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Old 01-09-2010, 07:37 PM   #1
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Hot Water Baseboard return with Pex?


I have slant/fin 30a baseboards. I cant run a normal return, i need to double it back on itself and have the return inside the baseboard as well. This portion of baseboard is all on slab. Is it possible to run pex (with o2 barrier) inside of the baseboard, or do i need to do this whole thing in copper? Thanks guys

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Old 01-09-2010, 07:42 PM   #2
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Hot Water Baseboard return with Pex?


I would say if local code permits it the pex is fine. I have used it several times for baseboard.

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Old 01-09-2010, 07:44 PM   #3
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Hot Water Baseboard return with Pex?


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Originally Posted by JohnH1 View Post
I would say if local code permits it the pex is fine. I have used it several times for baseboard.
I know the pex will work, i just didnt know if it was taboo to do since the fins could cut the pex.
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Old 01-09-2010, 07:47 PM   #4
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Hot Water Baseboard return with Pex?


Pex is very tough. I dont think there any way the fins could damage the pex.
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Old 01-09-2010, 08:03 PM   #5
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Hot Water Baseboard return with Pex?


thanks john, i was hoping that would be the case, looking forward to not having to solder more pipe in that cramped space

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Old 01-09-2010, 10:12 PM   #6
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Hot Water Baseboard return with Pex?


Run the pex under the element, and fasten it to the brackets, not the element.
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Old 01-09-2010, 10:53 PM   #7
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Hot Water Baseboard return with Pex?


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Run the pex under the element, and fasten it to the brackets, not the element.
Ill take a look to see if this is possible, I would imagine this would be a better scenario as gravity would take the pex away from resting on the fins. However, it looked like there was very little room below to attach to.
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Old 01-09-2010, 10:59 PM   #8
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Hot Water Baseboard return with Pex?


And the more room between the pex and the element, the better the heat transfer from the element.

having it rest on top of the element, lowers the heat output of the element. As it restricts the air flow.
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Old 01-09-2010, 11:03 PM   #9
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Hot Water Baseboard return with Pex?


Yeah i heard the return line in the baseboard can cut heat output by more then 25%, but my options are limited with the slab
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Old 02-01-2010, 05:23 PM   #10
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Hot Water Baseboard return with Pex?


This is what i ended up coming up with, I ran the line on the underside of the baseboard, but i did not like the way it looked as some of the line was visible.
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Old 02-01-2010, 06:00 PM   #11
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Hot Water Baseboard return with Pex?


Pex expands a lot and I have seen it push the cover off the baseboard. I would use copper till I hit the drop.
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Old 02-01-2010, 08:10 PM   #12
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Hot Water Baseboard return with Pex?


Hope it isn't pulled up tight against the bracket. Or it will rub through.
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Old 02-02-2010, 10:45 AM   #13
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Hot Water Baseboard return with Pex?


I think i pulled them pretty tight, i will have to loosen them all up.
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Old 02-19-2014, 09:01 PM   #14
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Hot Water Baseboard return with Pex?


Hi gnosti83, I know it's been over 3 years since this post but I'm hoping to get some info about your inside baseboard return using PEX.

what did you use to make the bend from the fin/tube connection? two 90 elbows or a return bend? if return bend, was it 3/4" 2" center-center? I see return bends on the net but most are 2 1/2" center to center. I'm also curious if you used push fittings such as sharkbites. I too have to add some baseboard over a slab level.
Thanks,
-asb313
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Old 02-19-2014, 10:10 PM   #15
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Hot Water Baseboard return with Pex?


see if this opens for you. This is what i used with one of those pieces vented to release air.

https://plus.google.com/photos/10957...09612780499057

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