The short answer
A standard storage tank is cheapest to install and the right call for a straight replacement on a tight budget. A gas tankless costs more upfront but lasts roughly twice as long and never runs out of hot water. A heat-pump water heater (HPWH) costs more than a basic tank but is by far the cheapest to run, so in an all-electric home with space for it, it usually has the lowest 10-year total cost.
The figures below are planning ranges, not bids — installed cost for a typical single-family replacement, before regional and site-specific variation. Price your exact job with the water heater cost calculator or the tankless water heater calculator, then get two or three local quotes.
| Type | Typical installed cost | Lifespan | Running cost | Best for |
|---|
| Standard tank (gas) | $1,000 – $3,000 | 10 – 15 yrs | Moderate | Lowest upfront; gas homes |
| Standard tank (electric) | $950 – $2,400 | 10 – 15 yrs | High | Lowest upfront; no space for a HPWH |
| Tankless (gas) | $2,500 – $6,500 | 20+ yrs | Low – moderate | Endless hot water; small footprint; long stays |
| Heat-pump (HPWH) | $3,000 – $5,500 | 13 – 18 yrs | Lowest | All-electric homes with a warm, open space |
Standard storage tank: cheapest to install
A storage tank keeps 40–80 gallons hot around the clock. It is the default in most U.S. homes for one reason: a like-for-like swap is the cheapest and fastest job on this list. A basic 40- or 50-gallon gas or electric tank typically installs for $1,000–$3,000, and a plumber can usually do it in a few hours.
The trade-offs are lifespan and standby loss. A tank reheats water continuously to fight "standby" heat loss, and it lasts about 10–15 years — toward the short end in hard water without a softener. An electric resistance tank is inexpensive to buy but expensive to run, because resistance heating converts electricity to heat one-for-one at retail electricity prices.
Pick a tank if: you need a straightforward replacement, you are on a budget, you have natural gas, or the space won't suit a heat pump. Model your exact unit, capacity, and venting in the water heater cost calculator.
Tankless (on-demand): longest life, highest upfront
A tankless heater fires only when you open a tap, so there is no standby loss and no tank to run dry — endless hot water for back-to-back showers. Gas units are the common whole-home choice; electric tankless rarely has the amperage for a whole house in cold climates.
Installed cost typically runs $2,500–$6,500 (more for a condensing model), and the spread is almost entirely about the infrastructure, not the unit. A whole-home gas tankless fires at a high BTU rate and often needs a larger gas line and a dedicated stainless or PVC vent; retrofitting those is the single biggest cost driver. The payoff is longevity: tankless units last 20 years or more, well beyond a tank's 10–15, and the DOE puts their efficiency gain at roughly 8–34% over a gas tank depending on household hot-water use (the gain is largest in low-use homes).
Pick tankless if: you plan to stay long enough to bank the longer life, you want to reclaim the floor space, or you routinely run out of hot water. Budget for the gas-line and venting upgrades, and price them in the tankless water heater calculator.
Heat-pump water heater: cheapest to run
A heat-pump water heater (also called a hybrid) moves heat from the surrounding air into the water instead of generating it directly, the way a refrigerator works in reverse. That makes it the efficiency winner by a wide margin: the DOE rates a HPWH about two to three times more efficient than a standard electric tank, and ENERGY STAR estimates a typical household saves on the order of $300–$550 a year versus electric resistance.
Installed cost is usually $3,000–$5,500 for a 50-gallon unit (more for an 80-gallon) — above a basic tank, but often below a gas tankless retrofit and with far lower running cost. The catches are physical: a HPWH needs a warm, non-freezing space of roughly 1,000 cubic feet (a basement, garage, or utility room) to pull heat from, it produces some cool exhaust air and a little noise, and it needs a condensate drain. In a cramped closet or a freezing space it loses its advantage and falls back on a less-efficient backup element.
Pick a HPWH if: you are all-electric (or electrifying), you have the space and a nearby drain, and you want the lowest monthly running cost. Model it as the heat-pump option in the water heater cost calculator.
