Quote:
Originally Posted by Bob Denman
Do you happen to know why the pressure seems to be so critical?
I changed to a higher pressure regulator; but I'm not sure why!
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As it was explained to me...it takes a certain amount of water pressure going through a valve in the tankless water heater for it to heat. If the pressure is not high enough, or fluctuates, the water will not stay hot. That's why, when someone turns the water off while lathering, they get that shot of cold water.