I am always looking for efficient ways to shorten my all-grain, +10 gallon batch brewday. Therefore I've been adding my IC with 20 minutes left in the boil, without any water in it - just connected hoses. My thought is, this way, it takes less time for the wort to get back to a boil after immersing it in the kettle to sanitize it, and I can complete my boil more quickly. Is there any danger of bursting the coil by doing this, rather than running water through the connected hoses and IC before immersing it?
As regards a different lesson learned, I found that tipping it upside down to drain it after the boil is done and hoses are disconnected, it doesn't always drain well, and if left outside in the unheated garage it can freeze and burst the coil. So now I keep it stored in my heated basement.