Water Heater Replacement Cost
What a new heater costs installed, and what moves the number.
By Jonathan West · reviewed 2026-09-14 ·how we research these
Replacing a water heater is one of the few household purchases people make under time pressure. The old one has failed, there is water on the floor, and the quote arrives before there is much chance to compare. Knowing the ranges in advance is the difference between a fair price and whatever gets offered.
The unit itself is usually the smaller half of the bill. Labour, permits and whatever the inspector requires bringing up to code frequently cost more than the heater.
Installed Cost by Type
These are all-in figures, unit, labor, standard fittings, disposal of the old heater, for a straightforward like-for-like swap in an accessible location.
| Type | Unit only | Installed | Typical life |
|---|---|---|---|
| Gas storage tank, 40–50 gal | $500–1,200 | $1,200–2,500 | 8–12 yrs |
| Electric storage tank, 40–50 gal | $400–900 | $900–1,800 | 10–15 yrs |
| Gas tankless | $1,000–2,200 | $2,500–5,500 | 15–20 yrs |
| Electric tankless | $500–1,500 | $1,500–3,500 | 15–20 yrs |
| Heat pump / hybrid | $1,500–3,000 | $2,500–5,000 | 13–15 yrs |
| Point-of-use (2.5–10 gal) | $150–400 | $400–900 | 6–10 yrs |
Gas or Electric
The utilities already present at your installation space dictate the choice. Gas units burn natural gas or propane. They require an adequately sized gas supply line run directly to the heater, plus a dedicated venting path to send combustion exhaust outside through an atmospheric chimney flue or a sidewall power vent. Electric units need no venting and produce no combustion exhaust. A standard electric tank requires a dedicated 240-volt electrical circuit. Electric tankless models draw far more power, frequently needing multiple double-pole breakers that can trigger an evaluation of your electrical service panel.
Fuel type also affects indoor safety and reheat speed. Gas equipment burns fuel indoors. A blocked flue, a malfunctioning vent, or a cracked heat exchanger introduces a carbon monoxide risk that an electric unit cannot create. Proper venting and a working carbon monoxide detector are mandatory safety precautions. For performance, gas burners deliver heat much faster than electric heating elements, which lets a gas storage tank recover hot water noticeably faster than a same-sized electric tank. Stick with gas if your home already has an active gas line and an exterior vent. Choose electric if you have an available 240-volt circuit instead.
| Gas | Electric | |
|---|---|---|
| Fuel or energy source | Natural gas or propane | Electricity |
| Venting requirement | Flue into chimney or sidewall vent | None |
| Electrical requirement | None for standard atmospheric tank | Dedicated 240V circuit |
| Carbon monoxide risk | Possible if vent or flue fails | None |
| Typical recovery speed | Faster | Slower |
Size Changes the Price Less Than You Would Think
Going from a 40-gallon to a 50-gallon tank typically adds only $100 to $250, because the labor is identical and the units are close in price. Going up in capacity is therefore cheap, and running out of hot water for years is not.
The exception is going up far enough to need bigger gas supply, a different vent, or an electrical upgrade. That is where a modest capacity increase turns into a large bill.
| Tank size | Suits | Installed premium over 40 gal |
|---|---|---|
| 30 gal | 1–2 people, apartment | −$100 |
| 40 gal | 2–3 people | baseline |
| 50 gal | 3–4 people | +$100–250 |
| 75 gal | 5+ people, large baths | +$600–1,200 |
| 80 gal | 5+ people, electric homes | +$700–1,400 |
What Actually Pushes the Quote up
Two homes can get quotes $2,000 apart for the same heater. It is nearly always one of the following.
- Access. An open garage is the cheap case. An attic, a crawlspace, a narrow basement stair or a closet the tank will not fit through can add several hours plus a second person.
- Code upgrades on replacement. Permitting an install often triggers requirements the old one predated. A thermal expansion tank, a drip pan and drain, seismic strapping in some states, a new shut-off, or upgraded venting. Individually $50 to $500, collectively large.
- Switching fuel or type. Tank to tankless is the big one. Gas tankless typically needs a larger gas line and new stainless venting. Electric tankless commonly needs a substantial service upgrade. Either can add $1,000 to $3,000 on top of the unit.
- Venting. Moving from atmospheric to power-vent, or repairing a shared flue, adds material and labor.
- Emergency timing. A weekend or after-hours replacement carries the same premium as any emergency call-out.
- Permit and inspection. $50 to $500 depending on jurisdiction. Worth paying. Unpermitted water heater work reliably surfaces during a sale.
Get the quote itemized: unit, labor, permit, disposal, and each code item separately. A single lump figure makes it impossible to tell whether you are paying for a $600 heater and $1,900 of labor, or the reverse.
Tankless: What the Arithmetic Actually Says
Tankless heaters last longer, take up less space and never run out. They also cost roughly double to install, and the payback case is weaker than the marketing suggests.
A gas tankless saves a meaningful but not dramatic amount of energy versus a modern storage tank, because standby loss on current tanks is much lower than it used to be. Against a typical annual saving, a $1,500 to $3,000 installation premium takes a long time to return, often approaching or exceeding the life of the unit.
The good reasons to go tankless are usually not financial: you want the floor space back, you have a household that genuinely exhausts a tank, or you are already opening up the wall. As a pure cost decision on a like-for-like swap, a storage tank normally wins.
