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8200 N. Austin Ave
 Morton Grove
IL 60053
USA
 Tel 847 966-3700
Fax 847 965-8379
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 Dictionary of Terms
Primary-secondary Pumping
Most of the applications for this pumping technique, pioneered by Bell & Gossett,
have been in large commercial systems such as chilled water campus systems, dual temperature change-over systems,
and freeze protection for make-up air systems. In recent years though, there has been renewed interest in this
technique for smaller, light commercial - and even residential - applications. In fact, multiple hot water boiler
applications, when installed correctly, must use primary-secondary pumping.
Radiant in-floor heating has become
very popular too. To meet the design water temperatures of radiant systems, the mixing of some cooler return
water with some hot water from a cast iron boiler must take place, and the most effective method for
accomplishing this is through primary-secondary pumping. Most residential cast iron boiler manufacturers
have limitations on the water temperature maintained in their boiler, but, when using these boilers with
radiant heating systems, primary-secondary pumping is an effective way to raise the return water's temperature.
Read more in the article "Primary-Secondary Pumping Rules of Thumb".
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