For quite a few people, there’s nothing better than a hot shower to start the day. While that may be a great way to wake up and start the day, experts say you can set your water too hot.

Setting your water heater to a temperature that’s too hot can waste power and cost you money. It also can cause a safety challenge for members of your residence. But, if you set your water heater temperature too low, it can permit growth of potentially harmful bacteria and not produce sufficient hot water for your dwelling.

So, what number is the right one for your water heater? In this article, we’ll determine the most efficient temperature to use, when there could be cause to set it a little higher and how hot is too hot for your personal water heater.

What Is the Most Efficient Temperature for a Water Heater?

Although many brands suggest setting the water temperature at 140 degrees, a better temperature for a water heater is 120 degrees Fahrenheit. Specialists say 120 degrees provides the right balance between safety and energy consumption.

The U.S. Department of Energy states that setting a home water heater temperature at 120 degrees could save roughly 22 percent on energy costs. Energy waste is a particular challenge for water heaters because traditional tank models always heat a tank of water in case it is demanded. If you have the water heater temperature set too high, your water heater is consistently heating a tank filled to the brim with very hot water.

So What Temperature Should My Hot Water Be?

More often than not, the suggested efficient temperature of 120 degrees is the right setting for your water heater. At 120 degrees, the water is warm enough to meet the needs of most homes, but not so hot that it could cause burning skin on contact. This makes it a safer option, especially in homes with young children or elderly people. Lower temperatures also cut down on mineral deposits in your water heater, which could cause it to break down or need to be replaced with a new one.

Can I Raise My Water Temperature Higher Than 120 Degrees?

While many energy experts say 120 degrees is the best water heater temperature if you’re looking to save money, is it acceptable to set it higher? Apart from personal preference, there are a couple of different circumstances where it could make sense to set your water temperature a little higher, between 130-140 degrees:

  • Bacteria: Higher water temperatures can be beneficial in eliminating harmful bacteria that can cause or exacerbate certain health conditions. This also may be practical if you know your home has an issue with bacteria, or if any people who live in your home are immunocompromised.
  • High usage: If your home tends to use a significant amount of hot water simultaneously—showering while also running the dishwasher and washing machine, for example—a greater water heater temperature may be necessary to make sure there’s enough hot water for all the household's needs.
  • Old dishwasher: If your dishwasher is getting up there in years and doesn’t heat water on its own, you may need to set your water heater to a higher temperature for it to work properly.

What Temperature Is Too Hot for my Hot Water Heater?

Even though some people like their water quite hot or prefer to blend hot and cold water to achieve their ideal water temperature, there is such a thing as water that is too hot. Experts say any temperature above 140 degrees is too hot for a water heater in a home. At 150 degrees, which is regarded as way too hot, it takes a few seconds for the water to lead to third-degree burns. This is why a water heater temperature of 150 degrees is particularly unsafe in households with children or the elderly.

Call Kohles & Bach Heating & Cooling for Your Water Heater Service Needs in Des Moines

Water heaters can sometimes feel a little mysterious, but the knowledgeable pros at Kohles & Bach Heating & Cooling know these appliances extremely well. They’ve serviced many brands and types of water heaters over the years, so they have the experience to tackle your water heater repair in Des Moines.

We also are skilled in water heater replacement, so give us a call at 515-278-2900 if you suspect you need water heater installation in Des Moines. We are happy to take a look at your system and give a complimentary estimate!