Water Heater Replacement Cost Calculator
Cost data last checked October 5, 2026.
Replacing a 50-gallon gas tank water heater typically costs $825 to $3,800 installed, with these lines included: Permit and inspection; Old unit removal and disposal.
Typical installed cost$825 - $3,800From published national cost guides, checked on the date above the calculator. Sources are listed below it.
1. Describe the job
Not sure? Most 1-2 person homes use 40 gal; 3-4 people use 50 gal.
2. Add-ons that change the price
- 50-gallon tank water heater, installed$700 - $3,100
- Permit and inspection$50 - $200
- Old unit removal and disposal$75 - $500
Estimate only, based on published national cost guides (see sources below). Local labor rates and material prices vary; always get a written quote.
How we got this
- Installed price of a 50-gallon tank water heater, from HomeGuide's tank prices by size: $700 to $3,100. (HomeGuide)
- Basement install: this calculator adds no location extra for a basement. It adds one only for a utility closet, garage or attic.
- Each add-on you checked is its own line: permit and inspection: $50 to $200 (HomeGuide); old unit removal and disposal: $75 to $500 (HomeGuide)
- Total installed cost, low ends added together and high ends added together: $700 to $3,100 + $50 to $200 + $75 to $500 = $825 to $3,800
The idea behind it: The guides price the heater with a standard install as one figure and each extra job (permit, haul-away, venting, wiring, a location that needs more work) as its own range, so the estimate starts from the base price for your fuel, type and size and adds one line for each extra your job needs. Adding every low end and every high end gives the cheapest and the priciest version of the same job.
3. Have a quote already? Check it
4. Flush it, repair it, or replace it?
A flush is worth trying first and may quiet the noise. At 9 years old this is at or near the end of the typical 8-12 year tank lifespan. Cost guides suggest considering replacement once a tank passes 10 years, so start planning rather than investing further in it.
Typical flush cost: $100 - $250. Typical repair cost for this heater type: $150 - $700.
5. Tank vs. tankless: 10-year cost of ownership
| Type | Installed | Energy per year | 10-year total |
|---|---|---|---|
| Gas tank | $700 - $3,100 | $250 - $420 | $3,200 - $7,300 |
| Gas tankless | $1,400 - $5,600 | $220 - $480 | $3,600 - $10,400 |
With these published gas figures, tankless does not reliably cost less to run, so the upfront gap does not shrink.
Enter your fuel type, size and any extra work the install needs to see the typical installed price range, check a quote you already have, and find out whether your old unit is worth flushing, repairing, or replacing.
How this is calculated
The estimate starts with a base installed price for your fuel type and size, pulled from published national cost guides. Every add-on you check adds its own published range on top: permits, haul-away, venting, a new circuit, a bigger gas line, or moving the unit. The result is a range, not a single number, because the same size and fuel type can cost very different amounts depending on how much beyond a straight swap the job actually needs.
Each line is a published low-to-high range. The estimate adds the low ends together ($700 + $50 + $75 = $825) and the high ends together ($3,100 + $200 + $500 = $3,800).
Show the numbers
| Line item | Low | High |
|---|---|---|
| 50-gallon tank water heater, installed | $700 | $3,100 |
| Permit and inspection | $50 | $200 |
| Old unit removal and disposal | $75 | $500 |
| Typical installed cost | $825 | $3,800 |
Ranges: HomeGuide and This Old House, listed in the sources below. Drawn from the calculator's own code.
Labor alone, separate from the price of the unit itself, typically runs $200 to $1,000 for a standard tank swap, according to HomeGuide's labor-cost breakdown. That is most of the reason a quote can vary so much between two homes with the same size tank. This Old House notes that most jurisdictions require a permit for water heater installation, especially for a fuel-type change or a venting modification, and that installing your own water heater can expose you to gas leaks, carbon monoxide exposure, flooding, or a voided equipment warranty. The base price above assumes a licensed installer does the work, not a DIY job.
Worked example
A homeowner has a 50-gallon gas tank water heater in the basement, 11 years old, and it's started rumbling. They want a like-for-like replacement, with the old unit hauled away and a permit pulled.
| Line item | Typical range |
|---|---|
| 50-gallon gas tank water heater, installed | $700 - $3,100 |
| Permit and inspection | $50 - $200 |
| Old unit removal and disposal | $75 - $500 |
| Total installed cost | $825 - $3,800 |
Because the unit is over 10 years old, the flush vs. replace check above recommends replacing rather than flushing, even though the symptom (rumbling) would suggest a flush on a younger heater. If the same heater were 4 years old with the same noise, the recommendation would flip to a flush (This Old House lists a system flush at $100-$250) instead of a $825-$3,800 replacement.
What this estimate leaves out
- Your home: access, code requirements and the condition of the venting, gas line and wiring can only be judged on site.
- Local prices: every figure is a national range from the cited guides, and labor rates and permit fees differ by region.
- Rebates, financing and any tax credit, and the running cost of the unit after it is installed.
- Repairs to damage from a leaking old tank, such as flooring or drywall.
For a final price, get at least two written quotes from licensed plumbers.
