You need to be really careful turning up your heater unless you’ve got safety mechanisms on every faucet. Even just 140F will scald a stupid kid/adult/worker in seconds. Many people get disfigured and sued every year over this. 125-130F is about as high as you should go unless you have protection everywhere.
The mixing valve mixs in cold water to the hot water coming out to bring the temp down to where you choose. 140 water never leaves the valve, which is mounted on the exit from the hot water heater. The design is super simple, so failure is very unlikely. But it is designed to fail to full cold.
You need to be really careful turning up your heater unless you’ve got safety mechanisms on every faucet. Even just 140F will scald a stupid kid/adult/worker in seconds. Many people get disfigured and sued every year over this. 125-130F is about as high as you should go unless you have protection everywhere.
The mixing valve mixs in cold water to the hot water coming out to bring the temp down to where you choose. 140 water never leaves the valve, which is mounted on the exit from the hot water heater. The design is super simple, so failure is very unlikely. But it is designed to fail to full cold.
I have never heard of a whole home mixing valve. That sounds like it would be a pretty complicated retrofit.
Ah but the super hot water heaters are also the bomb!