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Gas vs electric water heater
Total cost of ownership for a gas water heater against an electric one, with install price, yearly operating cost, lifespan, and a replacement priced in if you outlive the unit.
X VS Y COMPARISON · CONSTRUCTION · HOME
Gas vs Electric Water Heater
A $1,800 gas water heater at $300 a year to run, versus a $1,500 electric one at $475 a year, over a 12-year horizon. Gas units live about 12 years; electric tanks about 13. Total cost of ownership: $5,400 gas vs $7,200 electric — gas wins by $1,800. Run your own install prices, fuel costs, and horizon below.
The 60-second rule
Total cost of ownership = install + (yearly operating cost × years) + one replacement if you outlive the unit. At the defaults: $5,400 for gas ($1,800 + 12 × $300) against $7,200 for electric ($1,500 + 12 × $475) — gas wins by $1,800. The electric unit starts $300 cheaper to install, but it costs $175 more every year to run, and that gap never closes.
The worked example, line by line
Setup: gas $1,800 install, $300 a year, 12-year life; electric $1,500 install, $475 a year, 13-year life; 12-year horizon.
Gas. $1,800 + (12 × $300) = $5,400. The horizon equals the lifespan exactly, so no replacement is priced in — it gets replaced just as you hit year 12.
Electric. $1,500 + (12 × $475) = $7,200. The 13-year lifespan also survives the 12-year horizon, so no replacement here either.
The verdict: gas wins by $1,800. The $300 install edge for electric is wiped out in the first two years of operating costs ($175 a year × 2 = $350), and the other ten years are pure fuel-price advantage for gas.
Branch — expensive gas, cheap electricity ($450 gas vs $350 electric a year): gas TCO = $1,800 + (12 × $450) = $7,200; electric TCO = $1,500 + (12 × $350) = $5,700. Electric wins by $1,500. In regions with pricey gas and cheap electricity, the fuel math flips entirely — always price your own utility rates.
Branch — 20-year stay: gas = $1,800 + (20 × $300) + $1,800 replacement = $9,600; electric = $1,500 + (20 × $475) + $1,500 replacement = $12,500. Gas wins by $2,900. Both sides need a new unit, but twenty years of the $175-a-year fuel gap stretches the lead from $1,800 to $2,900.
The third option. Heat-pump (hybrid) electric water heaters use roughly a third of the electricity of a standard electric tank, running about $200–$300 a year. They cost more up front, but at those operating numbers they can undercut both sides here — get a quote before you buy a plain tank.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Gas TCO | install + annual × horizon (+ install if horizon > lifespan) | $5,400.00 at the defaults — the whole 12 years of the gas tank in one number. |
| Electric TCO | install + annual × horizon (+ install if horizon > lifespan) | $7,200.00 at the defaults. |
| TCO gap | gas TCO − electric TCO | −$1,800.00 → gas wins. A positive gap means electric wins. |
| Annual operating gap | electric annual − gas annual | $175.00/yr at the defaults — what the electric tank costs extra every single year. |
| Replacement rule | if horizon > lifespan, add one install | Only one replacement is modeled, priced at today’s install cost — a second replacement inside the horizon is rare enough to skip. |
Who uses this
- The “tank just died” homeowner: water on the garage floor and two quotes in hand — plug the real numbers in and the answer is instant.
- The new-build chooser: deciding whether running a gas line is worth it at all — a $1,800 win over 12 years has to beat the gas-line cost first.
- The landlord: replacing tanks across several rentals, where a $175-a-year gap per unit multiplies into real money fast.
- The solar-home owner: cheap daytime electricity can push your electric operating cost well under $475 a year — re-run with your real rate, because that flips branches like the one above.
Accuracy & limitations
Install prices ($800–$1,500 gas, $600–$1,200 electric) and operating costs ($200–$400 gas, $400–$600 electric a year) are typical U.S. ranges, not quotes — local labor and utility rates move them. Electric tanks are 90–95% efficient and gas tanks roughly 60–70%, but electricity costs about 3× as much per unit of heat as natural gas, which is why the efficiency edge loses. What this skips: gas-line installation (if your home has no gas line, add thousands to the gas side), maintenance and repairs, utility rate changes, and venting complications (power-vent or direct-vent units cost more). Price your own quotes and re-run.
Cite this calculatorBright Side Kit. “Gas vs Electric Water Heater.” brightoolbox.com, 2026.
Bright Side Kit. "Gas vs Electric Water Heater." https://brightoolbox.com/gas-vs-electric-water-heater/ Accessed October 23, 2026.Frequently asked questions
Is a gas or electric water heater cheaper to run?
Gas, at typical rates. About $300 a year for gas vs $475 a year for electric — a $175-a-year gap in gas’s favor.
Which costs less over its whole life?
At the defaults, gas: $1,800 installed + 12 years at $300 a year = $5,400, against $7,200 for electric. Gas wins by $1,800.
Why does electric cost more to run if it is more efficient?
Electric tanks are 90–95% efficient and gas tanks only about 60–70%, but electricity costs roughly 3 times as much per unit of heat as natural gas. The efficiency edge loses to the fuel price.
Which water heater lasts longer?
Electric, slightly: gas tanks last about 8–12 years, electric tanks about 10–15. That extra couple of years is real, but it is worth far less than the yearly fuel gap.
What about heat-pump water heaters?
They are the third option worth pricing: about $200–$300 a year to run, using roughly a third of the electricity of a standard electric tank. They cost more up front, but can undercut both gas and plain electric.
Can electric ever win?
Yes — where gas is pricey and electricity is cheap. At $450 a year for gas and $350 for electric, the electric tank wins by $1,500 over 12 years. Re-run the calculator with your own utility rates.