No Hot Water: What to Check

By the Emergency Plumber Carrollton team · Updated September 2026

Start With How Much Is Missing

There is a difference between no hot water at all and not enough of it, and the two point in different directions. If every tap runs cold, something has stopped the heater working: no power, no gas, a failed control or a tripped safety device. If the hot water is there but runs out after a few minutes, the heater is working and the problem is capacity, which usually means sediment in the tank or a failed lower element. If only one tap is cold while the rest are fine, the heater is innocent and the fault is at that fixture or its supply line. Working out which of the three you have takes two minutes and saves a lot of guessing.

Electric Heaters: the Safe Checks

On an electric heater, check the breaker panel first. A water heater usually has its own double breaker, and if it has tripped, that is worth knowing. Switch it off and back on once. If it trips again, stop there: something is drawing current it should not, and it needs testing rather than resetting. Many electric heaters also have a small red reset button behind an access panel, but opening that panel exposes live terminals, so it is not a check to make yourself unless the power to the unit is off at the breaker and you are confident about what you are doing. If in doubt, leave the panel closed.

Gas Heaters: Look, Do Not Adjust

On a gas heater, look through the sight glass or viewing window to see whether the pilot is lit. Check that the gas shutoff serving the heater is still in the open position, and check whether the control dial has been knocked to vacation or pilot. Those are all observations. Relighting a pilot, adjusting the gas control or dismantling a burner assembly is not a do-it-yourself task, and neither is anything involving the vent. If you smell gas at all, leave the house and call the gas utility before anyone else. A heater that keeps losing its pilot is telling you a part has failed, not that it needs lighting more often.

Sediment and Hard Water

North Texas water is hard, and the dissolved minerals in it settle in the bottom of a storage tank as a layer of scale. That layer sits between the burner or the lower element and the water, so the heater works longer for less hot water and the household notices the shower running cold sooner than it used to. A tank that rumbles, pops or ticks while heating is almost always full of sediment. Flushing it regularly is what prevents this, and it is one of the few maintenance jobs that genuinely extends the life of a heater here. A tankless unit has the same problem in a different form and needs descaling instead.

When It Is Not the Heater

A single cold tap is usually a mixing cartridge that has failed or clogged with scale, and that is a fixture repair rather than a heater one. A whole house that lost hot water at the same moment as a water pressure change may have an isolation valve partly closed. If you have a recirculation pump, a failed pump shows up as a long wait for hot water rather than none at all. And if the hot water went away the same week the water bill jumped, consider a leak on the hot side, which can be a line under the slab quietly running hot water into the ground.

Signs You Should Stop and Call

Water pooling around the base of the tank, rusty or brown hot water from every tap, a relief valve that is discharging, a burning smell, scorch marks near the vent, or a breaker that trips every time you reset it. Any of those means stop. So does a heater in an attic or an upstairs closet with water in the drain pan, because the ceiling below is next. Shut the cold water inlet valve at the top of the tank if you can reach it safely, leave the gas and the electrical supply alone, and get it looked at.

Water Heaters Around Carrollton

A lot of Carrollton housing dates from the 1970s to the 1990s, which means plenty of heaters have been replaced once or twice already and are sitting in attics, garages and hall closets of varying accessibility. The same is true across the area: in Coppell, subdivisions built in the 1980s and 1990s are reaching the point where original and first-replacement heaters give out within a few years of each other. Hard water affects all of them equally, regardless of the age of the house.

Arrange an Inspection

If the safe checks have not restored hot water, Emergency Plumber Carrollton can test the unit and quote the water heater repair before replacing anything. If the tank itself is leaking, read the repair versus replacement comparison so you know what a replacement should include, or describe the symptoms on the service request page. Ask for the price before the work starts.