I don't use a Pari, but I do boil my nebulizers - just a cheapo reusable from the medical supply. After 8-10 sessions boiling, I usually toss. Or I will take the old ones (boiled) along on a trip, use and wash each for a couple days, then toss. It is easier than trying to disinfect along the way unless we are in our camper, where I am set up to do it easily.
I know the vortex tube can be boiled, but I have had bad luck with the internal silicone flap thingie closing right after doing it.