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Circulator for Primary Loop
Changing heating unit to an HTP Elite modcom boiler with an HTP indirect Ultrastor 60. I have infloor radiant with 11- 300' loops and a Taco 011 pumping to them all with a pressure differential bypass valve installed. At present it is a closed system running through a heat exchanger and I understand that I will eliminate that HX with the new boiler and that I will pipe direct from the boiler and I will need to add a primaryloop with closely installed tees and a circulator for the boiler and another for the indirect. My confusion is in the understanding about what circulator to use for the boiler primary loop. The chart with the boiler says that I need a range of 8-12 GPM flow with a corresponding pressure drop of 15'-33'. Does that mean I need to look for a pump with that flow rate and also 15-33' of head? I think i'm confusing pressure drop with head here and it's just not connecting in my brain. That would be a rather large pump so I guess that it not right. Can you guys help me to understand what I would need here and how I'm misinterpreting this pressure drop/GPM chart. Perhaps a suggestion for the circulator on the indirect also.