Water Heater Replacement Cost
What a new heater costs installed, and what moves the number.
Compiled by DIY Repair Guide · reviewed 2026-09-05 ·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 |
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.
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.