Pump and control unit for a solar heating installation for a water tank, and particularly for a swimming pool

A pump and control unit for a solar heating installation for a water tank, such as for a swimming pool, said installation having at least one solar collector for converting the energy from solar radiation into heat, a hydraulic circuit containing an outward-flow pipe connecting the tank to the inlet of the collector and a return-flow pipe connecting the outlet of the collector to the tank, a pump which circulates the water from the tank through said hydraulic circuit, and a derivative-action control unit which is electrically connected to the pump and to two sensors mounted on the outward-flow pipe and on the return-flow pipe, respectively;

• said unit comprising said pump, derivative-action control unit and two sensors all contained in a single opaque case which is traversed by a section of said outward-flow pipe and a section of said return-flow pipe and which is provided in its top wall with a transparent opening through which said sensor on the section of return-flow pipe can be insolated, said section of return-flow pipe which carries the return-flow sensor being in the form of an arch or of an inverted U, the sensor being mounted on the central portion of said arch and extending just below said opening.