El Penguini wrote:
I'm the OP.

15 minutes after reading your response, my wife says, "I noticed it is
taking longer to get hot water, I wonder if that is what it does."

Sure enough, set it right and it allows a faster hot water service.

thanks for the input everyone!

Peter

I would be wondering just how goo a plumber that guy is if he couldn't
recognize it instantly.

Harry K