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Pex Al Pex pipe sizing and Tees

DYIPittsburgh
DYIPittsburgh Member Posts: 11
in Gas Heating

Hello.

I'm working on replacing gravity piping system. I kind of jumped the gun and purchased, based on a recommendation, 1" Pex AL Pex. I am running a 2 pipe hydronic serial reverse return piping system (Ts to each radiator for supply and return). The new boiler I'm considering is the HTP Elite FT Ultra 110,000BTU (96% efficient). Will the 1" Pex AL Pex mains for the supply and return work? I have 12 radiators(5 bedroom floor and 7 first floor). I might zone each floor, but not sold on that idea yet. Not certain if that even matters for the pipe size.

Based on above:

3/4" pipe 4,5000,btus=4.5 GPM

1" pipe 80,000,btus=8 gpm

1 1/4" pipe 140,0000 btus=14gpm

So, at 110,000BTU, will 1" work okay? The pipes going into the radiators are 3/4" steel. One minor or major final comment, I noticed the Pex AL Pex connectors reduce the inside diameter of the Ts and Elbows.

Will the Tees need to be mono-flow?

Thanks for your comments!

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