These are the ‘brains' of the Nu-Heat system. Generally a pair of manifolds is provided for each floor to control the flow and temperature of warm water into the Fastflo® tubing. A Grundfos pump and adjustable temperature control blending valve provide the motive force. Each pair of ports on the manifold serves a heating zone and has an electrical 2-wire actuator, a flow meter and a regulator. Flow and return temperature gauges, a pressure gauge and filling and drain point assist simple set up of all the zones from a central point during system commissioning.