Most water heaters are set to 140 degrees Fahrenheit at the factory and allow a temperature up to 160 degrees. Some electric water heaters allow temperatures between 170 and 190 degrees. Despite that, the U.S. Department of Energy (DOE) recommends a maximum setting of 120 degrees. Let’s explore what happens when you set your water heater temperature beyond that recommendation.
Faster Scale Accumulation
Your water supply has calcium and magnesium, which can leave behind deposits. That limescale can build up in your tank over time. Scale makes a water heater less efficient, increases pressure in the tank, and makes the water temperature less consistent. It also promotes rust. Setting your water heater temperature too high means you’ll have to flush the tank and replace the sacrificial anode rod more often.
Bigger Electric or Gas Bill
Water heating accounts for nearly 20% of the average U.S. household’s annual energy consumption. Every degree you set beyond what you actually need can cost you up to 0.5% more. There are other cost considerations as well. As mentioned, scale makes a water heater less efficient and can drive costs up by as much as 15%. The other issue is that a water heater loses energy through its hot water pipe, tank, and (if applicable) exhaust. When the temperature is higher, there’s more energy to lose, and you’ll lose it at a higher rate.
Larger Household Carbon Footprint
A water heater is a significant contributor to a household’s carbon footprint. Often, it’s in second place, behind only the home’s air conditioner in total greenhouse gas emissions. Lowering your water heater temperature as much as possible lowers your household’s environmental impact.
Higher Rate of Part Failure
With proper maintenance, an anode rod can last five years. With a temperature that’s higher than necessary, you may have to replace it every three years or even more frequently. A higher temperature increases the failure rate of other parts, too, including thermostats, heating elements, and thermocouples.
Lower Water Heater Lifespan
Standard tank water heaters can last 15 years or even longer, but that’s unlikely to happen if the temperature is too high. You might only get six to eight years out of your unit, as using more energy accelerates wear and tear on the tank, combustion equipment, and heating elements.
Risk of Scalding
Energy efficiency isn’t the only reason the DOE recommends a maximum of120 degrees; another is scalding. Children can burn themselves at 120 degrees, but it takes about 10 minutes. At 140 degrees, it takes only three seconds.
Do you need help because your water heater temperature is too high? Call our team at Whipple Service Champions in Salt Lake City, UT to schedule water heater service.
