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I am installing a 5 zone system with the radiant plumbing located on 2nd floor. All zones are on the first floor in slabs. The average high point of the system is approximately 16' above the tubing. As a retired civil engineer remembering my hydraulic courses technically speaking the water in the tubes will have 0 feet head. Of course add-in pipe friction losses and a few more feet of head should be all the pump would have to overcome to move the water. What's the opinion on moving the water...push or pull? In other words should I put the pumps on the return side for suction feed or on the supply side "pushing" the water through the tubes or no difference at all?