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King County · Updated August 2026

Best Water Heater Repair in Mercer Island, WA

Water heater repair covers failed elements, thermostats, gas valves, pilot issues, and sediment problems on tank and tankless units. The repair-or-replace math is mostly about age: under 8 years usually repair, over 10 usually replace.

$150–$600
Typical cost, typical repair

Wet-side market range — get itemized quotes before work starts

Call sooner, not later, if:
  • No hot water, or hot water that runs out fast
  • Rumbling/popping sounds (sediment) or rust-tinted hot water
  • Any water pooling at the tank base — that one usually means replacement

Top-Rated Companies for Water Heater Repair in Mercer Island

Companies whose focus matches this work are listed first, then Mercer Island's other top-rated plumbers. Same no-pay-to-play ranking as everywhere on Wetside Plumbing — the formula.

Includes pros based nearby in Seattle who serve Mercer Island.

#3 · MERCER ISLAND

Drynow Plumbing Solutions

5.0 rating · 4 Google reviews · Plumber
7650 SE 27th St #111, Mercer Island, WA 98040
#4 · MERCER ISLAND

Rudys Plumbing Inc.

3.0 rating · 2 Google reviews · Plumber
2555 76th Ave SE, Mercer Island, WA 98040
#5 · MERCER ISLAND

Ben’s Plumbing & Drain Cleaning

5.0 rating · 386 Google reviews · Drainage service
1141 NW 53rd St, Seattle, WA 98107
#7 · MERCER ISLAND

Anthony's Plumbing

5.0 rating · 282 Google reviews · Plumber
4431 SW Admiral Wy, Seattle, WA 98116
#9 · MERCER ISLAND

Knight Rooter Sewer & Drain Cleaning Services

5.0 rating · 255 Google reviews · Plumber
10202 5th Ave NE Ste 200, Seattle, WA 98125
#11 · MERCER ISLAND

Clearline Sewer Repair

5.0 rating · 170 Google reviews · Plumber
1417 NW 54th St Ste 248, Seattle, WA 98107
✓ WA License VerifiedL&I #CLEARSR788OL · check it yourself ↗
#12 · MERCER ISLAND

Odyssey Plumbing

5.0 rating · 170 Google reviews · Plumber
3901 NW Leary Wy, Seattle, WA 98107

Google Business data, 2026-08-07. See the full Mercer Island ranking →

Also searched as: commercial water heater issues, commercial water heaters, community hot water heater, electric water heater, gas water heater, gas water heater repair.

Before You Call

Water Heater Repair: Common Questions

My water heater is leaking from the bottom — repairable?

If the tank itself is leaking, no — tanks aren't repairable, and it will get worse. If it's a valve or fitting leaking, that's a cheap fix. A pro can tell in minutes; don't wait, tank failures flood.

What does a new water heater cost here?

Roughly $1,800–$3,500 installed for a standard tank in Western Washington; tankless conversions and heat-pump units run higher. See our water heater cost guide for the full breakdown.

How do I check a company's license?

Ask for their Washington L&I contractor number and verify it at secure.lni.wa.gov/verify — active license, bond, and insurance. Listings above with a green badge are ones we've already matched to an active license in state records.

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