Tank or Tankless: Beyond the Upfront Cost
A storage tank wins on mechanical simplicity and straightforward servicing. Because a storage tank is simple, a general plumber can typically inspect and repair it without specialized diagnostic tools. A storage tank delivers hot water reliably at your home's normal water pressure until its stored volume is exhausted. If your household's peak water use fits comfortably within that stored capacity, you do not experience the flow-rate bottlenecks that can limit on-demand systems.
A tankless unit wins on continuous hot water, physical footprint, and operating life. A storage tank sits on the floor, taking up roughly the footprint of a large drum and requiring service clearance around it. A tankless unit mounts directly to the wall, freeing up that floor space entirely. A tankless heater heats water on demand, meaning you will not run out of hot water during back-to-back showers or when filling a large tub. Your only operating constraint is the unit's flow rate in gallons per minute, which caps how many fixtures you can run at the same time. Tankless units also last longer, with a typical lifespan of 15 to 20 years, compared to 8 to 12 years for a gas storage tank or 10 to 15 years for an electric storage tank.
Both systems require routine maintenance to reach their full lifespan, but the jobs are completely different. A tankless heater requires periodic descaling by flushing the heat exchanger with vinegar or a descaling solution to clear mineral scale. This maintenance is essential in hard-water areas, where scale buildup reduces operating efficiency and shortens equipment life. A storage tank requires periodic flushing from the bottom drain to remove sediment, along with periodic inspection and replacement of the sacrificial anode rod that stops the steel tank from corroding. When repairs do occur, a tankless unit's electronics and specialized heat exchanger can cost more to service than a standard tank.
Verdict: Choose a storage tank for simpler repairs and lower maintenance demands, or upgrade to a tankless unit if you need continuous hot water and want to reclaim floor space.
| Feature | Storage Tank | Tankless Unit |
|---|---|---|
| Installed cost | $1,200–2,500 (gas) or $900–1,800 (electric) | $2,500–5,500 (gas) or $1,500–3,500 (electric), plus $1,000–3,000 to convert |
| Expected lifespan | 8–12 yrs (gas) or 10–15 yrs (electric) | 15–20 yrs |
| Footprint and space | Occupies floor space the size of a large drum, plus clearance | Wall-mounted and compact, freeing up floor space |
| Maintenance requirement | Periodic sediment flushing and sacrificial anode-rod replacement | Periodic descaling flush with vinegar or descaling solution |
| Hot water availability | Fixed volume that can run out during high demand | Continuous supply, limited only by flow rate |
| Final verdict | Best for lower upfront spend and standard plumber repairs | Best for continuous hot water and smaller utility footprints |
Repair or Replace
Age decides most of this. A storage tank has a service life of roughly 8 to 12 years for gas and 10 to 15 for electric.
| Situation | What to do |
|---|---|
| Leaking from the tank body, any age | Replace. There is no repair for a corroded tank |
| Under 6 years, component failure | Repair. Thermostat, element or valve is a fraction of the cost |
| 6–10 years, major component failure | Judgement call. Get both numbers |
| Over 10–12 years, anything large | Replace |
| Not enough hot water, no fault found | Likely sediment or an undersized tank rather than a failure |
Where You Can Genuinely Save
Without cutting corners that matter.
- Replace before it fails. A planned swap at year eleven is a normal-rate job. The same work at 9pm on a Sunday with water spreading is not.
- Get three itemized quotes. The spread on identical work is routinely $800 or more.
- Ask about the unit separately. Some installers will fit a heater you supply, though many will not warranty it.
- Do not oversize by default. A larger tank costs more to buy and more to run every day for a decade.
- Check for rebates. Heat pump water heaters in particular attract utility and federal incentives that can materially change the comparison.
Common questions
How much does it cost to replace a 50 gallon water heater?
Typically $1,200 to $2,500 installed for gas and $900 to $1,800 for electric, assuming a like-for-like swap with good access. Tight access, venting changes or required code upgrades push it higher.
Is it cheaper to repair or replace a water heater?
Under about six years, repair. A thermostat, element or valve is a small fraction of a replacement. Over ten to twelve years, replace, because you are spending on a component that is already past its expected life. A tank leaking from its body is always a replacement.
Why is tankless installation so expensive?
The unit is dearer, and it usually needs infrastructure the old heater did not. Gas models commonly require a larger gas line and new stainless venting. Electric models often need a service upgrade. That work is most of the price difference.
Do I need a permit to replace a water heater?
In most US jurisdictions, yes. It is regulated work involving gas or high-current electricity plus pressurised water. Unpermitted installs commonly surface during a home sale and can complicate an insurance claim.
How long does a water heater replacement take?
A straightforward like-for-like swap with good access is usually two to four hours. Add time for awkward access, venting changes, or code items such as an expansion tank or drip pan.
Does a tankless water heater really last longer than a storage tank?
Yes. A tankless unit typically lasts 15 to 20 years, while a gas storage tank lasts 8 to 12 years and an electric storage tank lasts 10 to 15 years. You must still perform periodic descaling on the tankless heat exchanger to reach that lifespan, especially if you have hard water.
Can you run out of hot water with a tankless water heater?
No, you will not run out of hot water during long showers or while filling a large tub because the unit heats water on demand. The only practical limitation is the unit's flow rate in gallons per minute, which sets a ceiling on how many fixtures can run hot water at the same time.