All Tankless Water Heater Installation cost guides / State market page

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Tankless Water Heater Installation Cost in Washington

Tankless water heater installation in Washington typically costs between $5,205 and $10,500, with a median price of $7,000. Costs can range from $2,050 to $12,000 depending on your specific situation and contractor.

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Price distribution

Median $7,000.00 · typical $5,205.00–$10,500.00

$7,000.00

$2,050.00

$12,000.00

Shaded band: middle 50% of reports (25th–75th percentile). Median tick in teal.

Most jobs land between $2,608.00 and $11,700.00 (5th–95th percentile). Ignoring 1 outlier below and 1 above.

Based on reports from Apr 2026 (first entries this month).

Data freshness: 7 reports in the last 90 days. Help keep this current →

Data last updated Apr 8, 2026.

Latest reports

The underlying prices behind this page.

7 total reports

$10,000.00

Tacoma, WA · 6 days ago

Installed a tankless water heater outside and it cost about 10k.

$2,050.00

Tacoma, WA · 6 days ago

Used Your Local Plumbing Company for the installation of a natural gas tankless water heater.

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$ • • •

Bellingham, WA · 6 days ago

"Replaced an old Bosch tankless water heater with a new Rinnai tankless system for."

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