Water heater repair in Redmond, WA

Two water supplies in one city

Redmond is one of the few Eastside cities that still pumps a large share of its own water. Roughly 40 percent comes from city wells that tap the shallow aquifer under downtown and the Sammamish River valley. The other 60 percent or so is Tolt River water from the Cascade foothills, treated by Seattle Public Utilities at its Tolt treatment facility with filtration and ozone and delivered through Redmond's membership in Cascade Water Alliance.

Customers east of the river, including downtown and Southeast Redmond, generally get well water blended with Tolt water, and the Tolt share rises in summer to meet demand. Neighborhoods west of the river, such as Overlake, Grass Lawn and Idylwood, along with the Novelty Hill service area, receive Tolt water only. Tolt water is very soft and slightly aggressive toward metal, so anode rods there do more of the work. Well water carries more calcium and builds a modest amount of sediment over several years.

Inlet temperatures are mild by national standards. Winter water usually sits in the mid to upper 40s, and late summer brings it close to 60°F, so heaters rarely face the extreme temperature rise seen in the Rockies or the upper Midwest.

Newer homes, townhouses and where heaters sit

A large share of Redmond's housing was built after 1980. Education Hill, Grass Lawn and the Rose Hill edge are lined with split-entry and two-story houses built between the 1970s and 1990s, typically with a gas tank in the garage. Newer subdivisions on Novelty Hill and near Redmond Ridge, along with the townhouse rows of Overlake Village, often have tankless gas units on an exterior wall or heat pump tanks in a garage or utility room.

Downtown Redmond and Marymoor Village have filled with mid-rise apartments and condos, where water heaters are typically small electric tanks in hall closets or central systems in the building. Owners of these units often learn about a failed heater from a downstairs neighbor, so a drain pan and a leak sensor are worth a lot in a stacked building. Our first steps for a leaking condo heater can limit the damage.

Windstorms, outages and earthquake straps

Pacific windstorms knock out power across the Eastside every few years, as the November 2024 bomb cyclone did for days in parts of Redmond. A standing-pilot gas tank carries on heating when the grid goes down, but most tankless units and heat pump tanks stop when the power does, and many newer gas tanks with electronic ignition do too. It is worth knowing which kind you have before the next storm.

With the Seattle Fault and Cascadia subduction zone nearby, Washington's code calls for every tank to be braced against quakes. Two straps, upper and lower third, are standard. Plumbers in Redmond still find older garage heaters with one loose strap or none, and a toppled tank on Education Hill could rip its flex connector right out.

Heavy autumn rain is the other local factor. Homes in the Sammamish River valley and along Bear Creek sit on lower ground, and a garage that takes on water during a big atmospheric river can soak the base of a gas heater and its burner.

The problems plumbers see most in Redmond

• Spent anode rods in tanks on very soft Tolt-only water west of the Sammamish.
• Tankless error codes from flow sensor, igniter or fan faults on units installed in the 2010s.
• Heat pump tanks running on backup elements because filters were never cleaned.
• Missing or loose seismic straps on older garage heaters.
• Closet tank leaks in downtown condos that reach the unit below.
• Sediment buildup where well water is part of the blend east of the river.

Typical water heater prices in Redmond

Redmond is one of the more expensive places in Washington to hire a plumber, in line with Bellevue and Kirkland, because labor costs and demand on the Eastside are high. Tight condo closets, rooftop or wall-mounted tankless units and installs that need a new 240-volt circuit sit at the top of these ranges.

Washington L&I and Redmond permits

In Washington, the Department of Labor and Industries both registers contractors and certifies individual plumbers. A plumbing company must be registered and bonded, and the person doing the work must carry a journey-level plumber certificate or work as a supervised trainee. L&I's online lookup lets you check both in a minute.

Redmond's Development Services Center handles heater-swap permits, and like most Eastside cities it takes applications through the MyBuildingPermit portal. City inspectors want to see sound straps, a properly routed relief line, an expansion tank where needed and a clean vent connection. Homes on Redmond Ridge, Novelty Hill and Union Hill outside city limits are permitted through King County instead.

PSE, electrification and choosing a heater

Puget Sound Energy provides both electricity and natural gas in Redmond. Gas tanks and tankless units have been the norm for decades, but Washington's energy code now steers new construction toward heat pumps, and many homeowners replacing a gas tank are weighing a heat pump water heater. A garage in Redmond rarely drops below freezing for long, which suits them well. PSE has run heat pump rebate programs at times, and federal credits have come and gone, so ask the installer to confirm current offers for your Redmond address.

If you keep gas, a tankless unit works well on Redmond's mild inlet water, though it needs yearly attention where well water is in the blend. Weigh the numbers in our tank-or-tankless price comparison, useful for Redmond buyers.

Caring for a heater on soft Tolt water

Soft water spares tanks from heavy scale, but it consumes the sacrificial anode faster. On Tolt-only water in Overlake or Grass Lawn, having the anode pulled and inspected by about year three or four can add years to a tank. Homes east of the river get more sediment, so a yearly drain from the valve at the base is the better habit there. For tankless owners, the blended zone calls for annual descaling while Tolt-only homes can often stretch it longer. Steps are in our guide to draining well-blend sediment.

Repair or replace in Redmond

If a tank still in its first eight years loses an igniter, thermocouple, valve or element, the fix is money well spent. A tank in its second decade that has started to weep at the base, or one whose anode has been gone for years, is usually better replaced, and the replacement is a natural point to reconsider gas versus heat pump. Tankless units over fifteen years old with a failing heat exchanger are often cheaper to replace than to rebuild.

For condo owners, the cost of a leak to the unit below often settles the question in favor of replacing an aging heater before it fails.

Around Redmond

Kirkland to the west and Bellevue to the south both buy Cascade Water Alliance water and issue their own permits. Woodinville to the north is served largely by the Woodinville Water District. Sammamish to the southeast relies on the Sammamish Plateau Water district, and Redmond Ridge and Union Hill lie in unincorporated King County. Out in the Snoqualmie Valley, Duvall and Carnation each run separate water service and permitting.

Water heater questions from Redmond