Psi rating for radient floor heat panel test???

67Dart273 said
You don't need to Rob, you can SEE it with soap

I would up the test pressure if you cannot get any soap

HOW ABOUT THE CIRCULATING PUMP shaft seal? Some of those are a mechanical seal. If you are unaware, that is more akin to piston rings, they may not use neoprene seals. I'm not a "boiler man." They may need water present to seal / lubricate

It may also be possible you have a defective bladder tank. I'd pull it and plug it off if any doubt. Look for anything else in that vein........AKA something that is not a connection. AND THAT includes valve shafts!!!!

Here's the other thing....anything above ground, "you can fix." If you get it down to close to "tight", I'd just fill it and run it and go from there. Leaks will become evident. Also "I guess" you are using glycol in the system, AKA antifreeze?

Correct on the glycol mixture. Those are interesting points. I too wondered if it's a ball valve leaking, which is fairly irrelevant once mounted, but a bad bladder in the tank, or a pump shaft may also be the culprit.

Soapy water has stopped revealing any leaks, but to Robs @RustyRatRod point, I could turn it upside down and fill it with soapy water, and add some pressure. That may help reveal something.

Thanks!