How much does a water heater replacement cost in Seattle, WA?
| Typical totalinstalled, tankless gas | $4,256 |
|---|---|
| Range you should see in bidsthree bids on the same scope normally land inside this | $2,875 – $6,901 |
| Labor portion45% of the job — this is the part that moves by city | $1,915 |
| Material portion55% — bought at national prices | $2,341 |
| Plumbers, Pipefitters, and Steamfitters pay near Seattleabout $46/hr · Seattle-Tacoma-Bellevue, WA metro | $96,250/yr |
| U.S. mean for the same tradeSOC 47-2152 | $72,170/yr |
| Versus the national pricetrade pay here runs +33.4% against the U.S. mean | +$556 |
Notes
- Where the number comes from. The national price for a gas tankless water heater installation is $3,700 installed — water heater replacement pricing published for 2026, unit plus installation. Labor is about 45% of that. Plumbers, Pipefitters, and Steamfitters near Seattle, WA average $96,250 a year against a U.S. mean of $72,170 — a factor of 1.334 — so the labor half is scaled by that and the material half is not. Source: BLS OEWS May 2025 for the Seattle-Tacoma-Bellevue, WA metro area, SOC 47-2152.
- Why the city matters, not just the state. Trade pay moves inside a state as much as it does between states. Crews do not commute across a state to bid a job, and materials ship at national prices either way — so a metro wage is the honest input here and a state average quietly rounds four different cities into one number.
- What is in the price: the heater, removal and disposal of the old one, new flex connectors, a drain pan, an expansion tank where code requires it, and labor.
- What is not: a gas line upsize, new venting, an electrical circuit for an electric unit, and bringing an old install up to current code. These are the lines that turn a $4,256 quote into a $5,319 invoice, so ask about each one before signing.
- Use this as a bid check, not a quote. It prices an average job in average condition. Difficult access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average for the job.
a gas tankless water heater installation in Seattle, WA
$4,256 is the typical number, and three bids on the same scope normally land between $2,875 and $6,901.
That is $556 more than the same job priced at the national average.
Why the city changes the number
About 45% of this job is labor — $1,915 of the $4,256 above. Labor is the only part that moves locally; a bundle of material costs what it costs wherever it is nailed down.
Plumbers, Pipefitters, and Steamfitters near Seattle average $96,250 a year, against a U.S. mean of $72,170. That is a factor of 1.334, so the labor half is scaled by it and the material half is not.
Source: BLS OEWS May 2025 for the Seattle-Tacoma-Bellevue, WA metro area, SOC 47-2152.
What the quote should include
The lines that turn a quote into an invoice
Ask about each of them before you sign. On a job this size they are the difference between $4,256 and something a quarter higher.
Use it as a bid check, not a quote
This prices an average job in average condition. Access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average.
If a bid lands outside $2,875 – $6,901, that is not automatically wrong — but it is the question worth asking out loud.
Nearby sizes
Read more
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- Is a 40 Gallon Water Heater Enough for 2 Bathrooms?Two bathrooms is not a load. Two showers at 7:10am is a load, and the answer changes completely depending on what heats the water.
- T&P Valve Keeps Releasing Water — Thermal Expansion, Not a Bad ValveThe valve is the messenger. Replacing it silences the message for a few weeks and leaves the pressure exactly where it was.