Water Heater Leaking in Las Vegas? What to Do First

If your water heater is leaking, shut off the cold water supply valve above the tank and turn off the gas or the breaker, then find exactly where the water is coming from. A leak from a valve or a pipe connection can usually be repaired, but a leak from the steel tank itself means the water heater has to be replaced.

That distinction decides what the fix costs and how urgent it is, and you can usually narrow it down yourself in a few minutes with a flashlight and a dry towel.

Shut These Off First

Work through these in order before you try to diagnose anything:

1. Close the cold water supply. The shutoff valve sits on the cold line running into the top of the tank. Turn it clockwise until it stops. This stops the tank from refilling, which limits how much water can reach the floor.
2. Cut the energy source. On a gas unit, turn the control knob to the off position. On an electric unit, switch off the water heater's breaker at the panel. Heating an emptying tank damages the burner or the elements.
3. Protect the area. Move stored boxes, tools and anything else off the floor around the tank, and put down towels to keep water from wicking under walls or into the house.
4. Leave the drain valve alone. The water inside may still be scalding. Draining waits until the tank has cooled, and is usually done by the plumber making the repair.

Find Where the Water Is Coming From

Dry every surface with a towel, then watch and feel for where fresh water appears. Check from the top of the tank down.

• Top of the tank: the cold inlet and hot outlet connections, and the flexible lines attached to them.
• Side of the tank: the temperature and pressure (T&P) relief valve and the discharge pipe running down from it.
• Bottom of the tank: the drain valve near the base, or the tank body itself.

Water pooled at the base does not always mean the bottom is leaking. Water runs downhill, so a slow drip from a top connection can travel down the outside of the tank and collect underneath. Finding where the water first appears matters more than where it ends up.

One thing that is not a leak: A. O. Smith notes that "a gas water heater may produce condensation the first time it is lit," and that "this condensation is normal and goes away once the water heater reaches its normal operating temperature." If a new unit sweats for a short while after installation and then stops, that is expected behaviour, not a failure.

Leaks You Can Usually Repair

Most leaks do not come from the tank. A. O. Smith, one of the largest water heater manufacturers, states plainly that "most leaks are caused by faulty water supply connections." These are the repairable ones:

Supply connections. Loose fittings, corroded nipples and worn flex lines on top of the tank can be tightened or replaced without touching the water heater itself.

The T&P relief valve. This valve opens to protect the tank when temperature or pressure climbs too high. If it is dripping from the discharge pipe, the valve may be worn out, or it may be doing its job and venting a system that is over pressure. That second possibility is common across the valley, and it is covered in our guide to high water pressure in Las Vegas homes. Replacing the valve without checking pressure often just brings the drip back.

The drain valve. The valve at the base of the tank can weep at its threads or fail to close fully, particularly when sediment lodges in the seat. It is a replaceable part.

When the Tank Itself Is Leaking

If water is coming through the steel shell, whether from a seam, from rust on the tank wall, or from underneath with every fitting dry, the tank has corroded from the inside. That cannot be patched. A tank water heater typically lasts 8 to 12 years, and a leak through the shell is the clearest sign one has reached the end.

Do not treat a small tank leak as something to monitor. Corrosion does not reverse, and a weeping tank can fail suddenly once the metal gives way. Plan the replacement now, while you still get to choose the unit and the timing. For some homes that is also the moment to consider a tankless water heater instead of a like-for-like tank.

Why Las Vegas Tanks Leak Early

The valley's hard water is the main reason. A. O. Smith explains that "hard water contains a higher concentration of minerals, increasing the risk of sediment accumulation inside your water heater," and advises that "if you live in a hard water area, you may need to flush your water heater more often."

That sediment settles on the bottom of the tank, where it traps heat, stresses the steel and speeds up the corrosion that eventually turns into a leak. The same minerals clog drain valve seats, which is why drain valves here often weep after a flush. Our post on hard water damage in Las Vegas covers the wider effect on your plumbing.

Prevention is simple and cheap next to a flooded garage. The manufacturer's baseline is that "most types of tank water heaters require flushing at least once per year," and it recommends "inspecting the anode rod once a year." The anode rod is the sacrificial metal rod that corrodes in place of the tank. Once it is used up, the tank starts corroding instead. In hard water, it pays to treat those intervals as the minimum.

Placement matters too. Many valley homes keep the water heater in the garage, where a slow leak can go unnoticed for weeks behind stored boxes, so glance at the base of the tank whenever you pass it.

Getting It Fixed

Once the water is off and you know roughly where the leak is, get a proper diagnosis. A valve replacement and a new water heater are very different bills.

American Brothers Plumbing has served Las Vegas, Henderson and the surrounding Clark County communities for over 20 years. Same-day service is often available, and we will tell you honestly whether your unit is worth repairing before giving you a free estimate. See our water heater repair and installation service, or call (702) 704-1776.

Source: A. O. Smith, Water Heater Maintenance Guide