I try to stay out of these but am equally tired of hearing about Staybrite #8. Solder can marginally outperform braze in burst or tensile testing, but that is not relevant to the criticality of HVAC applications. Solder is simply not very good at handling thermal shock, cyclic fatigue, or vibration. Brazed joints are more than capable of handling any of your pressure needs - with a huge safety factor - as well as all of the dynamic loads of a live system. Codes require brazing because it will outlast the system...and every manufacturer of equipment and piping recommends brazing for HVAC applications. The only people recommending Staybrite #8 are the ones selling it.