home. Because teenagers use more hot water for showering and washing clothes, we advise you to consider each teenager as two people. |
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3.
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An oversize whirlpool bath or large bathtub. As a rule of thumb, the water heater tank capacity should be at least 2/3 that of the bathtub. (example: 75-gallon tub/50-gallon water heater. |
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Gas Water Heaters - Number of People
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INPUT
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Water Heater Capacity (in Gallons)
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Btu/Hr
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30
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40
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50
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75
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100
|
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30,000
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1
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2-3
|
|
|
|
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32,000
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1
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2-3
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3-5
|
|
|
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33,000-
33,500
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1
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3
|
|
|
|
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35,500-
36,000
|
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3-4
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4-5
|
|
|
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37,000-
40,000
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2-3
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4-5
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5-6
|
|
|
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48,000-
50,000
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5-6
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5-6
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|
|
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52,500
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5-6
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6-7
|
|
|
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75,100
|
|
|
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7+
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8+
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Electric Water Heaters - Number of People
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INPUT
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Water Heater Capacity (in Gallons)
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Watts/Hr
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30
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40
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50
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66
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82
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120
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|
3800
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1
|
|
|
|
|
|
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4500
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1
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2-3
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3-4
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4-5
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5-6
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6-8
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5500
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2
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2-3
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3-4
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4-5
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5-6
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6-8
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IMPORTANT! - TO HELP PREVENT SCALDING
These sizing recommendations are also based on maximum delivered hot water temperature of 120°F, which corresponds approximately to the "HOT" setting on gas water heater thermostats. Reliance recommends that the thermostat be kept at that setting, to greatly reduce the danger of tap water scald burns.
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