Reading a plumber's quote
A quote below the typical range is not automatically a red flag, but it's worth checking that it includes haul-away of the old unit, a permit if your city requires one, and a real installer warranty, not just the manufacturer's tank warranty. A quote above the typical range is not automatically padding either; ask what's driving it. The most common legitimate reasons are a venting change, a new electrical circuit, a gas line upgrade, or an emergency/after-hours callout. If none of those apply to your job and the number is still well above the range, get a second quote before you sign.
Tank vs. tankless: what actually changes the price
Tankless units cost more to buy and more to install, mainly because gas tankless models need a larger gas line and dedicated venting more often than tank models do. That upfront gap is real: HomeGuide puts tankless at $1,400 to $5,600 installed versus $600 to $3,100 for a standard tank. Whether energy savings win any of it back depends on the fuel. HomeGuide rates tankless units 8% to 34% more energy-efficient than standard tanks for the average household, but its published gas running costs overlap: about $250 to $420 a year for a gas tank and $220 to $480 for gas tankless. With those gas figures, tankless does not reliably cost less to run, so the upfront gap does not shrink. Electric tankless (about $340 to $540 a year) is cheaper to run than an electric tank ($530 to $600), so there the savings slowly recover part of the higher install cost. Propane running costs are not published in these guides. The ownership table above shows the numbers for your fuel type.
Questions people ask
How much does it cost to replace a water heater?
HomeGuide puts a standard 40- to 50-gallon tank water heater at $600 to $3,100 installed. For tankless, HomeGuide gives $1,400 to $5,600 installed. The wide range comes from fuel type, tank size or flow rate, and how much plumbing, gas line, venting or electrical work the install needs beyond a straight swap.
Is a tankless water heater worth the extra upfront cost?
It depends mostly on your fuel type. Tankless units cost more to install, and HomeGuide rates them 8% to 34% more energy-efficient than standard tanks for the average household. That does not always mean a lower bill. HomeGuide puts a gas tank at about $250 to $420 a year to run and gas tankless at about $220 to $480, so with gas the upfront gap does not reliably shrink. Electric is different: electric tankless runs about $340 to $540 a year against $530 to $600 for an electric tank, so the energy savings slowly pay back part of the higher install cost. The ownership table in the calculator shows the numbers for your fuel type. If you're moving in a few years, a tank is usually the cheaper choice overall.
Should I repair, flush, or replace my water heater?
Rumbling or popping noises on a tank heater under about 8 years old, the low end of HomeGuide's typical 8 to 12 year lifespan, are often sediment, and a flush may fix it (This Old House lists a system flush at $100 to $250). This Old House treats rusty water as a sign to consider replacement, so on a younger heater have a plumber confirm the rust is coming from the tank before you replace it. HomeGuide says to consider replacing a water heater over 10 years old, or when a repair costs more than 50% of replacing it. This Old House adds water pooling around the base and repeated repair calls within a year as signs of a serious problem.
What makes a water heater installation quote higher than expected?
HomeGuide prices the biggest add-ons: new gas venting at $500 to $1,500 if none exists, a new dedicated 240V circuit at $250 to $900, upsizing a gas line at $350 to $2,000, and moving the unit to a new location at $500 to $2,500. Switching fuel types costs more, and can add $250 to $2,300 depending on the direction once HomeGuide's and This Old House's figures are combined. A quote with several of these on it can legitimately run well above the base installed price.
How long does water heater installation take?
A straightforward tank swap takes a licensed plumber about 1 to 6 hours, combining This Old House's 1 to 3 hours with HomeGuide's 2 to 6 hours. This Old House puts a complete tankless setup, including gas lines, electrical work and venting, at 4 to 6 hours, while HomeGuide says a new tankless installation can take up to 10 hours.
How long do water heaters last?
HomeGuide says tank water heaters typically last 8 to 12 years, longer with regular flushing, and that tankless water heaters typically last 15 to 20 years with routine descaling. Age past that range, on top of a symptom like rust or noise, is the strongest signal to replace rather than repair.
How much extra does emergency or same-day service cost?
HomeGuide prices non-business-hours plumbing service at a $150 to $250 flat surcharge on top of the job. This Old House, pricing water heater jobs specifically, puts emergency service at $200 to $500 for after-hours or weekend installations, so the calculator uses the combined $150 to $500 range. HomeGuide also lists hourly rates for emergency work, $120 to $300 an hour after-hours on a weekday, $150 to $350 on a weekend, and $200 to $450 or more on a holiday, and its own rate table notes these hourly rates do not include the service call fee or surcharge, so they are billed on top of it, not instead of it. A leaking tank is the symptom most likely to turn into an after-hours call, since it usually cannot wait until normal business hours.
Does the federal tax credit for heat pump water heaters still apply in 2026?
No. ENERGY STAR states the federal 25C tax credit, 30% of the project cost up to $2,000, was effective for units purchased and installed between January 1, 2023 and December 31, 2025. A heat pump water heater installed in 2026 does not qualify for it, though some state or utility rebate programs may still apply depending on where you live and your income.
Where these numbers come from
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