Arizona homeowners ask this question more often than most, and for good reason. Between extreme summer heat, long vacations, and the hundreds of thousands of snowbirds who live here only part of the year, deciding whether to shut down a water heater is a practical concern.
Whether you should turn off a water heater if the water is off is really a safety concern and about protecting your system. It also depends on how long you expect your home to be vacant or whether an emergency pops up.
What Happens When You Turn Off a Water Heater?
Turning off a water heater stops it from heating water. It won’t drain the tank unless you do it yourself. When properly shut down, modern water heaters can sit idle for weeks or months without issue.
Problems arise when water heaters are left powered or fueled without water flowing through them, or when they are restarted incorrectly. Most water-heater damage tied to shutoffs comes from sequence errors, not from the shutdown itself.
Situations When Turning Off Your Water Heater Makes Sense
So, should you turn off your water heater if the water is off? Here are the most common scenarios.
Vacation and Extended Absences
If your home will be vacant for an extended period, turning off the water supply and shutting down your hot water heater may be a good idea. This prevents leaks and wear and tear on your system. Even when nobody is home, your system will cycle and continue to keep water at the right temp.
When Water Service Is Turned Off
A frequent question homeowners ask during plumbing work or municipal shutoffs is, “Should I turn off water heater if the water is off?” The answer is yes.
Water heaters should never operate without a full tank of water. So, while you may still have hot water flowing in your faucets, as the amount of water in your tank decreases, you can easily burn out heating elements or cause components to overheat.
If water to your home is shut off for any reason, it’s always a good idea to power down your unit until the water’s flowing again.
Emergency Plumbing Situations
Burst pipes, slab leaks, or major plumbing repairs often require shutting off water immediately, and that means turning off your water heater, too. This is especially important in Arizona homes where water heaters may be located in garages or utility closets and leaks can cause significant damage before being noticed.
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When Leaving the Water Heater on Is Usually Fine
If you take short trips and you’re only away for a few days, you typically don’t need to shut down your water heater. While there may be some small energy savings, restarting and reheating water may not save you anything, and put extra stress on your system. Today’s water heaters don’t use a lot of energy when idle, and the warm temps in Arizona minimize standby heat loss.
If your home is occupied year-round and you’re just away occasionally, it’s OK to leave your system running.
How to Turn Off a Water Heater Safely
To turn off your water heater, you should always follow the manufacturer’s instruction to do it safely and ensure a safe restart as well. Here are the typical recommendations.
Electric Water Heaters
Shut off electric water heaters by turning off your circuit breaker. Make sure your power is off before you turn off water to the unit.
Gas Water Heaters
Gas water heaters can be set to “pilot” or fully “off” using the control valve. This stops heating while maintaining safe gas control.
How to Restart Your Water Heater After Shutoff
A safe restart should follow a specific order:
- Restore water supply and open hot water faucets to purge air.
- Confirm the tank is full.
- Restore power or gas supply.
- Make sure water heats to the proper temperature.
Common Mistakes Homeowners Make
Simple mistakes can cause problems, so make sure you avoid:
- Turning off water but leaving power on.
- Restoring heat before refilling the tank.
- Forgetting to relight or properly reset gas controls.
- Assuming short shutoffs require no precautions.
You can always get in touch with the professionals at George Brazil Plumbing & Electrical with your questions or if you want expert help in shutting down or restarting your water heater. George Brazil has been in business for more than 70 years, serving Arizona homeowners with professional, honest, and fast service.
Contact George Brazil for water heater service, repair, or installation.
