How to Fix a Water Heater With No Hot Water
Waking up to no hot water is a shock. Before calling a plumber, there are several simple fixes to try. The cause depends on whether you have a gas or electric water heater — and some fixes take under 10 minutes.
Likely Causes
- 1Tripped circuit breaker (electric heaters)
- 2Pilot light out (gas heaters)
- 3Faulty heating element (electric heaters)
- 4Thermostat set too low or failed
- 5Sediment buildup in the tank reducing efficiency
- 6Water heater at end of life (10–15 years)
Not a safety emergency unless you smell gas. If you smell gas, leave immediately and call the gas company.
How to Fix It: Step by Step
- 1Check the circuit breaker
For electric heaters, go to your electrical panel and look for a tripped breaker labeled 'Water Heater.' Reset it by switching it fully off, then back on.
- 2Relight the pilot (gas heaters)
Turn the gas valve to 'Pilot.' Press and hold the pilot button while using a lighter or igniter at the pilot burner. Hold for 60 seconds after it lights, then turn the valve to 'On.'
- 3Check the thermostat settings
Most water heaters have two thermostats (upper and lower) accessible behind panels. Set both to 120°F. If either feels hot to the touch but the other doesn't, that element has likely failed.
- 4Test for a bad heating element
Turn off power to the heater. Use a multimeter to test each element for continuity (resistance of 10–30 ohms is normal). A reading of 0 or infinity means the element needs replacement.
- 5Flush sediment from the tank
Connect a hose to the drain valve, turn off cold water supply, and drain 2–3 gallons. Sediment buildup insulates the water from the heating elements.
Materials & Tools Needed
Warning Signs It's Getting Worse
- ⚠Popping or rumbling sounds from the tank (severe sediment)
- ⚠Discolored or rusty water from hot taps
- ⚠Water pooling around the base of the heater
- ⚠Heater runs continuously without reaching temperature
When to Call a Professional
Call a plumber if the heater is over 12 years old and failing repeatedly, if you see corrosion around fittings, if the tank is leaking, or if you smell gas near a gas heater.
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