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Hey everyone.... This question is regarding a snow melt system with a mixture of 30% glycol....from the manifold through the 5/8" pex loops (6 of them) the GPM for all 6 of them is 6.84 GPM(1.14GPM per loop)....The head loss for the MANIFOLD is 4.5 ft HD....my question is how do I figure the size of the pipe from boiler to manifold (snow melt load=81,225 btuh/h) do I use 1"?....and how do I find the head loss from boiler to manifold, and do I add it to the 4.5 ft hd from the loops?....need this to size pump...thanks Paul S