Have you ever turned on a faucet only to get burnt by the hot water? Maybe the water got hot quicker than you expected, or it just go so overwhelmingly hot when you expected it to be a moderate temperature. Both of these issues can be solved by an anti-scald valve. It is an integral part of your plumbing system that can save you from being burnt by your water. Your water heater can put out water that is 160 degrees, and if skin is exposed to that for a few seconds, you will be scalded. If you have young children or elderly ones at home, they could easily be hurt.
Anti-scald valves mix the water in your pipes, leaving the water a more comfortable temperature. It also takes away the risk of sudden temperature changes when water starts running out another faucet or someone flushes a toilet. Installation is not very complicated and can be done without major disruptions to your daily life.