I have a strange water line arrangement coming into the house and I would like to know what line is for what - I understand that I have cold 3/4 pipe coming in to the house and cold 3/4 pipe going to other parts of the house and the hot water heater. The hot water heater has 3/4 line going to the rest of the house.
Now here is my question where on earth do the 1/2 inch lines go (or where should I expect them to go?)
The Red rectangle in the picture is the concrete floor. The lines are all copper pipe.