I have a free-standing bath in my bedroom and a separate shower stall in an adjacent room.
When we run hot water in the bath the shower head starts running-- not just a drip... more like moderate rain. This doesn't happen with cold water running in the bath. To be clear, this is not a shower/bath combo with diverter but two different faucets in separate rooms. The plumbing for both rooms was completed at the same time (about 8 years ago).
I'd be grateful for any ideas on what would cause this problem and how it could be fixed.