How Hot To Set The Hot Water Heater Temperature Setting

30 / 03 / 2021

Did you know that you can save money on your electricity bills by adjusting the hot water heater temperature to match the appliances that are using the hot water? This is because your hot water heater makes up approximately 18% of your electricity bill. Essentially, if your hot water heater temperature setting is too high then you will pay the price when your utility bill arrives. Conversely, if the water temperature is set too low then your water may not get hot enough (forcing short showers upon you). Similarly, if the water temperature is set too low then bacteria might start to form in the tank.

You can find the temperature of your water supply by reading the metre on the side of the tank. Alternatively, you can take a temperature reading from the faucet.

Most experts will recommend your hot water temperature be set at 120◦C. This is because it is hot enough to kill most bacteria, but not hot enough to cause scalding if bare skin is exposed to the hot water. 120◦C water will supply enough hot water for most small families and is relatively energy-efficient. However, the best setting for your hot water temperature will depend on a few factors.

Factors That Affect Hot Water Temperature Setting

  • Homeowners with a dishwasher that does not pre-heat their water should set their hot water heater temperature to 140◦
  • The elderly or parents with small children will want to keep the temperature at 120◦ The default setting for hot water heaters is 140◦C or 150◦C. This will scald the skin of baby in under two seconds at the former setting and in under five seconds at the latter setting, so it is worth turning down if you are in either of these two groups.
  • If someone in your household suffers from an autoimmune disease or respiratory disease should keep the water set at 140◦

At the end of the day, the general rule is that for every ten degrees Celsius you lower your hot water heater temperature by, you will save 3-5% on your energy bill. If you live alone you can probably afford to leave the temperature at 120◦C because you won’t need as much hot water. Similarly, if you live in a large household you will want to keep the temperature higher to cater to your family members.

Hot Water Repairs

If you want to adjust the temperature of your hot water heater, just contact NSW Hot Water and ask for an inspection. We will rapidly call out to your property and perform an inspection before adjusting the temperature for you. We are available 24/7 for all emergency repairs, simply call (02) 9722 4500 any time, day or night.