I am about ready to pour a slab for my boss's 4 car garage. He already has radiant heat and I think even though he has little interest that it would be stupid to not heat the slab or at least not have the option to in the future. The closest corner of the garage is about 70 feet from the pair of boilers in the basement. The garage measures roughly 24x60. Any thoughts as to how you would go about it and what I would have to do to the control system?