@lindenflower To be sure mycobacteria is killed requires 10 minutes of boiling water. No need to pre-boil to sterilize the water. In fact, I find it safer for the pieces to be heated gradually rather than being plunged into boiling water. I place the equipment in room temperature distilled water in a sauce pan and bring it to a boil (takes 12 minutes on low on my stove), then set the kitchen timer and boil gently for 10 minutes. When the timer rings, I turn the burner off and let the water cool slightly, then use tongs to lift the parts onto a dry paper towel. If you get them out soon enough,the hot water evaporates quickly.

I use a round silicon hot pad in the bottom of the pot to keep the pieces from contacting the hot metal, though it hasn't been an issue in my thick old pans.