Within a hot water system, there is a perfect place for bacteria to breed under certain conditions. It’s important for your system to maintain high temperatures due to that bacteria growth, or else there are problems that aren’t good for you or your family. Waters that are hot enough will kill any deadly bacteria and leave you safe, but they must be hot enough.
Temperatures above 55C are usually best for your water heater, though those temperatures are extremely hot and come with a risk of scalding if you are not careful. Care must be taken, but water cannot go below this temperature without the risk of breeding deadly bacteria that can make you extremely sick. A lot of hot water systems do not have temperature gauges to tell you what temperature the water is. With newer systems, there are regulators between water and bacteria that can have difficulties reaching an equilibrium. Water temperatures are often lower than the recommended temperature to kill most harmful bacteria in newer systems, so be advised.
If you are concerned, contact your local hot water system technician to check out your system and ensure that the water is being heated properly. Most systems are not at risk and generally do their jobs well.
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