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150 Years | Milestone 1953 THE DECISIVE STEP The Wilo-Perfecta was the first glandless heating circulator on the market. The Perfecta initiated the transition from glanded to glandless technology. In 1952 Wilhelm Opländer took over the license for the construction of a glandless circulator, which was first delivered in 1953. The pump was a real innovation: not only did the Wilo-Perfecta convince with its high performance despite its small size, it was also the first maintenance-free heating pump