Water Heater Installation in Seattle, WA
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What a new water heater here has to meet
Winter nights in King County average 32°F from December through February. Ten months of the year, September through June, homes here are running heat, and the water coming into your tank starts out cold right along with it.
A new storage water heater also has to clear a federal efficiency minimum, and that minimum isn't one number. It's a formula based on the tank's rated volume, applied differently across four draw patterns, so two tanks of the same type can face different standards depending on size. Sizing the tank and meeting that minimum are the same decision, not two separate ones.
- 32°F
- the average winter night, and colder incoming water means longer heating
- 10 months
- September through June, the months homes here need heat
- 23%
- of Washington households lost power for a day or more in 2024, and a heater with an electric element or electric ignition stops without it
NOAA nClimDiv, 1991–2020 normals
A heat pump water heater would save about $280 a year to run in Washington compared with an electric water heater.
Estimates for a typical Washington home, from EIA household energy data and Washington fuel prices. Your home will differ.
- How do I know it's time to replace my water heater?
- Age is the first thing to check. Tank water heaters have a working life, and once one is old enough, a repair often just delays the next problem. Rust colored water, a tank that's rusting or bulging on the outside, or water pooling underneath are signs the tank itself is failing, and a leaking tank can't be repaired. If it's still making hot water but taking longer to recover between uses, or making popping and rumbling noises, sediment has likely built up at the bottom, which is common as a tank ages. A contractor can check the anode rod and tank condition and tell you whether it's worth repairing or time to replace.
- Should I switch to a tankless water heater?
- It depends on what you want out of it. A tankless unit heats water only when you're running a tap or appliance, so it doesn't hold a tank of hot water waiting, and it won't run out the way a tank can when several showers or loads happen back to back. It takes up less space than a tank and typically lasts longer. The tradeoff is that tankless units often need a gas line upgrade or higher electrical capacity to deliver hot water fast enough, so the install is more involved than swapping one tank for another. A contractor can look at your gas line, venting and electrical setup and tell you what switching would actually require in your house.
- What changes when you install a tankless water heater?
- The unit itself is smaller and mounts on a wall instead of standing on the floor, so where it sits in your house usually changes. Venting changes too, since tankless units need venting rated for their exhaust, which is often different from what a tank used. Gas fired tankless units draw more gas at once than a tank does, so the gas line sizing gets checked and sometimes upsized. Electric tankless units draw enough power that a home's electrical panel may need more capacity to run one. A contractor will look at your gas line, vent path and panel before installing to confirm what your house needs.