Water Heater Sizing Calculator

Water Heater Sizing

Determine the right water heater size for your household based on number of occupants, usage patterns, and fixture count to ensure adequate hot water supply.

Number of Occupants

Number of Bathrooms

Heater Type

Usage Level

Formula

Daily Usage = Occupants x Gallons Per Person; First Hour Rating = Daily Usage x 0.7; Peak GPM = Bathrooms x 2.0 + 1.0; Tank Size = Based on FHR (40-80 gallons)

Frequently Asked Questions

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