Hot water usually stops suddenly because the pilot light or igniter failed on a gas heater, a breaker tripped or an element burned out on an electric heater, a thermostat failed, or the gas supply was interrupted. In multi-unit buildings, a central boiler problem can cut off hot water for everyone at once.
Rule Out Safety Problems
Before anything else, check for a gas smell and look for water around the tank. If you smell gas, leave and call your gas utility or 911 from outside. If the tank is leaking, close the cold-water valve and turn the heater off.
Gas Models
Most gas heaters have a small window near the bottom where you can see the pilot or burner. If there is no flame, the label on the heater explains how to relight it. If the pilot will not stay lit, a safety sensor called a thermocouple may be failing. Do not keep trying if it goes out repeatedly.
Electric Models
Check whether the heater’s breaker has tripped. Reset it once. If it trips again, leave it off, since that can mean an electrical fault. Elements and thermostats sit behind panels with live wiring, so testing them is a job for a professional.
Outside the Heater
If you live in an apartment or co-op, ask a neighbor whether they have hot water. If not, the building’s system may be down and management should arrange the repair. A gas utility outage can also affect gas heaters on the same street.
Age plays a role too. Many tank heaters last around 8 to 12 years, and a sudden failure is more likely near the end.
If the heater will not restart, a plumber can locate the failed part and restore hot water. If yours is aging, planning a replacement before winter avoids another cold surprise. Call JPR Plumbing at (833) 603-1840.