Abstract: A thermal distributing unit for thermal working fluid, primarily for heating and/or air conditioning purposes, comprises a first or thermal supply stand having a main supply connection and a main return connection for the or each thermal working fluid, a second or electricity supply stand equipped with an electrical connection for receiving an electric power supply from an outside source, and an intermediate structure interconnecting the said first and second stands which structure carries rows of paired subsidiary supply and return connections for the thermal working fluid or fluids. The subsidiary supply and return connections communicate with the main supply and return connections through manifolds on the intermediate structure. The said structure may also carry, for the working fluid or fluids motor-driven circulating pumps and control valves associated with the pairs of subsidiary connections.