Water Heater

How to Adjust the Temperature on Water Heater

How to Adjust the Temperature on Water Heater

Your water heaters provide you with hot water for cleaning, cooking, bathing, and other daily activities. But hot water above a certain temperature can also burn your skin. Your hot water heater must produce water at the proper temperature.

So, how do you adjust the temperature of the water heater? You can set a water heater’s temperature using the thermostat or a temperature knob. Expert says your normal water temperature must be between 120-140 degrees Fahrenheit to avoid burns.

A water heater’s temperature can be adjusted based on the requirement. Read on to safely adjust the temperature on the gas water heater.

Ideal Temperature For a Water Heater:

Water heaters should be set to a specific temperature range for several reasons. Low temperatures can promote bacterial growth, leading to Legionnaires’ disease and making hot water lukewarm. To avoid this, set the water heater to a Legionella-resistant temperature. OSHA recommends setting water heaters to 120-140 degrees Fahrenheit to reduce Legionella and other microorganisms.SS

Even if you are tempted to heat it up, hot water is hazardous, especially to children. At 150 degrees Fahrenheit, two seconds can cause third-degree burns (66 degrees Celsius). The optimal setting of the water heater is 120 degrees Fahrenheit, and it is best to avoid scalding (49 degrees Celsius). Overheating your water heater can also increase your energy bill.

Each house is unique. Water from a faucet further away from the water heater loses more heat if the pipes are not insulated. You may need to raise the temperature above 120 degrees Fahrenheit (49 degrees Celsius) to compensate.

Set the temperature for your family and home using your best judgment. Temperatures higher than 120-140 degrees Fahrenheit should be avoided (49 to 60 degrees Celsius). Adjust, test, and repeat until you find the ideal home and water heater temperature.

Also, Read: How To Turn On An Electric Water Heater?

How To Adjust The Temperature On A Gas Water Heater?

The majority of manufacturers advise using 120 °F (49 °C) water during your home stay for your safety. This temperature is preset when the majority of water heaters are installed. Just leave it alone to prevent injury. Your water may be too cold due to Inadequate Insulation or a malfunctioning heating element. A competent plumber can identify and fix a water heater and can replace the insulation if needed.

Dial Twiddling:

Dial gas water heaters are easy to use because only one knob controls the temperature. This knob can be turned left or counterclockwise to heat the water. Turn right clockwise to cool.

The lower temperature range of most gas water heaters is 90 to 110 °F (32 to 43 °C), and the upper temperature range is 140 to 150 °F (60 to 66 °C). It can be difficult to find the correct temperature if your dial is not numbered. After making adjustments, take the water temperature several times and write down or label the precise degree reading on the dial.

Also, Read: How to Test Thermocouple on Water Heater?

How to Adjust Temperature on Electric Water Heater?

An electric water heater with a tank design can be heated similarly to a gas one. In contrast, the temperature control on an electric unit is typically concealed behind an access panel located near the bottom of the machine.

You will probably need to unscrew a few screws to access the panel. Typically, insulation must be removed in order to have access to the temperature control. The control knob must only be turned up or down to the proper temperature or corresponding symbol. Reinstall the insulation after you’re done to stop heat loss and energy waste.

How To Adjust Temperature On Tankless Water Heater?

A tankless water heater’s temperature change is much easier than other machines. This is so that you can see the exact temperature set. The majority of tankless systems have a digital display. Press the up or down arrows until the desired temperature is displayed to adjust the water’s temperature.

What Are The Advantages Of Water Heater Temperature Adjustment?

There are numerous benefits to optimizing the water heater’s temperature. Among them are:

Individual Comfort:

By manipulating the temperature, one can extend the luxurious experience of a soak in the tub or shower by guaranteeing an uninterrupted supply of hot water. Furthermore, it aids in the maintenance of cold-bought appliances (such as dishwashers and washing machines).

Ensure that the water temperature in your water heater does not exceed 120 degrees Fahrenheit (49 degrees Celsius). Burns are more likely to occur at elevations over this threshold, particularly among young children and the elderly.

Energy Saving:

Heating large quantities of water is expensive. A water heater set at 38–43 °C (100–110 °F) could perhaps reduce the cost of your upcoming heating bill. Little modifications may accumulate to substantial savings over time.

How Can The Temperature Of Water Be Determinate?

A water heater may overheat or over-cool due to a multitude of factors. Verify whether the water heater is operating at a higher or lower temperature than usual.

To determine the temperature of the water in the sink, operate the hot water faucet to its maximum setting. By stirring for thirty seconds, the water is brought to a boil. Following this, the temperature is determined by using a kitchen thermometer. Assure that your water heater is operating at the correct temperature without overheating.


In conclusion, the gas water heater’s temperature can be easily changed to suit individual preferences. The safe and efficient operation of your water heater depends on your continued proficiency in reading the thermostat, your observance of all relevant safety precautions, and the implementation of any necessary adjustments.

Heating and cooling systems can be evaluated for efficiency through preventative upkeep and regular alterations. The servicing instructions for the hot water system will include how to fine-tune the temperature for optimal use.


What temperature should I set the gas water heater to?

Temperatures should be in the 140-120 degree Fahrenheit range. Having children is considerably more dangerous, given that the human body can withstand temperatures of up to 120 degrees Fahrenheit.

Disclosure: We may get commissions for purchases made through links in this post.

About the author

Mobeen Shahid

Mobeen Shahid is a Mechanical Engineer with two years of experience in the HVAC industry. His passion is analyzing HVAC issues, and he works relentlessly to devise customized solutions. He has been in the industry long enough to know the ins and outs and ensures that areas are optimally heated, cooled, and ventilated.