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Posted by HeatPro on June 30, 2006 at 13:55:50:
In Reply to: Help with radiant pump sizing posted by Eichler on June 30, 2006 at 12:01:58:
My seat of the pants guess would be to purchase 1/6 HP, 35 GPM flow, and 35 head feet pressure. Grundfos UP26-99F looks close.
++From your guess, I would guess that your house is three stories and you are trying to get the water up to the third level. It is a common mis guidance.
Here is the way to figure out pump head requirements: Read 'Select a circulator' at:
http://www.heatpro.us/
Under the 'Designing a Series Circuit' listing.
Most radiant systems are designed for ordinary residential circulators; high head pumps are a disaster-in-waiting. Read the Pumping away section also.