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Circulator pumps have numerous applications, but are particularly useful in heating/cooling systems and for hot water return. There are two types of circulating systems - open and closed. Closed systems are typically used for heating/cooling applications, such as underfloor heating or baseboard heating.
It is important to note that excessive air will damage the pump. With this in mind use a dedicated flange to connect to the hot water cylinder. A non stop Essex flange will give the least resistance and is best for 22mm pumps, if you are fitting a 15mm pump a Surrey or a Salamander S-Flange will be sufficient.t is important to note that excessive air will damage the pump. With this in mind use a dedicated flange to connect to the hot water cylinder. A non stop Essex flange will give the least resistance and is best for 22mm pumps, if you are fitting a 15mm pump a Surrey or a Salamander S-Flange will be sufficient.