Record type, fuel and capacity
Use the existing label to identify the unit. A tank’s storage capacity and a tankless system’s flow rating are different measurements; enter the option that matches the project.
Home › Water heater
Water heater replacementWater heater replacement cost calculator
Most people price a water heater the day it fails, which is the worst possible time to be comparing quotes. The unit itself is rarely the expensive part — the water damage is.
Rates reviewed August 2026
See the illustrated project guide
Written and maintained byMantu Kumar
Evidence review4 August 2026
Calculation rulesRead the methodology
Quality standardEditorial policy
Water heater replacement estimate
No email · nothing sentA closer look at your project
The space around the heater affects the job
Replacing a unit in the same location and converting to a different system are separate scopes. Record what you have before comparing prices.
The three detail views below enlarge parts of the same photograph. Use them with the planning checks. Photos are AI-generated illustrations, not installation instructions or actual claim records.
Explain any planned conversion
Tell the installer if you want a different fuel, technology or location. Ask whether new pipework, venting or electrical work belongs in the proposal.
Check removal and access
Measure accessible doorways and note where the existing heater sits. Ask how the old unit will be removed and which pan, drainage and permit items are included.
Before comparing totals, ask for these details
- Unit
- Fuel, capacity or flow rating, model and warranty
- Related work
- Connections, drainage, venting or electrical changes
- Installation
- Removal route, labor, disposal and permit responsibility
Advertisement
On this page
Tank or tankless
A conventional tank heater is cheaper to buy, cheaper to fit and simpler to service. It keeps 40 to 80 gallons hot around the clock, which costs energy, and it lasts 8 to 12 years.
A tankless unit heats on demand, lasts 20 years or more, and never runs out. It also costs two to three times more to install, because it usually needs a bigger gas line, a new vent, and sometimes an electrical upgrade. The energy saving is real but modest — the case for tankless is longevity and endless hot water, not the utility bill.
| Type and size | Installed, typical | Expected life |
|---|---|---|
| 30 gallon tank, electric | $900 – $1,700 | 10 yrs |
| 40 gallon tank, gas | $1,200 – $2,300 | 10 yrs |
| 50 gallon tank, gas | $1,400 – $2,700 | 10 yrs |
| 75 gallon tank, gas | $2,000 – $3,800 | 10 yrs |
| Tankless, gas | $3,000 – $6,500 | 20 yrs |
| Heat pump / hybrid | $2,200 – $4,500 | 14 yrs |
Sizing
A 40 gallon tank suits most two to three person households. Four or more people, or a house with two bathrooms in simultaneous use, usually wants 50 to 75. Tankless units are rated by flow rather than capacity — measured in gallons per minute, sized against how many fixtures might run at once.
Oversizing a tank wastes energy keeping water hot that nobody uses. Undersizing means cold showers and a unit that runs constantly. Neither is expensive to get right at the point of purchase, and both are annoying to live with for a decade.
Advertisement
The part that actually costs money
A tank holds 40 to 80 gallons. When one fails, it frequently fails by emptying that onto the floor. In a finished basement or an upstairs closet, the resulting damage regularly exceeds the cost of the heater several times over — Angi puts water damage repair at $3.75 to $7 per square foot, with homeowners typically spending $1,300 to $5,550, and considerably more where mold remediation follows.
Sudden discharge is covered. A slow leak usually is not.
Most homeowners policies cover water damage from a sudden burst, subject to your deductible.
Gradual seepage that went unnoticed is excluded almost everywhere, and the heater itself is not
covered when it simply wears out. A $15 pan and a $50 leak sensor are the cheapest insurance
available for a unit past eight years old.
When to replace before it fails
Rusty hot water, a rumbling noise from sediment, moisture around the base, or an age past ten years all point the same direction. Replacing on your own schedule costs the same as replacing in an emergency, minus the emergency call-out premium and minus the flooring.
Water-heater result summaryThe complete installation is more than the tank: capacity, fuel, venting or electrical connections, access, removal, drain protection and permit work can all change the range. Sudden covered damage is different from age, corrosion, leakage over time or ordinary equipment failure.
Water heater renovation cost: replacement or conversion?
A like-for-like replacement and a tank-to-tankless conversion are different projects. Before comparing estimates, identify fuel type, tank capacity or required flow rate, location, venting and whether electrical or gas connections need changes.
Ask the installer to itemize the unit, removal, labor, permit responsibility, drain pan or condensate work, venting and any required utility upgrades. An allowance in this calculator is not proof that every site-specific requirement is covered.
Use the calculator for a planning range. If you also need heating or cooling equipment, use the HVAC replacement cost calculator for that separate scope.
Questions
How much does it cost to replace a water heater?
A straight tank swap typically runs $1,200 to $2,700 installed for 40 to 50 gallons. Tankless runs $3,000 to $6,500 because it usually needs gas line, venting and sometimes electrical work. Removing and hauling the old unit adds $100 to $500.
Is tankless worth the extra cost?
For longevity and endless hot water, often yes — 20 years or more against 10 for a tank. For energy savings alone the payback is slow. The install premium comes from gas line sizing, new venting and occasionally an electrical upgrade.
What size water heater do I need?
40 gallons suits most two to three person households, 50 to 75 for four or more or where two bathrooms run at once. Tankless units are sized by flow rate in gallons per minute rather than capacity.
Does homeowners insurance cover a leaking water heater?
Sudden discharge is generally covered for the resulting water damage, subject to your deductible. Gradual seepage is excluded almost everywhere, and the heater itself is not covered when it wears out.
How long does a water heater last?
Tanks commonly reach 8 to 12 years, tankless 20 or more, hybrid heat pump units around 14. Hard water shortens all of these — annual flushing genuinely helps.
What are the signs a water heater needs replacing?
Rusty hot water, rumbling from sediment buildup, moisture around the base, or an age past ten years. Replacing on your own schedule avoids the emergency call-out premium and the flooring bill.
Related
- Flooring replacement — what a failed tank usually destroys
- Claim gap calculator — run the water damage figure through it
- What insurance actually pays — sudden burst versus slow leak
Where these figures come from
Rates are cross-checked against 2026 published pricing from Angi, HomeGuide and Modernize. Angi notes removal and haul-away at $100 to $500, drywall work at $1,000 to $3,000 where a wall must be opened, and water damage repair at $3.75 to $7 per square foot averaging $1,300 to $5,550. Depreciation is modeled straight-line against expected service life; carriers use
their own schedules and some cap payouts by age. These are ranges for planning, not quotes,
and nothing here is a coverage determination.
Evidence trail
Reviewed 4 Aug 2026Sources used to check this model
Primary public references anchor equipment guidance, plumbing labor and insurance terminology. Calculator rates remain planning assumptions tested against published market ranges.
Equipment standardDOE: Water heating
U.S. labor referenceBLS: Plumbers and pipefitters
Insurance termsNAIC homeowners guidance
These organizations do not endorse ReplaceCost. Local contractor quotes, permits, product specifications and the written insurance policy control the real result. See the full methodology for the source hierarchy and update process.