Water heater replacement cost per gallon (2026)
US-average water heater replacement pricing per gallon of tank capacity, broken out by variant. Multiply by your project size for a total, or use the calculator below.
| Variant | Low per gallon | Typical per gallon | High per gallon |
|---|---|---|---|
Tank, natural gas The default replacement. 8 to 12 year lifespan. | $32 | $48 | $78 |
Tank, electric Cheaper to install, more expensive to run. | $28 | $42 | $69 |
Tankless, natural gas Endless hot water. Needs venting and a larger gas line. | $77 | $115 | $187 |
Tankless, electric Point-of-use friendly. Whole-home models need a 200 amp panel. | $58 | $86 | $140 |
Heat pump water heater 60 to 70 percent lower operating cost. Eligible for federal credit. | $83 | $125 | $203 |
National averages. State and metro multipliers shift these 12 to 55% in either direction.
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US national averageAdjust the variant and size. Numbers update live.
40 gallon for 1 to 2 people, 50 gallon for 3 to 4, 75 gallon or tankless for 5 plus.
- Variant
- Tank, electric
- Size
- 50 gal
- Region factor
- 1.00x
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Frequently asked questions
How long does a water heater replacement take?+
A like-for-like tank swap takes two to four hours. Tankless conversions, location moves, or fuel changes extend the job to a full day or more.
Should I switch from tank to tankless?+
Yes if you have natural gas, hot water demand at multiple fixtures, and plan to stay in the home five plus years. Otherwise the payback period exceeds the unit lifespan.
How long does a water heater last?+
Tank: 8 to 12 years (electric often lasts longer than gas). Tankless: 15 to 20 years. Heat pump: 10 to 15 years. Annual flushing extends life materially.
Do I need a permit to replace a water heater?+
Yes in most US cities. Skipping the permit voids the manufacturer warranty in many cases and can flag at home sale inspection.
Can I install a water heater myself?+
Legal in some jurisdictions for like-for-like electric tank swaps. Gas, tankless, and heat pump installs require licensed plumbers and inspections almost everywhere.