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[MiHawkeye]

I recently got a 50 plate 3X8 heat exchanger with 3/4" fittings on it.  My pex tubing is at 1".  How big of an issue is this going to be going down from 1" to 3/4" for this?  I understand it is limiting the flow, but how much is the flow limited by the plate exchanger anyways, since it goes down to much less than 3/4" through the plate.  There is a 5X12 50 plate exchanger with 1" fittings on it that I could possible acquire, but it won't be here until about halfway through the season, and I'd rather have this installed before starting up the boiler.

[mlappin]

It will cause some of course, but if you measure the ID of your 1” pex line it’s not actually 1”, just a little under 7/8” if I recall correctly while 3/4” pipe is a true 3/4” ID.

[Bondo]

Ayuh,....     Unless yer countin' calories, it won't matter,...

[Big Wood]

The fittings you put in the end of the 1"pex will shrink the size down
So it will be  for the better to use the 1"pex so go for it  and have hot water

[Drivebymashing]

Mine has 1 inch on the plate exchanger. I had to use a 1 inch to 3/4 adapter for drinking water side.

(By the way what does "Ayuh" mean Bondo?)