We recently bought this place and are in the middle of updating the bathroom. Bought all new tub/shower fixtures as well as a valve. Handyman installed and flushed/tested/etc. this new valve, and I’ve since installed the new spout, faucet, shower head. Things work okay, EXCEPT when the tub is on, the shower comes on. Not just a trickle!
I’ve searched and searched to find a similar problem with answers in the forum, and what I’ve found is related to pex vs copper and shower height. Everything was copper before and still is. Also, we didn’t change the shower height. I did purchase a gooseneck shower arm to add a little bit of height/length, but it makes no difference. Not knowing much about water pressure, my gut is telling me it’s something to do with that and the new valve. It’s a pressure balancing valve that cost a good $90 and says it’s 20psi (seems low?). It fits the new faucet specifically. The old valve was a delta, and I don’t know if the previous owner had the same problem. We do live in the foothills and have high water pressure naturally. Also, although we have a VERY large and nearly new water heater, we seem to run out of hot water very quickly in the tub. Related?
I have the drywall behind the fixtures open but don’t know where to go with it as of now. Any ideas?
Thanks for reading.