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How Long Does a Water Heater Last?

Most tank water heaters last 10 to 15 years, and tankless units can last more than 20 years, according to the U.S. Department of Energy. Hard water, sediment, high pressure and a used-up anode rod shorten that. DOE suggests shopping for a replacement once a tank is more than 7 years old, so you can choose one before the old one fails.

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What is the lifespan of a water heater?

DOE's Energy Saver guide says most storage water heaters last 10 to 15 years, while tankless water heaters can last more than 20. A water heater sizing tool from Pacific Northwest National Laboratory, built with DOE funding, assumes an average storage water heater life of 13 years. HomeGuide notes that electric tanks tend to last 2 to 3 years longer than gas tanks.

  • Gas or electric storage tank: 10 to 15 years (DOE).
  • Tankless, gas or electric: more than 20 years (DOE).
  • Heat pump water heater: it has a storage tank, so tank corrosion still limits its life; DOE does not publish a separate figure.

What shortens a water heater's life?

Most tanks fail from the inside out. These are the main culprits, and most can be slowed with maintenance.

  • Sediment: minerals settle on the tank bottom, and DOE says sediment impedes heat transfer and lowers efficiency. Draining a quart every 3 months helps.
  • Hard water: scale builds faster on harder well water, and in tankless units it restricts flow and can shorten the unit's life, according to a DOE guide.
  • High pressure: heated water expands, and in a closed system without a thermal expansion tank that pressure strains the tank and relief valve. California's plumbing code requires an expansion tank where a check valve or backflow preventer closes the system.
  • A used-up anode rod: the rod corrodes so the tank doesn't. HomeGuide says plumbers recommend replacing it every 3 to 5 years.

How can I tell how old my water heater is?

Look at the rating plate on the side of the tank. It lists the model and serial number, and most manufacturers encode the manufacture date in the serial number; the manufacturer's website or support line can decode it. Some installers also write the date on the tank, and your city or county may have the permit record from the last replacement.

If your home was built in the 2000s or early 2010s and the tank has never been replaced, it is now roughly 11 to 26 years old, which puts it at or past DOE's typical range.

What are the signs a water heater is near the end?

Age is the biggest clue, but these signs suggest a tank is wearing out.

  • Water around the base that is not coming from a fitting or valve.
  • Rust-colored hot water, or rust at the fittings.
  • Rumbling or popping from sediment, and slower heating.
  • Repeated repairs, such as elements or thermocouples, within a short time.
  • Less hot water than the tank used to deliver.

Should I replace my water heater before it fails?

If it is past 10 years old, planning ahead usually pays. DOE suggests starting to shop once a tank is more than 7 years old so you can research a replacement before the old one fails. ENERGY STAR makes the same point for heat pump water heaters: your installer may need time to order the right model, and the install may take longer than a standard tank.

Planning also gives you time to use rebates. In 2026 SMUD offers up to $4,000 for replacing a gas water heater with a qualifying heat pump model, and Roseville Electric offers up to $2,500. A tank that fails on a weekend tends to get replaced with whatever is in stock.

A failed tank can also do real damage. Where a water heater sits in an attic or over a finished ceiling or floor, California's plumbing code calls for a drain pan at least 1.5 inches deep with a 3/4-inch drain, but many leaks start on the floor of a garage or closet and spread from there.

How long do water heaters last in Sacramento-area homes?

No agency publishes a Sacramento-specific lifespan figure, so DOE's 10-to-15-year range is the best guide. Local conditions push in both directions. Homes on soft surface water, like El Dorado Irrigation District's 13 mg/L average or Folsom's 26.5, put less mineral load on a tank. Homes on harder well water, such as Elk Grove Water District Service Area 1 at a 141 mg/L average, build sediment faster and benefit more from regular flushing. If you are unsure, call (916) 712-7030 and ask a local plumber to look at your tank's age and condition.

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Frequently asked questions

Is a 15-year-old water heater worth repairing?
Rarely, except for a small, cheap fix. Fifteen years is the top of DOE's 10-to-15-year range for storage tanks, so the tank itself is likely near failure. Spending $100 to $325 on a thermocouple may buy time, but a leak from the tank body cannot be repaired. Get a replacement quote at the same visit.
Do tankless water heaters really last longer?
DOE says tankless water heaters can last more than 20 years, compared with 10 to 15 for most tanks. They avoid the tank corrosion that ends most storage water heaters. Their life still depends on descaling, which a DOE guide says may be needed from twice a year to once every three years, depending on water quality.
Does water hardness affect how long a water heater lasts?
It affects how fast sediment and scale build up. DOE notes sediment lowers a tank's efficiency, and a DOE guide says scale in tankless heat exchangers restricts flow and can shorten the unit's life. Sacramento-area water ranges from soft lake water to well water above 200 mg/L, so check your supplier's water quality report.

Available across the Sacramento area

Sources

  1. Energy Saver Guide: Tips on Saving Money and Energy in Your Home (2022) — U.S. Department of Energy
  2. Energy Savers: Tips on Saving Money and Energy at Home — U.S. Department of Energy
  3. DHW First Hour Rating tool — Building America Solution Center (Pacific Northwest National Laboratory, DOE)
  4. Water heater installation: permits, timing, gas vs electric (FAQ) — HomeGuide
  5. How much does water heater repair cost? (2025–2026) — HomeGuide
  6. Measure Guideline: Transitioning to a Tankless Water Heater (Building America, 2012) — U.S. Department of Energy / IBACOS
  7. New and Replacement Water Heater Installations: Selected excerpts from the California Plumbing Code — San Bernardino County Land Use Services, Building and Safety Division
  8. Water Heater Installations (California Plumbing Code excerpts, incl. CPC 507.5 drainage pan) — City of Yorba Linda Building & Safety
  9. Heat Pump Water Heaters — ENERGY STAR
  10. Appliance rebates: heat pump water heater (rebate table, program requirements, median installation costs) — SMUD
  11. Heat Pump Water Heater rebate — Roseville Electric Utility, City of Roseville
  12. 2025 Water Quality Report (Main System) — El Dorado Irrigation District
  13. 2025 Water Quality Report — City of Folsom
  14. 2025 Consumer Confidence Report — Elk Grove Water District
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