Thanks for your input "j", If I sell the home, I will bring all items up to code...including the plumbing.
It would be highly unlikely that any 1 pex or poly line in my home (except for the 3/4" trunk line) would have any more than 6gpm (most likely 3.5gpm) since both hot and cold were on during the test that resulted in 7gpm. I could test the hot and cold lines separately, but as I mentioned, both are equal in flow rate. And I assume (there I go again) that even HUD code requires the heater tank have a direct feed from the main trunk.
FYI, it takes 15-18 minutes to fill my new tub to my liking (water amount and temp considered) ....that's just plain toooooo long
WOW, 12gpm would be nice!!!! fill it in 5 min!
Im just gonna get out the drill....and I will keep an eye out for the anti-scald police