Water Heater Replacement Cost Calculator
Estimate the cost to replace a water heater by type (gas, electric, tankless, heat pump), tank size, and whether it's a straight swap or a conversion. Get a materials and labor breakdown in seconds.
Project Details
40 gallons suits 2–3 people; 50 is the most common; 75–80 for large households. Tankless units are sized by flow rate, not gallons, so this is ignored for tankless types.
Switching fuel type, going tankless, or moving the unit means new venting, a larger gas line, or added electrical — the single biggest labor swing.
Most jurisdictions on a closed (valved) supply now require a thermal expansion tank with a new water heater.
Estimated Cost
Low
$940
Average
$1,795
High
$3,350
Cost Breakdown
Materials
| Item | Qty | Low | Mid | High |
|---|---|---|---|---|
| Gas Tank Water Heater | 1 unit | $550 | $950 | $1,700 |
| Thermal Expansion Tank | 1 unit | $50 | $150 | $350 |
| Subtotal | $600 | $1,100 | $2,050 |
Labor & Fees
| Item | Qty | Low | Mid | High |
|---|---|---|---|---|
| Installation Labor | 1 job | $250 | $500 | $900 |
| Old Unit Removal & Disposal | 1 job | $40 | $75 | $150 |
| Permit & Inspection | 1 job | $50 | $120 | $250 |
| Subtotal | $340 | $695 | $1,300 |
Notes
- • Based on a 50-gallon gas tank water heater.
- • Assumes a straight swap of the same type in the same location. Switching fuel or going tankless adds substantial labor.
- • Includes a thermal expansion tank, which most codes now require on a closed supply system.
- • Excludes drywall, flooring, or framing changes if the unit is being moved, and any panel upgrade a large electric or heat-pump unit may need.
About the Water Heater Calculator
Replacing a water heater is one of those jobs that arrives on its own schedule — usually the morning you find a cold shower or a puddle on the floor. The price swings widely with the type you choose, the tank size, and whether the new unit drops straight into the old one's spot or needs new venting, gas, or electrical. This calculator combines the appliance, an expansion tank, installation labor, old-unit disposal, and permit fees into a realistic low, average, and high range before you call a plumber.
How We Calculate Water Heater Cost
We start with the appliance price for the type you pick — electric or gas tank, heat-pump, or tankless — scaled by tank size for storage units (tankless is sized by flow rate, so size is ignored there). On top of that we add installation labor for a straight swap, plus a conversion line when you're switching fuel, going tankless, or relocating the unit, since that drives new venting and gas or electrical work. A thermal expansion tank, old-unit removal, and a permit round out the estimate, split into materials and labor across low/average/high tiers.
Factors That Affect Water Heater Cost
The two biggest cost drivers are type and install scenario. A like-for-like tank swap is the cheap path; a tankless or fuel conversion can double or triple the labor because of venting, gas-line resizing, or a panel upgrade. After that come tank size, whether code requires an expansion tank, how accessible the unit is (a tight attic or crawl space costs more than a garage), and local plumber rates — use the Location selector to adjust labor for your state. Disposal and permit fees are small but real, and a moved unit can pull in drywall and flooring work the estimate doesn't cover.
Water Heater Cost by Type
Typical installed cost and service life by type. Installed cost includes the unit and standard labor; conversions and difficult access run higher.
| Type | Installed cost | Typical lifespan | Notes |
|---|---|---|---|
| Electric tank | $800 – $1,800 | 8–12 yrs | Cheapest to install |
| Gas tank | $1,100 – $2,500 | 8–12 yrs | Lower running cost where gas is available |
| Heat pump (hybrid) | $1,800 – $4,500 | 13–15 yrs | Most efficient; needs space + drain; rebates often apply |
| Tankless electric | $1,200 – $3,000 | 18–20 yrs | Endless hot water; may need a panel upgrade |
| Tankless gas | $2,500 – $5,500 | 18–20 yrs | Endless hot water; needs venting + larger gas line |
Source: Installed-cost ranges, 2026 (HomeAdvisor / Fixr); lifespan per U.S. Department of Energy. Vary by region and access.
Tank vs. tankless: which is worth it?
A storage tank is cheaper to buy and install, simpler to service, and a like-for-like swap is usually a half-day job. The trade-off is an 8–12 year life, standby heat loss, and a finite tank of hot water that runs out during back-to-back showers.
Tankless heats water only when you open a tap, so it never runs out and lasts nearly twice as long — but the install is where the money goes. Gas models need proper venting and often a larger gas line; electric models can demand a service-panel upgrade. If you're staying in the home long enough to bank the energy savings and the venting or panel work isn't a major project, tankless pays off. If you need hot water back today and budget is tight, a tank swap is the pragmatic choice. A heat-pump (hybrid) tank splits the difference: tank simplicity with roughly half the running cost, provided you have a warm, ventilated space and a condensate drain.
Signs your water heater needs replacing
Catch a failing heater before it floods. Watch for rusty or discolored hot water, a metallic taste, popping or rumbling from sediment hardening in the tank, water that no longer gets fully hot, moisture or rust around the base, and an age past 10–12 years for a tank unit (check the serial-number date on the label).
A small leak from a fitting is often a cheap fix. Water weeping from the tank body itself is not — the steel has corroded through and the unit is done. If you're seeing two or more of these signs on a heater near its rated life, replace it on your schedule rather than waiting for the 2 a.m. emergency that adds water-damage cleanup to the bill.
Water Heater Cost by Tank Size
| Tank Size | Low | Average | High |
|---|---|---|---|
| 30 gallons | $874 | $1,681 | $3,146 |
| 40 gallons | $907 | $1,738 | $3,248 |
| 50 gallons | $940 | $1,795 | $3,350 |
| 65 gallons | $989 | $1,880 | $3,503 |
| 75 gallons | $1,023 | $1,938 | $3,605 |
| 80 gallons | $1,039 | $1,966 | $3,656 |
Gas tank water heater, standard swap, at the national average. Use the calculator above for other types and your state.
Planning a larger project? You may also want to estimate costs for house repiping cost, water damage repair cost, or bathroom remodel cost.
Sources
- • HomeAdvisor — Water Heater Installation Cost (2026)
- • Fixr.com — Water Heater Replacement Cost
- • Angi — Cost to Install a Water Heater
- • U.S. Department of Energy — Energy Saver: Water Heating (checked 2026-06)
Costs are based on current industry ranges and vary by location and market conditions. See how we calculate costs — cost data last reviewed June 2026.