Psi rating for radient floor heat panel test???

Steve welder said
I know this may sound like a stupid question but did you solder any pipe to sweat adapters while they were made up?
If so thats your problem.

Hercules makes some good pipe sealants, you should check that out
Any threaded fitting that you see leaking bubbles when you apply soapy water or leak detector at 30 psi is a "leak" No way should you see anything leaking (bubbles) at those joints.

I at least have the soapy bubble leaks fixed.

What do you mean solder while the adapters were made up? Like if I had a doped up npt connection together, then got it hot by soldering next to it? No, all soldering was done before any NPT.