I currently have radiant heating under my basement concrete. The hot water goes directly from my oversized water tank through my system and back to the tank. One pump does it all. Would I be better off to add a second pump and a heat exchanger? Is there much benefit or is it an extra cost that I might not benefit from for a while? Any advise would be appreciated. By the way, I reside in northern Alberta, Canada, so cool weather can be a factor.