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How Long Do Water Heaters Last?

Tank water heaters last 8-12 years and tankless units 15-20. In Collin County, take 2-4 years off both numbers. Here's why, and how to tell where yours stands.

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Collin County Water Takes 2-4 Years Off Your Water Heater

The North Texas Municipal Water District, which serves McKinney, Allen, Plano, Frisco, and most of Collin County, delivers water at 14-18 grains per gallon depending on seasonal blending. Most water heater manuals are written for 7-10 grains per gallon.

At 17 grains, you're running the same appliance roughly twice as hard in terms of mineral accumulation. Scale coats the heating elements, sediment hardens on the tank floor, and the sacrificial anode rod that's supposed to corrode instead of your tank gets used up in 3-4 years instead of 6.

That's why a unit that would see 12 years in softer water often starts failing here around year 8. It isn't a defect and it isn't your fault. It's the water.

6 Signs Your Water Heater Is Near the End

Answer six questions and we'll tell you where your unit stands. Takes about a minute, and there's no diagnosis-by-guesswork — each answer maps to something we actually check on a service call.

Question 1 of 8

Is your water heater more than 8 years old?

Not sure? Check the serial number sticker — the first four digits are usually the month and year.

What Each Sign Actually Means

your water heater more than 8 years old

Tank heaters last 8-12 years on paper, but Collin County water runs 14-18 grains per gallon and takes 2-4 years off that. Past 8 years here, you are on borrowed time.

the hot water ever rusty, brown, or metallic-tasting

Rust-colored hot water means the tank is corroding from the inside. This is the one sign where we will tell you to replace rather than repair, every time.

the hot water run out faster than it used to

Scale from hard water builds on the heating elements and takes up space that used to hold hot water. The tank is the same size; the usable capacity is not.

you hear popping, rumbling, or banging from the tank

That is sediment hardened on the bottom of the tank, and the burner is now heating through it. It wastes gas or electricity and stresses the tank wall.

there any water pooling around the base

Treat this as urgent. A weeping tank is the stage before a rupture, and a 50-gallon tank letting go inside a house is a very different repair bill than a replacement.

it gone more than 3 years without a flush or anode rod check

Hard water depletes the sacrificial anode rod in 3-4 years instead of 6. Once it is gone, the tank itself is what corrodes next.

Flushing Is the Highest-Value Maintenance You Can Do Here

Because hard water is what's shortening these units, the maintenance that matters most locally is a periodic flush plus an anode rod check. On a tank heater in Collin County, that's worth doing every year or two rather than the every-few-years cadence the manual assumes. On a tankless unit, annual descaling isn't optional here — skipping it is the single fastest way to lose the 15-20 year lifespan you paid for.

None of that saves a tank that's already rusting from the inside. But on a unit that's still healthy, it's the difference between replacing at year 8 and replacing at year 12.

FAQ

Water Heater Questions We Get Most

Want Someone to Actually Look at It?

We inspect the unit, explain what we find, and give you a written quote before any work starts. If a repair isn't worth it, we'll tell you that too.