Why is my water heater ___?

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
Emergency
Smell gas, see smoke, hear sparking, or have a carbon-monoxide alarm? Leave the house immediately. Call 911 or your gas utility from a safe location. Do not operate switches or attempt a repair.
Browse by category
No Hot Water & Temperature
No hot water, lukewarm water, water too hot, or hot water running out fast.
Leaks & Water Pressure
Water on the floor, dripping valves, weak hot-water pressure.
Noises
Popping, rumbling, hissing, whistling, banging, ticking or humming.
Gas, Pilot Light & Combustion
Pilot light problems, burner faults, gas odors and venting concerns.
Electric Water Heater Problems
Tripped breakers, reset buttons, elements and thermostats.
Efficiency, Costs & Maintenance
High bills, short lifespan, flushing, anode rods and upkeep.
How the diagnosis works
Step 1
Find the symptom
Choose the exact problem you are experiencing.
Step 2
Run the quick tests
Follow safe checks that take less than 10 minutes.
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
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