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Adding fin tube to a radiant floor heat system

I have a radiant floor heat system that does not quite heat my home well enough it goes down to about 60 in some areas of the house I would like to add fin tube to heat these areas up. Problem is the return water is only 130 degrees supply goes out at 167. I would like to increase flow but it will not go over 2.1 gallons per minute thru both manifolds (I have a 2 port for 2 bedrooms and a 3 port for the living room bathroom and kitchen) the bedrooms are controlled by a separate thermostat. Each zone has its own circulator pump a taco 007 pump 1/25 horsepower. Could I add an additional taco 007 pump on the return side to increase flow? How would I wire this so it goes on with the other pumps? Head feet is about 6 feet.
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Comments
You can choose to do what you want, but you cannot choose the consequences.
What kind of radiant install is this? 167 is very high for a radiant supply temp, is this staple up? Is there insulation below the tubing?