You can lower the heat on a hot water tank by adjusting the thermostat on the unit. This typically involves locating the thermostat dial or digital display, often behind an access panel, and turning it down to a cooler setting. Always remember to turn off the power to the water heater before accessing internal components.
Why You Might Need to Lower Your Hot Water Tank’s Temperature
Several reasons might prompt you to reduce the heat output of your hot water tank. The most common is to prevent scalding, especially in households with children or elderly individuals. High temperatures can cause severe burns very quickly.
Another significant reason is energy conservation. Heating water accounts for a substantial portion of a household’s energy bill. Lowering the temperature even slightly can lead to noticeable savings.
Finally, reducing mineral buildup and extending the life of your tank can be achieved by keeping the water temperature lower. Extremely hot water can accelerate corrosion and the formation of limescale.
Common Causes for High Water Heater Temperature
- Factory Settings: Many water heaters are set to a default temperature of 140°F (60°C) to kill bacteria. This is often higher than necessary for most homes.
- Thermostat Malfunction: In rare cases, a faulty thermostat can cause the water heater to overheat.
- Recent Adjustments: Someone may have previously turned up the thermostat for a specific reason and forgotten to reset it.
How to Safely Adjust Your Hot Water Heater Thermostat
Adjusting your hot water tank’s thermostat is a straightforward process, but safety is paramount. Always ensure the power is disconnected before you begin. This means flipping the circuit breaker for electric water heaters or turning off the gas supply valve for gas models.
For Electric Water Heaters
Electric water heaters typically have two thermostats, one for the upper heating element and one for the lower. These are usually located behind access panels on the side of the tank.
- Turn off power: Locate the circuit breaker for your water heater in your home’s electrical panel and switch it off.
- Remove access panel: Unscrew or unclip the access panel(s). You may need a screwdriver.
- Locate thermostat: Identify the thermostat dial, often a small knob or a screw with temperature markings.
- Adjust temperature: Use a screwdriver or the knob to turn the thermostat down. A common recommended setting is 120°F (49°C).
- Replace panel and restore power: Securely reattach the access panel. Then, turn the circuit breaker back on.
- Test: Run hot water at a faucet to check the temperature after a few hours.
For Gas Water Heaters
Gas water heaters have a control valve near the bottom of the tank, often with a dial that includes temperature settings or a "hot," "warm," and "vacation" setting.
- Turn off pilot light (if applicable): Some older models may require you to turn off the pilot light. Consult your manual.
- Locate control valve: Find the gas control valve assembly. It usually has a temperature dial.
- Adjust temperature: Turn the dial to a lower setting. Many dials have markings like "Low," "Normal," and "High," or specific temperature ranges.
- Wait and test: Allow some time for the water to cool. Then, test the hot water temperature at a faucet.
Important Note: If you are uncomfortable with any part of this process, it is always best to call a qualified plumber or technician. They have the expertise to make adjustments safely and efficiently.
Recommended Hot Water Tank Temperatures and Safety
The U.S. Department of Energy recommends setting your water heater thermostat to 120°F (49°C). This temperature is hot enough for most household needs while significantly reducing the risk of scalding.
Scalding Risks at Different Temperatures
| Temperature (°F) | Time to Cause Severe Burn |
|---|---|
| 120 | 5 minutes |
| 130 | 30 seconds |
| 140 | 5 seconds |
| 150 | 1-2 seconds |
Source: U.S. Consumer Product Safety Commission
Setting your water heater to 120°F provides a crucial safety buffer, especially for vulnerable individuals. For households with infants, young children, or older adults, this lower temperature is highly advisable.
Energy Savings from Lowering Temperature
Reducing your water heater’s temperature can lead to significant energy savings. For every 10°F reduction in temperature, you can save between 3% and 5% on your water heating costs. Over a year, this can add up to a substantial amount on your utility bills.
When to Consider Professional Help
While adjusting the thermostat is generally a DIY task, there are situations where you should seek professional assistance. If you are unsure about your water heater’s model or the adjustment process, a plumber can help.
Signs You Need a Professional
- Persistent Overheating: If the water remains too hot even after adjusting the thermostat, there might be a deeper issue.
- Leaking Tank: Any sign of a leak requires immediate attention from a professional.
- Strange Noises: Unusual sounds from the tank can indicate sediment buildup or other problems.
- Lack of Hot Water: If lowering the temperature doesn’t resolve an issue, or if you have no hot water, a professional can diagnose the problem.
People Also Ask
How often should I check my hot water tank temperature?
It’s a good practice to check your hot water tank temperature at least once a year, or whenever you notice the water is too hot or too cold. This ensures optimal performance and safety.
Can I lower the temperature on a tankless water heater?
Yes, tankless water heaters also have adjustable temperature settings, usually accessible via a control panel or remote. The process is similar to adjusting a thermostat.
What is the safest temperature for a hot water tank?
The safest recommended temperature for most households is 120°F (49°C). This setting balances the need for hot water with the critical need to prevent scalding injuries.
Will lowering the temperature affect my dishwasher or washing machine?
Most modern dishwashers and washing machines have their own internal heating elements to reach the required temperatures for optimal cleaning. Therefore, lowering your water heater’s temperature usually does not impact their performance.
How do I know if my water heater is set too high?
You can tell if your water heater is set too high if the hot water feels excessively hot at the tap, if you notice steam coming from faucets, or if there’s a risk of scalding when using hot water. You can also use a thermometer to test the water temperature directly.