sizing circ. for radiant floor

flash

I have a garage with 16 radiant loops in concrete, each loop is 250 feet long, they are all going into a single header, and the tubing is half inch pex, could you tell me which circ. i should use? the header is a 11/4 copper with 1/2 stubbs off of it.

GW

a big one

what is the sq footage and how many btus do you need? All one zone??

Gary

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GW

what is the tubing spacing?

and secondly, are a heating contractor?

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GW

I've got

a small one doing the trick. you need more flow than you need head loss

250 foot run with 200' of actual heat (average 50' runs to get to the manifold)- 12" spacing- 200 sq ft at 25 btu per foot- 5000 btu per loop- 1/2 gpm per loop- 8 gpm total-about .02 foot of head per foot (stadler chart) on a 250 foot run is 5 feet. SO get a pump with 8 gpm at 5 foot of head.

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GW

I would

reverse the return though

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