Water Heater

How To Adjust The Temperature On Gas Water Heater?

How To Adjust The Temperature On Gas Water Heater

Because of their efficiency and low cost, gas water heaters are popular for many houses. Your gas water heater is intended to heat water to the same temperature every time, so you rarely need to alter it. However, there may be occasions when your water is insufficiently hot or far too hot. So, how can you adjust the temperature on a gas water heater? You can use a knob on the heater to adjust the temperature according to your requirement.

Steps to Adjust the Temperature on a Gas Water Heater.

Tank Style Gas Heater.

The temperature knob on a tank-style gas water heater is usually near the bottom. Changing the temperature on this gadget is as easy as turning the knob to the desired setting. The only disadvantage is that most systems only display nominal temperatures rather than the actual temperatures used for the various settings. To avoid mistakenly changing the device to too high or too low, you should become familiar with the temperatures correlating to each setting. The good news is that these symbols are quite constant across various units.

The first setting after “Off” is usually marked by a complete circle or “Low.” It is usually between 90 and 100 degrees. The next highest setting, 120 degrees, is usually represented with the word “Hot” or a triangle. You should now see the three higher settings, A, B, and C, corresponding to 130, 140, and 150 degrees, respectively. “Very Hot” usually refers to a temperature setting of 160 degrees Fahrenheit.

Also, Read: Can I Use Propane On A Natural Gas Water Heater?

Old Heating System

Older water heaters usually have a “Pilot” button that can be used to relight the pilot flame. Most newer devices do not have this option because an electronic igniter is utilized rather than a steady pilot light. Your appliance may have a “Vacation” setting if it has a pilot light. While you are away, the appliance will not function and consume electricity. The pilot light, however, will remain lit since gas will continue to flow to it.

What Temperature The Heater Should Be Set At?

Safe operating temperatures for most water heaters are between 120 and 160 degrees Fahrenheit. Several tank-style systems can set The water temperature as low as 90 or 100 degrees. Though great for cutting costs, this setting should never be left in place if you regularly use hot water.

Tank water should be boiled to at least 120 degrees to prevent the rapid growth of harmful bacteria. The most harmful is the Legionella bacteria, which causes Legionnaire’s illness and thrives in warm water. Reduce this danger by keeping your water heater at a steady 120 degrees, the minimum temperature at which germs can be killed.

Also, Read: Will A Gas Water Heater Work Without Electricity.

Most devices have a temperature setting up to 160 degrees Fahrenheit, but you should never exceed 140 degrees. Keeping your water heater at 120 degrees is recommended by the EPA. This reduces energy loss and protects the device from overheating. To help with cleaning and sanitation, OSHA recommends setting your water heater to at least 140 degrees Fahrenheit.

Temperatures between 120 and 140 degrees Fahrenheit are generally seen as acceptable. However, this is ultimately a matter of taste. The recommended temperature for a water heater in a home with small children is 120 degrees Fahrenheit. If no children are in the house or your children are older, we typically advise increasing the temperature to 130 or 140 degrees.

It’s also a good idea to turn your water heater up to the highest possible level during the winter. Hot water can cool down considerably as it travels from the water heater to the sink or shower in the winter since the water lines are always cooler. Turning up the temperature on your water heater is essential if you want to avoid cold showers this winter.

Tips for Optimizing Gas Water Heater Temperature.

Consider Energy Efficiency.

Lowering the temperature can help you save money on energy. However, do not set it too low because germs can develop in water at lower temperatures.

Avoid Scalding.

Children and the elderly are especially vulnerable to burns if the temperature is too high. Safe and comfortable temperatures are around 120 degrees Fahrenheit (49 degrees Celsius).

Frequently Double-Check.

Monitor the thermostat and make any required adjustments when the seasons or your family’s needs change.

Water Heater Insulation.

By properly insulating your water heater, you can keep the temperature set for longer without making as many adjustments.


Adjusting the setting of your gas water heater correctly is important for safety and efficiency. Ensure everyone’s safety before making any changes, and try to find a balance between satisfying everyone’s need for hot water and encouraging everyone to use less of it. Your gas water heater will function more efficiently and reliably with routine temperature checks and adjustments.


How high of a setting should I use for my gas water heater?

Gas water heaters function most efficiently at temperatures between 115 and 120 degrees Fahrenheit. There are usually settings on a water heater that allow you to adjust the water temperature within. Each of options A, B, and C in the video’s water heater sees an increase of around 10 degrees.

In a gas water heater, what does the ABC temperature setting mean?

For most household needs, that temperature should suffice. Some water heaters contain “A-B-C” letters instead of digits for temperature settings. As a rule of thumb, 120 degrees is A, 130 degrees is B, and 140 degrees is C.

Why isn’t my gas-heated water extremely hot?

The diaphragm in the gas meter, the showerhead, and the lack of hot water pressure are all examples of such issues. Inadequate gas supply to the hot water heater could also be to blame. A gas bottle that is too small can cause this problem. As an alternative to hot water, you may get cold water.

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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.