When you said that "half the joints leaked", what are you referring to? Your heater only has two, IN an OUT, right?
Are they leaking?
Are half of all the joints you put together leaking?
This is very strange.
It sounds like you have been invaded by a different Physics that doesn't apply in the rest of the universe..
Maybe you should go copper at the heater, and switch to PEX ASAP.
-AC
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I'm not an HVAC technician. In fact, I'm barely even a hacker...
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