So the shower point of use is about 42 inches from the heater, I know this because the minimum distance is 36″ of copper before you hit pvc/pex piping. The water takes about 6 seconds to get to warm and a couple more to get to hot in the shower. Upstairs in the 1st floor half bath, the hot water took about 9-10 seconds to get warm. Either way, this is going to save me a ton of money this winter when I don’t have to use my furnace to heat my hot water anymore, and that’s the most important and satisfying benefit.