I faced this same fear. The guy at Ace tried to convince me to go with a compression union but I fear with the heat and all I would develop leaks I was not aware of. Then I remembered that the husband of one of my wife's friends is a plumber. So, he is invited over for a Super Bowl party with the requirement that he bring over his torch and solder. I'll just do a pressure test on it after to make sure it is sealed up.