Can someone help with this? It's a new-to-us house. Water in kitchen (in next room) is fine. Water in shower is tepid at best. Friends suggested it might be the anti-scald device; guy at hardware store told me I was probably on the right track but couldn't offer any more advice. Back side of shower is exposed in outer wall (we need to cover it with sheetrock) but I see nothing there...I've done a little ****** research. Seems like I need to remove plate over shower control handle from the shower stall side (just a one-piece handle) but I'm a little nervous I'll end up with no shower!