Should I Turn Off My Water Heater When I Go on Vacation?

Summer travel season is here, and if you’re loading up the car for a lake trip or flying out of Will Rogers for a week, you’ve probably wondered whether leaving your water heater running the whole time is just burning money. It’s a fair question. Your water heater quietly reheats a full tank around the clock even when nobody’s home to use a drop of it. Here’s how to think about it for both tank and tankless systems, and why the water heater isn’t actually the most important thing to shut off before you leave.

Vacation Mode vs. Fully Off: What’s the Difference

Most modern tank water heaters have a “Vacation” or “VAC” setting on the thermostat dial or digital control. This is almost always the smarter choice over shutting the unit down completely.

• Vacation mode keeps the burner or heating elements on standby, holding the water at a low temperature (roughly 50 to 60 degrees). It prevents the tank from going stone cold, avoids stagnation problems, and on a gas unit it keeps the pilot lit so you’re not fumbling with a relight when you get home.
• Fully off means no heating at all. You’ll save a little more energy, but you trade away convenience and, on gas models, you’ll have to relight the pilot on your return.

For a trip of a few days up to a couple of weeks, vacation mode hits the sweet spot: meaningful energy savings without the hassle. The reheat when you get back is quick because the water never dropped to ground temperature.

When Fully Off Actually Makes Sense

There are a few situations where cutting the water heater off entirely is worth it:

• Long absences. If you’re a snowbird or gone for a month or more, the extra savings from a fully cold tank start to add up.
• An aging or leaking unit. If your heater is near the end of its life, powering it down while you’re away reduces the chance of a failure happening with nobody home to notice.
• You’re also shutting off the water (more on that below). If the supply is off, there’s less reason to keep heating a tank you won’t refill.

If you do go fully off on an electric unit, just flip the dedicated breaker. On a gas unit, turn the gas control valve to “Off” rather than just “Pilot,” and know you’ll need to relight per the instructions printed on the tank when you’re back.

Tankless Water Heaters Are a Different Story

Tankless units only fire up when you actually open a hot tap, so they use almost nothing when the house sits empty. There’s no big tank of water being reheated all day, which means the savings from shutting one down for a week are small.

Many tankless models have a vacation setting too, but for a typical summer trip it’s usually fine to just leave it be. The one thing worth doing: if your tankless heater is in a garage or an unconditioned space, don’t cut its power, because most units run a built-in freeze-protection cycle that needs electricity. That matters more in winter than in a July heat wave, but it’s a good habit either way.

Don’t Forget the Gas Pilot

If you have an older gas tank heater and decide to go fully off, remember the sequence. Turning the control to “Pilot” keeps the small standing flame lit while stopping the main burner. Turning it to “Off” kills the pilot entirely. Only choose “Off” if you’re comfortable relighting it, and never try to relight if you smell gas near the unit. If that ever happens, leave and call your gas utility from outside.

The Step That Matters More: Shut Off the Main Water Supply

Here’s the part homeowners overlook. Whether or not you touch the water heater, the smartest thing you can do before a trip is shut off the main water supply to the house. A water heater on vacation mode saves you a few dollars. A supply line, washing machine hose, or ice maker connection that lets go while you’re gone can flood your home for days before anyone notices.

Central Oklahoma summers pile on the risk: afternoon thunderstorms, hail, and power surges roll through Edmond, Norman, Moore, and the OKC metro regularly this time of year. A surge can knock out a sump pump or trip a heater’s controls, and a supply-side leak keeps running no matter what.

Before you head out:

• Locate and close your main shutoff valve (usually where the water line enters the house, or at the meter).
• After closing it, open a couple of faucets to relieve pressure, then shut them.
• If you’d rather leave water on for a lawn sprinkler or someone house-sitting, at least close the individual valves to the washing machine, dishwasher, and ice maker.

With the main off, a fully cold water heater is fine and the leak risk drops dramatically.

What About Freeze Risk?

In July, freezing isn’t your concern. But the same shut-off-and-drain habits that protect against summer leaks are exactly what protect against burst pipes in an Oklahoma cold snap, so it’s a routine worth building now. For a broader checklist on protecting your home while you travel, the U.S. Department of Energy has solid, no-nonsense guidance on water heating at energy.gov.

If you’d like a plumber to check your heater, main shutoff, and supply lines before your next trip, Triple Play Home Services offers free estimates with flat-rate pricing and answers the phone 24/7. As a veteran-owned company serving the metro since 2009, we’re glad to walk you through it at (405) 500-5333.

A quick recap: for most summer trips, put a tank heater in vacation mode, leave a tankless alone, and above all, shut off the main water supply. That combination saves energy, avoids relight headaches, and protects your home from the one thing a running water heater can’t help you with.