Quick answer: Replacing a standard tank water heater costs about $1,200–$2,500 installed (unit $400–$900 + labor $600–$1,500). Tankless runs $2,500–$5,000+ installed. The unit itself is cheaper than the install — most of the cost is labor, permits, and code upgrades. This is one job where a licensed plumber is usually worth it (gas/water/venting), but knowing the numbers keeps you from overpaying.
On an electric heater, a dead element is the usual culprit — see which element failed and what to buy.
Before you price it out, size the unit first — the right capacity is what drives the cost.
Cost by Type
| Type | Unit | Installed (total) |
|---|---|---|
| Tank (gas/electric, 40–50 gal) | $400–$900 | $1,200–$2,500 |
| Tankless (gas) | $1,000–$2,000 | $2,500–$5,000+ |
| Heat-pump (hybrid) | $1,500–$2,500 | $2,500–$4,500 |
What the 2026 Cost Data Says
The table above is what a real quote tends to look like. It is worth cross-checking against published cost data, which runs lower — those figures average in a lot of straightforward like-for-like swaps, and plenty of jobs that needed no code work at all.
- Angi (2026) puts water heater replacement at about $1,340 on average, in a typical range of $882–$1,817. Note: Angi localises its cost pages, and this figure is the one it reports for the Atlanta metro — useful here, but not a national number.
- HomeGuide (2026) lists $600–$3,000 installed for a 40-gallon and $700–$3,100 for a 50-gallon.
- NerdWallet (2026) puts a tank-style replacement at $600–$2,500, and a tankless at $1,400–$3,900.
- Labor typically runs $300–$1,200, and both NerdWallet and Today’s Homeowner note it accounts for over half the total cost of the job.
That last figure is the one worth sitting with. Nobody is really buying a tank here — they are buying the two to four hours it takes to pull the old unit, set the new one, tie it in correctly and get it past inspection. Which is usually why the cheapest quote on the pile is the one leaving something out.
What Drives the Price
Labor and local rates, whether gas/venting or electrical needs upgrading to meet code, permit fees, and removal of the old unit. Switching from tank to tankless costs more because of gas-line and venting changes.
Tank vs Tankless: Is Tankless Worth It?
Tankless lasts longer (~20 years vs ~10–12), saves space, and gives endless hot water, but costs more upfront. For a straight replacement on a budget, a quality tank is the value pick. For a long-term home, tankless can pay back over time.
Should You DIY It?
Usually no — water heaters involve gas, venting, or 240V wiring and a permit in most areas. This is the kind of job our water guide flags for a pro. Where you save is buying smart and getting 2–3 quotes.
What’s Actually in the Quote
The most common reason two bids on the same house differ by several hundred dollars is that they don’t cover the same work. Before you compare numbers, get both plumbers to itemize it. A bid that arrives as one figure is a bid you can’t check.
| Line item | Usually included? | Why it matters |
|---|---|---|
| The heater itself | Yes | The smallest part of the bill on most jobs |
| Removing and hauling away the old unit | Usually | Some shops bill the disposal fee separately |
| New shutoff valve and flex connectors | Usually | Old gate valves rarely survive the swap |
| Permit and inspection | Often not | If it’s missing, ask why |
| Code upgrades (expansion tank, pan, venting) | Often not | This is where the range widens |
| Drywall or trim repair after access | Rarely | Usually a different trade entirely |
Ask for the model number too, not just the capacity. “50-gallon gas heater” covers a builder-grade tank at the bottom of the unit range and a better-built one near the top — different anode, different warranty — and the labor is identical either way.
Deciding which brand to ask for in the first place? A.O. Smith vs Rheem water heaters covers where the two differ and where they do not.
The Code Upgrades That Move Your Price
This is the part that surprises people. A replacement has to meet current code, not the code in force whenever the old heater went in. The inspector doesn’t care that the old setup ran fine for fourteen years. Depending on your jurisdiction and what’s already there, any of these can get added to the job:
- Thermal expansion tank. If the house has a pressure-reducing valve or a backflow preventer — most newer ones do — the plumbing is a closed system and heated water has nowhere to expand. Cheap part, but it adds fittings and time.
- Drain pan and drain line. Required where a leak would damage the structure: attics, upper floors, finished space. Running a new pan drain to somewhere safe is the expensive version.
- T&P discharge piping. The temperature-and-pressure relief line has to be full size, run downhill to a safe termination, and end unthreaded. Older installs get this wrong constantly.
- Gas work. A sediment trap on the gas line, correct venting, and enough combustion air. Going from tank to tankless usually means a larger gas line and all-new venting — that is most of the price gap between the two.
- Electrical. Electric and heat-pump units may need a different breaker or heavier wire than what’s already run.
- Garage installs. A gas heater in a garage generally needs its ignition source raised off the floor.
- Seismic strapping. Standard in earthquake country, not used at all across most of the rest of the country.
None of that is padding — it’s the difference between an install that passes and one that gets red-tagged. But you should see each item written down, and you should be told which ones your inspector will actually enforce. That varies between neighboring cities more than most people expect.
Planned Beats Emergency, Every Time
A tank replaced on a Tuesday because it turned twelve costs the numbers above. The same tank replaced on a Sunday night because it let go costs more: after-hours labor, whatever unit is on the truck rather than the one you’d have chosen, and often water damage on top of the install. If yours is past ten years, collecting quotes now is the cheapest thing you can do about it.
Two things worth settling before you sign:
- Who pulls the permit, and is the inspection included? If a plumber offers to skip it, understand that the unpermitted work attaches to your house at resale, not to their business.
- What is the labor warranty, separately from the manufacturer’s warranty on the tank? A six-year tank behind a ninety-day labor warranty is not a six-year job.
FAQ
How long does a water heater last?
A tank heater lasts about 10–12 years; tankless can last 20+. If yours is over 10 years and leaking from the tank, replace it.
Not sure the tank is the culprit yet? Diagnose the real source first in water heater leaking from the bottom.
Is it cheaper to repair or replace a water heater?
If it’s under ~8 years and the issue is a part (element, thermostat, valve), repair. If it’s old or leaking from the tank itself, replace.
Can I install a water heater myself?
Most homeowners shouldn’t — it involves gas, venting, or 240V wiring and usually a permit. Hire a licensed plumber for safety and code compliance.
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