What Size Water Heater Do I Need?
A quick peak-demand estimate that suggests a tank size in gallons and the configuration — standard, tall, or short/lowboy — that fits your space.
Most households land near 40-55 gallons: 1-2 people often fit 30-40, 3-4 people 40-50, and 5+ people 55-80, with heavy back-to-back use pushing the size up.
Why this matters
Use this before replacing a water heater so the conversation starts with real peak demand and fit instead of just matching the old tank's size.
The public-safe rule
This page gives an educational planning result. Final quote, rebate, payment, package, and installer details wait until the customer and home record are saved inside the assessment flow.
Start exact assessmentRun the numbers.
Plan around a 40-gallon water heater
For 3 people with typical peak use, a 40-50 gal tank is a sensible planning size.
Recommended size
40 gal
Planning range
40-50 gal
Est. peak-hour demand
33 gal
Suggested configuration
standard or tall
Sizing follows peak-hour demand — the hot water used in your busiest hour — not just household count. The final size also accounts for the install space and the unit's recovery rate.
An electric tank fits the widest range of spaces, including tight closets.
Confirm the exact size, configuration, and fit during the intake — the space and your real peak demand drive the final pick.
This is a planning estimate, not a final quote or engineering report. Field conditions, permits, equipment selection, ducts, electrical work, and installer verification can change the result.
How this estimate is grounded.
The visible result, assumptions, and schema match. Structured data does not claim anything that is not also shown on the page.