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Bell & Gossett Series PL pumps – A wonderful alternative to wet rotor small circulator pumps Circulator pumps are used for circulating a liquid or gas in a closed circuit and thus are very useful in hydronic heating and cooling systems. The circulators that are used for a single house or for a small scale industry are smaller in structure and rated at a fraction of a horse power. These pumps are called the small circulator pumps and are not only useful for home heating, but are …