6 Signs Your Water Heater Is About to Fail

Shoresteady Plumbing technician repairing pipes

Water heaters usually warn you for six to twelve months first. Rumbling, rusty hot water, puddles, short showers, swinging temperature, and age, in the order they appear.

Water heaters rarely fail without warning. They usually spend six to twelve months telling you, and most people only hear it the morning there is cold water and a wet floor. These are the signs worth acting on, in the order they normally appear.

Act now if: there is water on the floor around the base, the tank is over twelve years old, or the hot water has turned rusty. Any of those three means plan a replacement rather than wait for one.

1. Rumbling, popping, or a kettle sound

That is sediment. Minerals settle on the bottom of the tank, water gets trapped underneath and boils through it. Aside from the noise, the burner or element is now heating a layer of rock instead of water, which wastes energy and stresses the steel. An annual flush prevents it. Once the noise is loud, the damage is usually already done.

2. Rusty or metallic hot water

If only the hot side runs orange, that is the inside of the tank. It means the glass lining has failed and the anode rod is gone. Once you can see the rust, the tank is on borrowed time. Run the cold tap to check: if cold runs clear and hot does not, it is the heater and not the pipe.

3. Water around the base

Check where it is coming from before you panic. A drip at a flex line or the relief valve is a repair. Water weeping from the body of the tank is not repairable. There is no patch for a rusted through cylinder, and the failure mode is a sudden release of forty gallons, not a slow drip forever.

4. Hot water running out faster than it used to

Sediment reduces the usable volume of the tank. A 50 gallon heater with four inches of sediment behaves like a 35 gallon one. If you used to get two showers and now get one and a half, and nothing else in the house changed, that is the tank.

5. Temperature swinging around

Hot then cold in the same shower usually points to a failing thermostat, a partly burnt out element, or on gas a dying control valve. Individually these are $175 to $600 repairs and worth doing on a heater under eight years old. On a twelve year old tank they are the polite warning.

6. Age

Find the serial number on the data plate. Most manufacturers encode the year in the first four characters. Ten to twelve years is a normal life on decent water, and eight or less on untreated well water with iron or hardness. Past twelve, you are not maintaining a heater, you are waiting on one.

Why Shore water is hard on heaters

Most of the county is on private wells, and a lot of that water carries iron, manganese, or hardness. All three shorten anode life and build sediment faster. If your last two heaters both died young, the heater is not the problem. Treating the water is cheaper than replacing heaters early, and the numbers are in what a water treatment system costs.

Questions We Get Asked About Failing Water Heaters

Can a leaking water heater be repaired

If the leak is at a fitting, valve or connection, yes. If it is weeping from the tank body, no. That tank has rusted through and it needs replacing.

How do I find the age of my water heater

The serial number on the data plate usually encodes the manufacture date in its first four characters. Send us a photo and we will read it for you.

Is it worth replacing the anode rod

On a heater under about six years old, yes, and it is one of the cheapest things you can do to extend its life. On a ten year old tank, put the money toward the replacement.

Should I replace before it fails

If it is past ten years and sits above a finished floor, yes. Replacing on your schedule costs the same as replacing on its schedule, minus the water damage and minus the cold showers.

What does replacement cost

Typically $1,800 to $3,600 installed on the Shore. The breakdown is in what water heater replacement costs.

Get it looked at before it picks the date

See our water heater page or request service.

Written by the team at Shoresteady Plumbing, Temperanceville, Virginia. Master plumbing licensed in Virginia and Maryland. Prices shown are typical ranges for the Eastern Shore, not a quote. Your written estimate is the only number that binds either of us.

Reading about it is one thing, fixing it is another

Tell us what is going on and we will get you on the schedule. Written estimate before we start, and a 2-year workmanship guarantee on every job.

Explore related services

Ready for a steady hand?

Book with our team, or call us seven days a week from 8am to 9pm.

Call (757) 824-9862

Six Signs Your Water Heater Is About to Fail