How long does a water heater last in central Kentucky?

The short answer

A standard tank water heater lasts about 8 to 12 years. Tankless units run 15 to 20 with regular maintenance. Around Nicholasville, Lexington and the rest of the Bluegrass we see plenty of tanks fail closer to the 8-year mark, and the reason is almost always water quality.

Why our water is hard on heaters

Central Kentucky sits on limestone. Water picks up calcium and magnesium on the way to your tap, and when that water is heated the minerals drop out as scale. In a tank heater, scale piles up on the bottom, insulates the burner or element from the water, and makes the heater work harder for less hot water. That's the popping and rumbling you hear from an older tank.

Scale also chews through the anode rod — the sacrificial metal rod that's supposed to corrode so the tank doesn't. Once the anode is gone, the tank itself starts to rust from the inside, and a leaking tank can't be repaired.

Signs yours is near the end

Rusty or discolored hot water. Rumbling or popping when it heats. Moisture or rust around the base or fittings. Hot water that runs out faster than it used to. A heater past 10 years that needs a second repair. Any one of these is worth a look; two or more usually means it's time to plan a replacement on your schedule instead of waiting for a flooded floor.

How to make a heater last longer

Flush the tank once a year to clear sediment. Have the anode rod checked around year three to five and replaced when it's mostly gone — a $30 part that can add years. Keep the thermostat around 120°F. If your house has high water pressure (common in parts of Nicholasville and Lexington), a pressure-reducing valve and a properly set expansion tank take a lot of stress off the tank and its relief valve.

Repair or replace?

If the tank is under eight years old and the problem is an element, thermostat, gas valve or relief valve, repair is usually the right call. If the tank is leaking, or it's past ten years and needing parts, replacement is the better dollar. We'll tell you which one you're looking at before we quote anything.