Pair of 1” polymer manifolds in bars, with 3/4” x 18 Eurocone outlets, consisting of a supply manifold complete with flow meters for balancing supply circuits, a return manifold complete with manual shut-off valves, thermostatic-ready for adjustment with electrothermal actuators and protective knobs, ball valves with thermometers, automatic air vent valves, fill/drain taps, and mounting brackets.