Stainless steel manifolds for use in under floor heating systems. These consist of two manifold bars, one for the flow and one for the return, complete with ball valves and drain/filling valves. On the flow bar each port has a flow indicator, with isolator including an easy-to-read gauge glass. Each port on the return bar is equipped with an integral control valve and protection cap which allows the user to adjust the volume of water, or can be removed to accept a thermoelectric type head. Full version with valves and flow meters.