Tank ·
What Size Water Heater Do I Need? 40 vs 50 vs 75 Gallon Explained
Buy too small and you run out of hot water. Buy too big and you waste energy. Here is how to pick the right tank size.
Key takeaways
- 40 gallon: 1 to 3 people. 50 gallon: 3 to 5 people. 75 gallon: 5+ people or big tubs.
- The first-hour rating matters more than tank size.
- Tankless solves sizing for households that run out often.
Tank size is the most common question we get when helping homeowners choose a new water heater.
Size by household
- 1 to 3 people: 40 gallon.
- 3 to 5 people: 50 gallon.
- 5+ people, soaking tubs or teens: 75 gallon or tankless.
Look at the first-hour rating
The first-hour rating (FHR) on the yellow label tells you how much hot water the unit can deliver in an hour of heavy use. Match it to your busiest hour.
Space and code limits
A larger tank needs space, strapping and sometimes a bigger vent. We confirm it fits before we quote it.
Get the right size the first time
Not sure? We will size it for you over the phone. Call HOTCO at (916) 905-4468. We answer 24/7 and serve Roseville, Rocklin, Lincoln, Granite Bay, Folsom, Sacramento and the rest of Placer and Sacramento Counties.
Frequently asked questions
- Is a 40 gallon water heater enough for a family of 4?
- Often it is tight. Most families of four do better with a 50 gallon tank.
- Can I switch from 40 to 50 gallons?
- Usually, yes, if the space and venting allow. We check this before installation.
