No Hot Water: How To Diagnose It
Short answer
Start with power or fuel: check the breaker for an electric heater, or the pilot and gas supply for a gas unit. If those are fine, the likely causes are a failed thermostat, heating element, thermocouple, or igniter.
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Quick checks
- Electric: check the dedicated breaker and the reset button on the unit.
- Gas: confirm the pilot or igniter and that the gas valve is on.
- Tankless: check for an error code on the display.
- Confirm the problem is at every fixture, not just one (a single fixture points to a cartridge or valve).
When to call
Call a professional if the breaker trips repeatedly, if the pilot will not stay lit, if there is a gas smell, or if you get lukewarm water that runs out quickly — that pattern often indicates a failed element or heavy sediment.
Frequently asked questions
Why do I run out of hot water so fast?
Common causes are sediment reducing tank capacity, a broken dip tube mixing cold into the hot outlet, one failed element in a dual-element electric heater, or a unit that is undersized for current demand.
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