Real lifespans by type, what Portland’s soft water does to an anode rod, and the point at which replacing beats repairing.
The short answer is eight to twelve years for a tank. The more useful answer is that where a particular tank lands in that range is decided almost entirely by one $40 part most people have never heard of.
| Type | Typical life | What usually ends it |
|---|---|---|
| Gas tank | 8–12 years | Tank liner corrodes after the anode rod is consumed |
| Electric tank | 10–13 years | Same — though elements often fail first and are repairable |
| Heat pump (hybrid) | 10–15 years | Compressor, or the tank as with any other tank |
| Gas tankless | 20+ years | Heat exchanger, if descaling was neglected |
Inside every tank water heater is a sacrificial anode rod: a length of magnesium or aluminium that corrodes instead of the steel tank. It is doing its job by dissolving. When it is gone, the corrosion moves to the tank.
Portland's water comes from the Bull Run watershed and is unusually soft and low in mineral content. That is good news for scale — tankless heat exchangers foul more slowly here than almost anywhere — but soft, low-mineral water is more aggressive toward a sacrificial anode. Rods go faster here than the national guidance assumes.
Have the anode rod checked at around year four and replaced if it is more than about 60% consumed. It is roughly $40 of part, and it is the difference between a tank that reaches twelve years and one that fails at eight.
The first two are repairable and worth acting on. The third is the warning that the clock has started. The last two are a replacement.
Look at the rating plate on the side. The serial number encodes the manufacture date — most brands put the year and week in the first four characters, though the exact scheme differs by manufacturer. If you cannot decode it, read it to us on the phone and we will tell you.
If it is over ten and still working, that is not a crisis — but it is the moment to plan rather than react. A scheduled replacement costs exactly what an emergency one costs, minus the flooded floor.
Eight to twelve years for a tank, ten to fifteen for a heat pump, twenty or more for a tankless unit that is descaled. Portland's soft Bull Run water is easy on scale but hard on anode rods, and the rod is usually what decides where in that range a tank lands.
The serial number on the rating plate encodes the manufacture date. Most brands put the year and week in the first four digits, though the format varies by manufacturer.
Past ten years, yes, if you can plan it. A scheduled replacement costs the same as an emergency one and does not come with a flooded floor.
No diagnostic fee, no trip charge, and a flat-rate price in writing before anything starts. If it is no hot water today, calling is faster than the form.
A real diagnosis and a flat-rate price in writing, anywhere in Portland, at no cost.