I'm currently putting together a new boil kettle, and am planning to use 1/2" NPT threaded fittings attached to a welded coupler. I've seen a lot of designs which have exposed threads and teflon tape inside the kettle, which sounds unsanitary to me.
Are exposed threads an issue? And if so, what can be done about them? Soldering? Or, is it possible to get parts that will make a seal with a coupler without exposing threads?