Why Do I Have No Hot Water?
No hot water is usually caused by a pilot light that's gone out (gas heaters), a tripped circuit breaker (electric heaters), failed heating elements, or sediment buildup in the tank. Check your pilot light or breaker first. If those are fine and you still have no hot water, the problem likely requires professional repair.
Common Causes
Pilot Light Is Out (Gas Water Heaters)
The most common cause for gas water heaters. The pilot light can go out due to drafts, a dirty thermocouple, or a faulty gas valve. Check the viewing window, you should see a small blue flame.
Tripped Breaker or Blown Fuse (Electric Water Heaters)
Electric water heaters can trip their dedicated circuit breaker, especially during power surges common in Phoenix monsoon season. Check your electrical panel for a tripped breaker.
Faulty Heating Element
Electric water heaters have one or two heating elements that can burn out over time. Phoenix's hard water accelerates element failure due to mineral buildup. If you have lukewarm water, usually one element has failed.
Sediment Buildup
Phoenix's hard water deposits minerals at the bottom of your tank, insulating the water from the heating element or burner. This reduces efficiency and eventually prevents proper heating. Annual flushing prevents this.
Broken Dip Tube
The dip tube directs cold incoming water to the bottom of the tank. If it breaks, cold water mixes with hot water at the top, resulting in lukewarm water from your faucets.
Thermostat Failure
Water heaters have thermostats that control heating. If these fail, the unit won't know when to heat. Electric heaters have separate upper and lower thermostats; either can fail independently.
What Should You Do?
Try This First
- Check if the pilot light is lit (gas heaters) or if the breaker is tripped (electric heaters)
- Verify the thermostat is set to 120°F (the recommended setting)
- Check if hot water works at any fixture, if only some fixtures are affected, it may be a different issue
- Listen for sounds from the water heater, rumbling can indicate sediment buildup
Call a Pro If...
- You smell gas near your water heater (leave immediately and call 911)
- The pilot light won't stay lit after multiple attempts
- You've reset the breaker but it keeps tripping
- The water heater is more than 8-10 years old and never been serviced
- You see water pooling around the base of the unit
- There's rusty or discolored hot water coming from faucets