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Guide · Layton, UT

Signs your water heater is failing.Leaks, rust, noise, smell, lukewarm showers, and age.

Spot a failing water heater early and plan a water heater replacement before the leak.

  • Leaks
  • Rust
  • Noise
  • Age

Background: Photo: Mcloward, Wikimedia Commons, CC BY-SA 4.0.

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Quick answer: The big signs are water under the tank, rusty hot water, popping or rumbling, a dripping relief valve, and age past 10 to 15 years.[1] Hard Layton water speeds up sediment.[2] Check the age from the serial number.[3]

Eight warning signs, and what they mean.

1. Water under the tank

With dry fittings, the tank body has likely failed. That means water heater replacement.

2. Rusty hot water

Rust only on the hot side points to the tank or a spent anode.

3. Popping or rumbling

Hard water sediment. Weber Basin's range of 10 to 18 grains makes it common here.[2]

4. Lukewarm water

A broken dip tube, a failed element, or sediment taking up room.

5. Rotten-egg smell

Often the anode rod reacting with the water.

6. Dripping relief valve

High pressure or heat. Never cap it.

7. Rust at the base or fittings

Corrosion on the outside often matches corrosion inside.

8. Age

Past about 10 to 15 years for a tank.[1]

Rust and corrosion on a water heater access plate, a warning sign of tank failure
Photo: Czarking0, Rusty water heater plate. Wikimedia Commons, CC0.
Read the serial number. The rating label on the tank has it. Rheem, Bradford White, and A.O. Smith each explain how to decode the date.[3][4][5]

Take the 5-question symptom check on the homepage, or go to water heater repair if the tank is young.

Sign by sign: repair or replace?

SignUsually points toNext step
Water under the tank, fittings dryTank body leakReplacement
Drip at a fitting or valveLoose or worn partRepair
Rusty hot water, older tankInner tank corrosionReplacement
Rusty hot water, young tankSpent anode or pipesCheck the anode
Popping or rumblingSedimentFlush, or replace if severe
Lukewarm waterDip tube, element, sedimentRepair on a young tank
Relief valve dripPressure or heat problemDiagnose soon
No hot waterPilot, element, or tankEmergency steps

Why Layton tanks wear out.

Layton blends city wells with Weber Basin water, depending on season and location.[6] Weber Basin says hardness can run 10 to 18 grains per gallon.[2] The USGS calls anything over 180 mg/L very hard.[7]

Minerals drop out as the water heats. They build a layer on the tank floor. The burner then has to heat through that layer, which wastes gas and stresses the steel.

Simple care that helps

  • Flush some water from the drain valve about once a year
  • Have the anode rod checked on older tanks
  • Test the relief valve the way the manual shows
  • Keep the area around a gas tank clear

A.O. Smith's maintenance guide and EPA WaterSense both cover routine water heater care.[8][9]

FAQ

Warning signs: FAQ

How do I tell how old my water heater is?

Read the serial number on the rating label. Rheem, Bradford White, and A.O. Smith each publish how to decode theirs.[3][4][5]

Is a little water under the tank normal?

No. Check fittings, the drain valve, and the relief pipe first. If those are dry, the tank itself is likely leaking.

Why does hard water matter for tank life?

Minerals settle as sediment and wear the tank floor. Weber Basin, part of Layton's supply, can run 10 to 18 grains per gallon.[2][6]

Should I replace a water heater before it fails?

If it is past about 10 to 15 years and shows signs, planning the swap is usually easier than an emergency.[1]

Is rusty hot water dangerous?

It is mostly a sign the tank or anode is corroding. It is a strong signal to have the tank checked.

Seeing these signs?

Describe them in the form. Get a free Layton water heater quote.

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Keep reading

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Sources

  1. PNNL / DOE Building America Solution Center: Gas-Fired Tankless Water Heaters
  2. Weber Basin Water Conservancy District: 2024 Consumer Confidence Report (PDF)
  3. Rheem: How to Locate and Read Your Rheem Water Heating Serial Numbers
  4. Bradford White: My Water Heater (determine age)
  5. A. O. Smith: Production date of my device
  6. Layton City Public Works: 2025 Water Quality Report (PDF)
  7. U.S. Geological Survey: Hardness of Water
  8. A. O. Smith: Water Heater Maintenance Guide
  9. U.S. EPA WaterSense: Home Maintenance
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