I am redoing a small bathroom, and I've finished the demolition down to the studs and joists. I'm getting ready to rough in the new supply lines to the toliet and sink, but I have questions about plumbing the shower. The new shower valve I got is pressure-balancing and temperature balancing - it's heat sensitive and the inlets are 1/2" female npt.
Although there's an access panel, I'd rather not use any unions in plumbing this in and sweat as many connections as I can. If I can avoid taking it apart I'd rather, but if it comes to it I guess I would to avoid heat damage.
Can anyone comment on using unions in general? They seem easier for a diy installation - which this is - but they just seem like they're more prone to possible leaks. Right now I'm consigned to measure everything out and dry-fit everything, then sweat joints as far from the valves before either tightening the threaded connections or disassembling valves and sweating those.
Would anyone advice sweating a threaded connection? I would prefer not to because it seems that would make disassembly a real bear, but I'm curious.