Which is cheapest over 10 years?
This is the question that actually matters, and the honest answer is it depends on your fuel and your usage — but the ranking usually shakes out like this:
- All-electric home: the heat-pump water heater typically wins the 10-year total. Its higher purchase price is repaid by running costs a fraction of an electric-resistance tank's, and 10–15 years of life covers the horizon.
- Natural-gas home, low budget: a gas storage tank is hard to beat on total cost if you are not staying long — cheap to install, reasonable to run, and you may replace it once in the period.
- Staying put 15+ years: a gas tankless can come out ahead despite the high install, because it likely outlives two storage tanks and uses less fuel the whole time.
Two numbers swing the result more than anything else: your local energy prices (cheap gas favors gas; cheap electricity or an unfavorable gas rate favors the heat pump) and your hot-water usage (heavy users amplify every efficiency difference). Run your own job both ways in the calculators rather than trusting a generic average.
Federal tax credits (2026)
Through December 31, 2025, the federal Section 25C Energy Efficient Home Improvement Credit covered qualifying high-efficiency water heaters — up to $2,000 for a heat-pump water heater and up to $600 for a qualifying high-efficiency gas unit. That credit applied to property placed in service on or before December 31, 2025.
For installs in 2026, the 25C credit has generally expired under the 2025 budget legislation, so a 2026 water heater generally does not qualify. Tax law changes; confirm the current rule and your eligibility on IRS Form 5695 before counting a credit into your budget. We are not a tax service — check with a tax professional for your situation.
Frequently asked questions
Is a tankless water heater cheaper than a tank?
Not upfront. A standard tank installs for roughly $1,000–$3,000, while a gas tankless usually runs $2,500–$6,500 once venting and gas-line upgrades are included. Tankless can win over its full life because it lasts well beyond a tank and uses less fuel, but the payback depends on your hot-water use and energy prices.
Which water heater is cheapest to run?
A heat-pump water heater (HPWH). The U.S. Department of Energy rates HPWHs about two to three times more efficient than a standard electric-resistance tank, and ENERGY STAR estimates a typical household saves on the order of $300–$550 a year switching from electric resistance to a heat-pump model.
How long does each type of water heater last?
A standard storage tank typically lasts 10–15 years, a heat-pump water heater about 13–18 years, and a tankless unit 20 years or more with descaling. Lifespan falls in hard-water areas without softening or annual flushing.
Do tankless water heaters need a bigger gas line?
Often yes. A whole-home gas tankless fires at a high BTU rate and frequently needs a larger-diameter gas line and a dedicated stainless or PVC vent. Those upgrades are the main reason a tankless install costs more than a tank swap, so confirm them in any quote.
Are there federal tax credits for water heaters in 2026?
The Section 25C Energy Efficient Home Improvement Credit, which covered qualifying heat-pump water heaters (up to $2,000) and high-efficiency gas units (up to $600), applied to property placed in service on or before December 31, 2025. For installs in 2026 the credit has generally expired; verify current law on IRS Form 5695 before counting on it.
Is a heat-pump water heater worth it?
In an all-electric home with a warm, non-freezing space of roughly 1,000 cubic feet (a basement, garage, or utility room), a heat-pump water heater usually has the lowest 10-year total cost because its running cost is so low. It is a weaker fit for small closets, cold unconditioned spaces, or homes with cheap natural gas.
How to decide
- Need a fast, cheap replacement? Standard tank in your existing fuel type.
- All-electric with a basement/garage and a drain? Heat-pump water heater — lowest running cost.
- Want endless hot water or your floor space back, and staying put? Gas tankless — budget for the gas-line and vent upgrades.
- Small closet, cold space, or cheap natural gas? A gas tank is usually the pragmatic pick.
Whatever you lean toward, price the exact unit and capacity for your home, then check any contractor quote against the band with the built-in bid check on each calculator:
Water heater cost calculator → Tankless water heater calculator →
