How to Set Water Heater Temperature

Setting your water heater to the right temperature affects your safety, energy bills, and hot water quality. Too low and bacteria can grow. Too high and you risk scalding and wasted energy.

What Temperature Should a Water Heater Be Set To?

The U.S. Department of Energy recommends 120 degrees F (49 degrees C) for most households. This kills bacteria, reduces scalding risk, and saves 6-10% on energy compared to 140 degrees F.

How to Set Temperature on an Electric Water Heater

1. Turn off the circuit breaker
2. Remove the access panel and pull back the insulation
3. Use a flathead screwdriver to turn the thermostat dial to 120 degrees F
4. Replace insulation and panel
5. Repeat for the second thermostat if present
6. Turn breaker back on and wait 1-2 hours
7. Test temperature at the nearest faucet

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How to Set Temperature on a Gas Water Heater

1. Locate the gas control valve at the front bottom of the heater
2. Turn the temperature dial to your desired setting - HOT or B setting is approximately 120 degrees F
3. No tools needed - dial turns by hand
4. Wait 1-2 hours and test at a faucet

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How to Set Temperature on a Tankless Water Heater

Use the digital control panel on the front of the unit. Press up or down to set to 120 degrees F directly. Check your manual if the unit won't activate at low flow rates.

How to Verify the Actual Temperature

Run hot water for 2-3 minutes at the nearest faucet, fill a glass, and measure immediately with a thermometer. Adjust and recheck after 1-2 hours if needed.

When to Use 140 Degrees F

Use 140 degrees F if someone in your home has a suppressed immune system, or if your dishwasher has no internal heater. At this temperature, scalding can occur in 5 seconds - install anti-scald valves if children are present.

Temperature Quick Reference

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