Mike, we are nearly neighbors as we live near Magnolia. A small world. A question for you on our 2019 Phaeton 40IH. The Aqua Hot manual is so vague on its' operation and functions, but I have read where the engine should be automatically heating the hot water as you travel down the road. Do I need to turn on the engine heat button for this to occur or is there something else I need to do in order to get hot water while traveling?