I guess I didn't explain myself the best. We live in the midwest and winters can get brutal, periods of time below zero. My biggest fear, is a component in the current balboa revolution pack failing and not being able to find parts or pay for one part, what a new Spa pack would cost. Also, is it even possible to re plumb in a new spa pack in the dead of winter? If it is, I guess I could make the switch when the current pack fails. If not possible to do in the dead of winter, I imagine changing to a new spa pack with more parts availability would be wise before winter? What's your guys thoughts?