Two of the tanks we replaced in Seattle this year were built in 2010 and 2014, which says a lot about how water heaters age in this city. These are the questions Seattle homeowners ask us most about lifespan, replacement and what the city's water and its rules mean for the tank in the closet.
How long does a water heater last in Seattle?
Ten to fifteen years for a tank, and Seattle tanks reach the top of that range. The city's water is very soft, so sediment barely builds up and the tank fails from corrosion of the steel rather than scale. Tankless units run twenty years or more with maintenance. Past twelve years, plan the replacement rather than wait for the leak.
The two tanks we swapped this year, a 2010 unit in a Haller Lake garage and a 2014 unit in a Greenwood condo, had both passed the rule of thumb. That is the Seattle pattern: long lives, and then a failure that gives little warning.
Does Seattle's soft water mean I can skip flushing the tank?
Mostly, yes. With water at one to two grains per gallon, a Seattle tank collects a fraction of the sediment a hard-water city produces, so the annual flush matters far less than the anode rod, the sacrificial rod that protects the steel from corrosion. Have the anode checked around year five; replacing it is what extends a tank's life here.
What are the signs my water heater is about to fail?
Rust-colored hot water, moisture or corrosion at the base ring, a relief valve that weeps, and hot water that runs out sooner than before. In Seattle the first three matter most, because they point at the steel, and once the tank itself is leaking there is no repair. A tank past twelve years with any of these is due.
Will a new 50-gallon heater fit where my old one is?
Not always. Since the 2015 federal efficiency standard, tanks carry thicker insulation and run a couple of inches wider and taller than the ones they replace, which matters in an older closet. We measure before ordering, as we did for a Greenwood condo this winter, and where the footprint is tight a 40-gallon or a slimmer model does the job.
Is a heat pump water heater worth it in Seattle?
Often, yes. Seattle City Light pays a $750 rebate when an eligible residential customer installs a qualifying ENERGY STAR Tier 3 or 4 heat pump water heater, and the unit then uses a fraction of a standard electric tank's power. It needs air and a condensate drain, so a basement or garage suits it and a hall closet does not.
City Light allows one rebate per customer, paid through a participating contractor or by rebate form after a retail purchase, and the unit has to be on its list of qualified models.
Should I replace the water heater before it fails or wait?
Replace it on your schedule once it is past twelve years or showing the signs above. A planned swap is a half-day job with the model you chose; a failure is a wet floor, an emergency call and whatever tank is on the truck. In a condo it can also mean the unit below.
Same-day replacement is usually possible, but a planned one is always cheaper in damage.
What size water heater does a Seattle household need?
A 40-gallon tank suits one or two people or a condo with one bath; 50 gallons is the standard for a family home with two baths; larger households or big soaking tubs push to 65 or 80, or to tankless. Many older Seattle closets were sized for a 40, so a 50 may not fit without measuring first.
Find Out How Old Yours Is
The rating plate on the side of the tank carries the manufacture date in the serial number, and a photo of it is enough for us to tell you the age and quote the replacement. Call 425-245-7552 for a free estimate, or request a callback.
Related: water heater replacement in Seattle · water heater installation · water heater repair · tankless water heaters · a complete install in Mill Creek