Cold water boiled in approximately 3 minutes. Very pleased with purchase. Had difficulty separating the infuser from the lid. Instructions on how to do it would have made it easier.
I love it. But I was alarmed when the shut off function suddenly stopped working(after about 3months) so the unit stayed on/blue and the water just continued to boil and boil. After unplugging, then plugging back in it is working fine now. But will need to keep a close eye on it now.