How Much Does Water Heater Replacement Cost?
Last updated: May 27, 2026 by the How Much Does That Cost? editorial team. Estimates are informational - see our methodology.
Water heater replacement typically costs $1,000 to $3,500, averaging around $1,800 for a standard 40-50 gallon gas tank unit installed as a like-for-like swap. Tank capacity, fuel type, and whether you're switching to a tankless system are the biggest factors.
A basic electric tank swap can run as low as $700-$1,000, while converting to a whole-house tankless gas system with new venting and gas line work can run $4,500-$6,000 or more. The calculator below adjusts for your water heater type and installation complexity.
Quick Answer
Typical range: $1,000 – $3,500
Low end
$700
High end
$6,000+
Actual pricing varies by location, project size, materials, labor rates, and job complexity. Use the calculator below for an estimate tailored to your project.
Water Heater Replacement Cost Calculator
Adjust the inputs below for an estimate tailored to your project.
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Estimated Project Cost
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Typical estimate: —
This is an estimate, not a quote. Actual pricing depends on your specific project details and local contractor pricing.
Cost Breakdown
How a typical project budget breaks down by category.
| Category | Estimated Cost |
|---|---|
| Water heater unit | $450 – $1,900 |
| Installation labor | $300 – $900 |
| Removal & disposal of old unit | $75 – $250 |
| Venting/piping/electrical adjustments | $100 – $400 |
| Permit & inspection | $50 – $150 |
What Affects the Cost
Water heater type
Tank water heaters are the cheapest to install, tankless units cost more upfront but take up less space and can lower long-term energy bills, and heat pump/hybrid models cost the most but are the most energy-efficient.
Fuel type
Gas water heaters usually cost a bit more than electric to install (due to venting requirements) but often have lower operating costs, especially where gas prices are low relative to electricity.
Tank capacity / household size
Larger households need a bigger tank (50-80 gallons) or a higher-capacity tankless unit, which costs more than a standard 40-gallon tank.
Venting and gas line requirements
Switching from a tank to a tankless system, or upgrading fuel types, often requires new venting or gas line work, which is the single biggest driver of conversion cost.
Permits and code compliance
Many jurisdictions require a permit and inspection for water heater replacement, and older installations may need updates like seismic strapping, expansion tanks, or drain pans to meet current code.
Removal of the old unit
Draining, disconnecting, and hauling away the old water heater adds a modest but consistent cost to every replacement.
DIY vs. Hiring a Professional
Doing it yourself
Experienced DIYers sometimes replace an electric tank water heater themselves for the cost of the unit plus supplies (often $500-$900 total), but gas and tankless installations involve gas line and venting work that many local codes require a licensed plumber to perform.
Hiring a professional
Licensed plumbers ensure proper venting, gas line sizing, and code compliance, and most offer same-day emergency replacement since a failed water heater is often an urgent repair.
Bottom line: DIY replacement of an electric tank unit is realistic for confident homeowners, but gas, tankless, and any installation requiring venting or gas line changes should be handled by a licensed plumber for safety and code compliance.
Ways to Save
- Choose a standard gas or electric tank model instead of tankless if your household doesn't need the extra hot water capacity.
- Replace your water heater proactively before it fails — emergency replacement often comes with rush fees and less time to compare quotes.
- Ask about rebates for ENERGY STAR-certified or heat pump water heaters, which are common through utility companies and some federal programs.
- Get at least two or three quotes, since installation labor pricing varies more than the unit cost itself.
- Keep the same fuel type and tank size as your existing unit to avoid additional venting, gas line, or electrical work.
- Ask your plumber about extended warranty options — many manufacturers offer 6-12 year warranties depending on the model tier.
How We Estimated This Cost
We model each calculator from public price ranges, labor data, material pricing, industry surveys, and the regional adjustment method explained in our methodology. Estimates are reviewed for consumer usefulness, then shown as ranges because local quotes, site conditions, materials, and timing can change the final price.
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Frequently Asked Questions
How much does it cost to replace a water heater?
Water heater replacement costs an average of $1,800, typically ranging from $1,000 to $3,500 depending on the type of unit and installation complexity.
How much does a tankless water heater cost compared to a tank?
A tankless water heater typically costs $1,800-$3,500 installed, roughly 50-75% more than a standard tank unit, though it can lower energy bills over time and takes up much less space.
How long does a water heater last?
Tank water heaters typically last 8-12 years, while tankless units can last 15-20 years or more with proper maintenance.
How long does water heater installation take?
A like-for-like tank replacement typically takes 2-3 hours. Converting to a tankless system or upgrading venting/gas lines can take a full day.
Is it worth switching to a tankless water heater?
Tankless water heaters cost more upfront but provide endless hot water, last longer, and use less energy — they tend to pay off for households with high hot water demand or long-term ownership plans.