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Water heater repair in Las Vegas

Most water heater problems here trace back to the same thing: very hard water leaving scale in the tank. Start with the symptom, check the cheap fixes, and call someone when the problem is gas, a leak from the tank body, or anything you cannot see clearly.

Check these before you call anyone

Electric: look at the breaker, then the red reset button behind the upper element panel. A tripped reset button usually means a failed element or thermostat, not a fluke.
Gas: is the pilot lit? Is the gas control knob on PILOT or ON, not OFF? Is the gas supply valve open?
Thermostat setting: someone may have turned it down. Around 120 degrees F is the usual home setting.
Cold water valve: it should be fully open.
Other taps: if only one fixture is cold, the heater is fine and the problem is a mixing valve or cartridge at that fixture.

If you smell gas, leave the house and call Southwest Gas from outside. Do not relight anything.

Repair by symptom

No hot water

Gas heaters: a pilot that is out, or a thermocouple that no longer senses the flame, is the most common cause. Electric heaters: a failed heating element or a tripped high-limit switch. Both are small repairs on a heater that is otherwise healthy. Our no hot water checklist goes step by step, and the pilot light guide covers relighting.

Not enough hot water, or it runs out fast

Sediment takes up room in the tank and insulates the water from the burner. On electric tanks, a single dead element cuts the output sharply. Flushing the tank helps the first problem; a new element fixes the second.

Popping, rumbling or banging

Water trapped under a layer of scale is boiling and escaping. The tank is working hard. A flush can quiet it if the scale is still loose. If the noise comes back within weeks, the scale has hardened and the tank is likely near the end of its life.

Rotten-egg smell from the hot water only

Sulfur-reducing bacteria can live in a warm tank and react with the anode rod, producing hydrogen sulfide gas. If the smell is only on the hot side, the heater is the source. Flushing the tank and replacing or swapping the anode rod often clears it. If the smell is on both hot and cold, it is not the heater. If it smells like gas rather than eggs, treat it as a gas leak and leave.

Leaking

Where the water comes from decides the repair. A drip at the T&P valve, a pipe fitting or the drain valve can be fixed. Water seeping from the tank body or the bottom jacket cannot. Shut off the heat and the cold water supply first, then read what to do when a water heater leaks.

Rusty or brown hot water

If only the hot taps run brown, the tank is corroding from the inside, often because the anode rod is spent. A new rod can slow it down if caught early. Once the tank wall is rusting through, replacement is the answer.

The parts that fail most often

Anode rod: A metal rod that corrodes so the tank does not. In hard water it is consumed faster. Checking it every few years and replacing it when it is mostly eaten away is the cheapest way to extend a tank's life.
Thermocouple (gas): Senses the pilot flame and holds the gas valve open. When it weakens, the pilot drops out. Often a quick swap.
Heating elements and thermostats (electric): Scale coats the lower element until it burns out. Elements and thermostats are replaceable parts.
T&P (temperature and pressure relief) valve: A safety valve that opens if the tank gets too hot or too pressurized. Plumbers test it by lifting the lever briefly with a discharge pipe in place. A valve that drips constantly may be failing, or may be telling you the water pressure is too high or the expansion tank has failed. Never cap or plug it.
Drain valve: Plastic ones crack and clog with scale. They can be swapped for a brass one.
Gas control valve: The expensive part on a gas heater. When this fails on an older tank, replacing the whole heater often makes more sense.

Flushing the tank, the maintenance that matters here

Las Vegas water is classed as very hard, and a tank heater collects scale all year. Draining a few gallons from the drain valve removes loose sediment, and many plumbers recommend a full flush about once a year in hard water. Turn off the gas or the breaker first, close the cold supply, open a hot tap upstairs, and run the drain valve to a hose outside. If the water coming out is full of gritty flakes, the tank has been neglected, and a stuck drain valve is common. See how hard water affects your heater.

Gas water heater repair

Gas heaters add a few faults electric ones do not have. The common ones are a pilot that will not stay lit (usually a worn thermocouple or a dirty pilot assembly, see the pilot light guide), a failing gas control valve, a sooty or yellow burner flame, and a vent or draft problem that lets exhaust spill into the room. Soot, a yellow flame, or a burning smell near the heater mean stop and get it looked at.

The thermocouple and pilot parts are small repairs. The gas control valve and anything involving the gas line or vent are licensed work. If you smell gas, leave the house and call Southwest Gas from outside. Do not relight anything.

When to repair and when to replace

Repair makes sense when the heater is under about 8 years old, the leak is at a fitting and not the tank, and the part that failed is a known wear item such as an element, thermocouple or thermostat. Replace when the tank itself leaks, the unit is past 10 to 12 years, or repair costs are climbing toward half the price of a new heater. The replacement guide covers what a new install involves here.

When to call a licensed plumber

Any smell of gas, or a pilot that will not stay lit after a fresh relight
Water from the tank body, or a T&P valve discharging steadily
Scorched or sooty marks around the burner compartment or the flue
Anything that opens gas lines or the vent
Any repair you are not sure you can finish safely

Living in Henderson? See water heater repair in Henderson.

Plumbing contractors in Nevada are licensed through the Nevada State Contractors Board. You can look up a license number on the board's website before you hire.

Common questions

What is the most common water heater repair in Las Vegas?

Hard-water scale causes most of them: failed lower elements on electric heaters, noisy and inefficient tanks from sediment, and drain valves that clog. On gas heaters, thermocouples and pilot assemblies are the usual culprits.

How do I know if my water heater needs repair or replacement?

Age and leak location decide it. A fitting or valve leak on a heater under about 8 years old is usually a repair. Water coming from the tank body, or a unit past 10 to 12 years with repeated problems, usually means replacement.

Why does my hot water smell like rotten eggs?

If the smell is only on the hot side, bacteria in the tank are reacting with the anode rod. Flushing the tank and replacing or changing the anode rod often fixes it. If you smell gas rather than eggs, leave the house and call Southwest Gas.

Is it safe to flush a water heater myself?

Many homeowners do. Turn off the gas or breaker first, let the water cool, and drain to a hose outdoors. If the drain valve will not open or clogs, stop and call a plumber instead of forcing it.

Why is my water heater making popping or rumbling noises?

Scale has built up on the bottom of the tank and water trapped underneath is boiling. Flushing may help if the sediment is loose. If it returns quickly, the tank is likely near the end of its life.

Sources: Las Vegas Valley Water District: water quality FAQs · Nevada State Contractors Board