Caleffi 278HE Series circulation group 3/4" F connections return connection with UPM3 pump - 1-13 l/min.Caleffi 278HE Series circulation group 3 4" F connections return connection with UPM3 pump 1 13 l min. The Caleffi 278HE Series circulation group has the function of regulating the temperature inside the boiler and is used on the primary circuit of solar systems . Safety devices are inserted in the group in order to guarantee regular monitoring of the circuit. This version has a return connection and is equipped with a Grundfos UPM3 Solar 15 75 high
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Caleffi 278HE Series circulation group 3/4" F connections return connection with UPM3 pump - 1-13 l/min.