In my Master Bath Remodel, the Water Heater is about 7' from the corner of the room. It has a 1/2" Pex Line coming to the bathroom. Lots of people have said that this feeder line should have been 3/4" but I would have to rip out some walls to make that happen. Since all of the downstream lines are 1/2", I don't see flow as being an issue unless all lines(bath, shower and vanity) are turned on at the same time. Do you think I need to change this feeder line?