Steps to size the Circulator Pump

Every Circulator Pump has various significant features which have to be taken in consideration to prior and making the purchase. The features consists the construction material such as bronze, iron and stainless steel. Many common kind of the circulator pumps which are used for the closed loop radiant and the hydronic application for heating are the cast iron with flanged circulators.

Taco Priority Zoning Circulator

The bronze circulators and the Stainless Steel circulators are specific for the open loop hydronic and the radiant heating as well as domestic hot water application for recirculation. Threaded along with the sweat connection kinds are specifically common for later type of application which makes it simple and easy to connect with the circulator in the line with the offered water line.

Various pumps and circulator are classically sized depending on the load of heat and the head loss which is even known as pressure drop for the provided zone. Follow the below mentioned steps to know how to size circulato pump?

First thing is to identify heat load available in BTU for the specific zone, which even permit to calculate the necessary circulator flow rate of pump in the GPM or gallons every minute. The next and second step is of calculating the head loss and the drop of pressure in system. The Head loss is usually associated with the friction of water against internal surface of pipes and tubing in hydronic or the radiant system of heating and it even restrict the flow rate which can be produced by circulator.


With the use of Pressre Drop Table and the Pressure Drop Chart, which is supplied by manufacturer of PEX tubing, the pressure drop for every ft of tubing will be calculated and will be identified at the provided flow rate of GPM. Third or the final steps, is about matching the procured data with the correct pump. With these steps you can size the Circulator Pump.

pinit fg en rect red 28 - Steps to size the Circulator Pump

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