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Possible to damage plastic threads on indirect water heater?
I am installing a SuperStore Contender SSC-50 indirect water heater and one of the things I noticed is that threading for boiler feed and return connectors are plastic. I am sweating a pipe on an elbow right out of the feed connector and I am concerned with a possibility to melt/damage the thread. At the same time if I don't heat the joint properly I can not do a good sweating job. Does anybody know what kind of plastic is there and how resistant it is to this sort if thermal damage. Thank you.