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How much does a water heater replacement cost in Mercer Island, WA?

US national rangeUpdated Prices checked October 20262 sources

A water heater replacement costs $882 to $1,826 nationally, typical $1,348. We have no documented price index for Mercer Island for this job, so this is the US national range from HomeAdvisor, checked October 2026.

US national range, not adjusted for this city

Low
$882
Typical
$1,348
High
$1,826

Get water heater replacement quotes in Mercer Island

Water heater replacement cost in Mercer Island, WA

We have no documented price index for Mercer Island for this job, so the table shows the US national range.

Water heater replacement cost in Mercer Island, WA
EstimateLowTypicalHighBasisChecked
US national range$882$1,348$1,826Per unit, installed (unit plus labor); typical range of customer-reported jobs (HomeAdvisor)October 2026

Water heater replacement cost by type or size

US national figures in USD, as published by each source.

Water heater replacement cost by type or size
Type or sizePrice (USD)Source
40-gallon tank, installed$550 to $2,300Fixr
50-gallon tank, installed$700 to $2,500Fixr

What drives the cost of a water heater replacement

  1. Type of heater

    Tank, tankless, heat pump and solar units differ widely in price.

  2. Tank size

    A 50-gallon tank costs more than a 40-gallon tank.

  3. Fuel source

    Switching fuel, or adding gas lines or electrical circuits, raises the cost.

  4. Venting and code upgrades

    Power venting, expansion tanks and code fixes add parts and labor.

  5. Labor and access

    Labor is about half the total; tight closets and attics take longer.

Permits and what's included in Mercer Island

Permit note

Most areas require a plumbing permit. A standard permit runs about $25 to $300, and a separate gas permit, if needed, about $50 to $300.

Rules are set locally; confirm with Mercer Island’s building department.

What’s usually included

  • The new water heater
  • Labor to disconnect the old unit and connect the new one
  • Removal of the old unit (often included; confirm on the quote)

Scopes vary. Get the scope in writing on every quote.

Get water heater replacement quotes in Mercer Island

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Top-ranked plumbers in Mercer Island

The top 3 of 635 plumbers we rank for Mercer Island, WA, by CR Score. Paid placement never changes rank.

  1. #1
    Homeservice Plumbers
    CR Score 665.0from 1,379 Google reviews
  2. #2
    Ready Rooter
    CR Score 664.9from 1,621 Google reviews
  3. #3
    Mr. Rooter Plumbing of Seattle
    CR Score 654.8from 2,646 Google reviews

See all ranked plumbers in Mercer Island

How to check a plumber's license in Washington

In Washington, Washington State Department of Labor & Industries licenses Contractor registration and plumber certificates.

  1. Search the business name or license number on the Washington State Department of Labor & Industries license lookup.
  2. Check that the status is active and the name matches the contract or truck.
  3. Ask for proof of insurance before work starts.

No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.

Guide checked October 2026. How we verify licenses

Water heater replacement cost in Mercer Island: questions

How much does a water heater replacement cost in Mercer Island, WA?

A water heater replacement costs $882 to $1,826 nationally, typical $1,348. We have no documented price index for Mercer Island for this job, so this is the US national range from HomeAdvisor, checked October 2026.

Do I need a permit for a water heater replacement in Mercer Island?

Most areas require a plumbing permit. A standard permit runs about $25 to $300, and a separate gas permit, if needed, about $50 to $300. Rules are set locally, so confirm with Mercer Island’s building department.

What affects the cost of a water heater replacement?

Type of heater: tank, tankless, heat pump and solar units differ widely in price. Tank size: a 50-gallon tank costs more than a 40-gallon tank. Fuel source: switching fuel, or adding gas lines or electrical circuits, raises the cost. Venting and code upgrades: power venting, expansion tanks and code fixes add parts and labor.

How many plumbers serve Mercer Island?

We rank 635 plumbers for Mercer Island, WA by CR Score. Get at least three written quotes for the same scope.

What is usually included in the price?

The new water heater; Labor to disconnect the old unit and connect the new one; Removal of the old unit (often included; confirm on the quote). Always get the scope in writing on the quote.

Sources

Checked October 2026. Figures are estimates, not quotes.

  1. HomeAdvisor: Water heater installation cost · page updated June 17, 2026 · checked October 2026Primary source. Used for: Low, typical and high; drivers; permit.
  2. Fixr: Water heater installation cost · page updated January 27, 2026 · checked October 2026Used for: Prices by tank size; cross-check: $900 to $3,000, average $1,400 for a gas tank.
These are published estimates, checked October 2026. They are not quotes. Typical range shown: $882 to $1,826. Editorial policy

Related pages

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