Why Do I Have No Hot Water?
By the Duncan Family Plumbing team · August 26, 2026
No hot water usually points to one of a few things: on a gas heater, the pilot light or gas supply; on an electric heater, a tripped breaker or a burned-out heating element; or on either, a failed thermostat or a tank at the end of its life. A quick check tells you which.
Start With the Simple Checks
Before anything else, make sure the water heater has power or gas. For an electric unit, check the breaker. For a gas unit, look at the pilot light. If the breaker keeps tripping or the pilot won’t stay lit, that’s your clue.
Common Causes of No Hot Water
- Gas heater: A pilot light that’s out, a faulty thermocouple, or an interrupted gas supply.
- Electric heater: A tripped breaker or a failed heating element — a very common cause of suddenly cold water.
- Either type: A broken thermostat, sediment buildup in the tank, or simply an old unit that’s worn out.
When It’s the Tank Itself
Most tanks last 8 to 12 years. If yours is in that range and you also see rusty water, popping sounds, or water around the base, replacement is usually the smarter move than another repair.
When to Call a Plumber
If the simple checks don’t bring back hot water, or you smell gas, stop and call. Gas work and electrical elements aren’t safe DIY territory. We can diagnose it fast and often replace a failed unit the same day.