How to flush a water heater in Abilene (and why hard water makes it urgent)

The City of Abilene says our water averages about 240 milligrams per liter of hardness, which works out to roughly 14 grains per gallon. Every time your tank heats, some of those minerals drop out of the water and settle on the bottom as sediment, right where the burner or lower element does its work. Flushing is how you get it out before it hardens. It's a job a handy homeowner can do, as long as you know where it goes wrong.

The short answer: turn off the power or gas and the cold water inlet, hook a hose to the drain valve, open a hot tap, and drain the tank until the water runs clear. Refill it fully before the heat comes back on. Do it yearly in Abilene, and if the drain valve sticks or leaks, call a plumber.

Is flushing a water heater a DIY job?

Mostly, yes. The steps are simple, but you're working with hot water, a gas or electric appliance, and a drain valve that may not have moved in years. A. O. Smith, one of the big tank makers, says to wear thick gloves and safety goggles and to turn the heater off a few hours before you drain it. Energy Trust of Oregon suggests letting it cool overnight. Don't start on a tank that's hot from this morning's showers.

You'll need a garden hose, a bucket, a flathead screwdriver, towels, and gloves. Keep the manual or at least the label on the tank handy. Models differ, and the manufacturers all say to follow yours.

How to flush a water heater, step by step

1. Turn off the heat. On an electric heater, flip the breaker. On a gas heater, turn the gas control dial to OFF.
2. Let it cool. A few hours at minimum, overnight is better. Water coming out of that hose can scald.
3. Shut the cold water inlet on the pipe at the top of the tank.
4. Hook up the hose. Thread a garden hose onto the drain valve near the bottom of the tank, with the valve still closed. Run the other end to a floor drain, or outside to a spot that hot water won't hurt.
5. Open a hot faucet in the house. It lets air into the tank so it drains. Rheem also says to open the pressure relief valve here; if your manual says the same, lift its lever.
6. Open the drain valve, by hand or with a flathead screwdriver, and let the tank empty.
7. Stir up what's left. With the drain still open, turn the cold inlet back on and flush until the water runs clear. If the flow slows to a trickle, sediment is plugging the valve. Don't poke at it. A. O. Smith says to call a plumber if sediment blocks the valve.
8. Close up and refill. Close the drain valve, take the hose off, and make sure the valve isn't dripping. With the hot tap still open, let the tank fill until the water runs steady. Air will sputter out first. A. O. Smith says to run the hot tap at least three minutes.
9. Power or gas goes back on last. Only after hot water is running steady at the tap. On an electric heater, the breaker stays off until the tank is full. On gas, relight the pilot following the label on the heater.

Put the hose on before you touch the drain valve. A valve nobody's opened in years is the part most likely to turn a free chore into a service call.

That tip comes from Montana State University Extension: a drain valve that hasn't been opened in years can be hard to close again, and a hose gives the water somewhere to go if it fights you.

What the water coming out is telling you

• Clear after a short run. The tank was in decent shape. Close it up.
• Cloudy, gritty, or full of white and tan flakes. That's mineral scale, the stuff hard water leaves. Keep flushing until it clears.
• Rusty-brown water that won't clear. It can mean the tank itself is corroding, and a flush won't fix that. Our guide to water heater failure signs covers what to do next.
• The tank still rumbles after a flush. Sediment that's been there for years bakes into a layer a flush can't pull out. The noise is the tank telling you it's working harder than it should.

How often to flush in Abilene

Manufacturers don't agree on one number, and that's fair, because it depends on your water. Rheem says once a year as a standard, and every six months for hard water. Montana State University Extension says some areas need monthly flushing and others once a year, depending on hardness. Abilene's water isn't soft. We'd treat once a year as the minimum, and our hard water guide explains what those minerals do to the rest of your house.

When to stop and call a plumber instead

• The drain valve won't open, won't close, or drips afterward. Rheem says to call a professional if the valve won't open or is leaking, and A. O. Smith says the same when sediment blocks it. Don't force it.
• The tank has never been flushed, or it's over 10 years old. Rheem warns that flushing hardened sediment yourself could lead to leaks or further damage, and Energy Trust of Oregon says flushing an older tank can expose bigger problems. If that happens, our repair-or-replace guide helps with the next call.
• Gas or electrical parts make you nervous. That's a good reason to hand it off.
• Water is pooling at the base of the tank. That's a leak, not a maintenance problem. Shut off the cold water inlet and call our 24/7 emergency line.

Let us flush it every year

The Double R Home Care Plan ($299 a year or $29 a month) includes a yearly water heater flush, our annual 32-Point Home Inspection, priority scheduling, and 10% off repairs. We track your service date and remind you, so it actually happens. Anything outside the plan, we'll quote before we start. See our water heater service page for everything else we do on tanks.

We're owner-operated and licensed in Texas as a Master Plumber (M-18761). Real work, real people, no corporate runaround.

Call or text (325) 701-7017 or request service online.

Frequently asked questions

Can I flush my water heater myself?

Usually, yes. A garden hose, a bucket, and about an afternoon of mostly waiting is all it takes on most tank heaters. Where it goes wrong is the drain valve. Rheem says to call a pro if it won't open or is leaking, A. O. Smith says the same if sediment blocks it, and Rheem warns that flushing hardened sediment yourself could lead to leaks or further damage. If you're not comfortable around the gas or electric side, hand it off.

Is it too late to flush a water heater that's never been flushed?

It's not too late to ask, but it's a bad one to start on your own. Sediment that's sat for years bakes into a layer a hose won't pull out, and Energy Trust of Oregon warns that on a tank over 10 years old, draining and flushing can expose other, more serious problems. Have a plumber look at it first, and it's a fair time to ask whether the tank has years left.

Will flushing fix the rotten-egg smell in my hot water?

For a while, maybe. The City of Abilene says a rotten-egg smell is often caused by water sitting in the heater too long, and that flushing the heater gives an immediate but temporary fix. Its longer-term fixes are a smaller heater, using more hot water, or replacing a deteriorated dip tube, the cold-water inlet tube. If the smell comes right back after a flush, give us a call.

How long does flushing a water heater take?

The flush itself is quick. The waiting is the long part. A. O. Smith says to turn the heater off a few hours before you drain it, and Energy Trust of Oregon suggests letting it cool overnight so you aren't draining scalding water. Start in the morning, finish after lunch, and have hot water again by supper.