Water Heater Installation in Mount Vernon, WA
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Mount Vernon asks a water heater to run nearly all year
Homes here need heat from September through July, 11 months a year. Your water heater is part of that. It's drawing in groundwater that starts out cold on winter nights averaging 30°F, and it gets little time off to recover.
A new storage water heater has to clear a federal minimum efficiency, but that minimum isn't one number. It's set by a formula tied to the tank's rated volume, applied separately across four draw patterns, so two tanks of different sizes face different minimums. Whoever installs yours needs to size it to your household and check that the unit clears the minimum for that size, not just for water heaters in general.
- 30°F
- the average winter night, and colder incoming water means longer heating
- 11 months
- September through July, 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
- How do I know it's time to replace my water heater?
- The clearest sign is age, since older tanks are far more likely to leak than to keep working. Rust colored water from the hot tap, rust on the outside of the tank, or water pooling underneath all mean the tank itself is failing rather than something a repair can fix. If it's taking noticeably longer to get hot water, or you hear rumbling or popping from the tank, sediment has built up on the bottom and the heater is working harder than it should. Once you see any of these signs, replacing the unit is usually cheaper in the long run than waiting for it to fail outright.
- Should I switch to a tankless water heater?
- It depends on what you want out of it, not on whether your current tank is failing. A tankless unit heats water on demand instead of storing it, so you don't run out partway through back to back showers the way you can with a tank. It also tends to last longer than a storage tank, since there's no standing reservoir to corrode from the inside. What it won't do is fix a water pressure problem or make hot water arrive faster at a far away faucet, since that's about the pipe run, not the heater. A contractor can look at your gas line, venting, and where the unit would go and tell you whether a switch makes sense for your house.
- What changes when you install a tankless water heater?
- The biggest change is that a tankless unit needs more gas flow the moment it fires up, since it's heating water instantly rather than drawing down a tank that was heated ahead of time. That often means a larger gas line than what feeds a storage tank, and it always means different venting, since tankless units vent through the wall or roof rather than through a standard flue. The unit itself mounts on the wall and takes up a fraction of the floor space a tank does, which matters if you're trying to free up a closet or utility room. Because the gas line, venting, and mounting are all different from a tank setup, this isn't a swap you do without a contractor looking at what your house can support first.

