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Why is my water heater ___?

Homeowner thinking about a water-heater problem

Finish the sentence. You get ranked causes, a self-test you can do in minutes, an urgency rating, and what the fix actually costs — DIY and professional.

45 diagnosis guides · Every cause ranked by likelihood · Sources cited

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How the diagnosis works

  1. Step 1

    Find the symptom

    Choose the exact problem you are experiencing.

  2. Step 2

    Run the quick tests

    Follow safe checks that take less than 10 minutes.

  3. Step 3

    Choose the right fix

    Compare DIY costs, professional costs, urgency, and repair options.

Built on published safety standards

Every guide is written against public standards and manufacturer service literature, then reviewed before publication.

  • U.S. Department of Energy
  • ENERGY STAR
  • Consumer Product Safety Commission
  • Environmental Protection Agency
  • Centers for Disease Control and Prevention
  • National Fire Protection Association
  • International Plumbing Code
  • Uniform Plumbing Code
  • AHRI
  • Manufacturer installation and service manuals
  • Established plumbing and water-heater trade references
How we research

Still not sure what's wrong?

Some water-heater problems need eyes on the unit. If your checks were inconclusive, you can describe the symptom and we'll point you to a licensed water-heater professional in your area.

Talk to a licensed water-heater pro