Pex Plumbing System with a Boiler

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Old 04-13-13, 11:00 AM
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Pex Plumbing System with a Boiler

Hello,

My family just bought and moved into a new home. My parents had a hydronic heating system in their house. The heat was always comfortable there so I was excited to see it when we looked at this house.

I need to do some plumbing work on the water supply. I have read about using oxygen impermeable PEX on the lines between the boiler and the radiator. That's not what this post is about.

Can I use non-oxygen impermeable (without the special lining) PEX on the water supply for my house. I see that the boiler is filled from the hot water supply, so if I'm thinking correctly, I cannot use the non-oxygen impermeable on the hot water before it Tee's into the boiler fill line. What about after that?

I am happy to post pictures and explain further, if you can get me started. Thank you for your time!

Nathan
 
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Old 04-13-13, 11:45 AM
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I see that the boiler is filled from the hot water supply
What do mean by this? Boilers are usually fed from the cold water supply line. Is there some sort of tank that heats the water before it gets to the boiler?

Yes, some pics would help immensely.
 
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Old 04-13-13, 02:00 PM
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I've seen feed from the hot water line before. Not sure why some guys do this, it's not necessary, but it won't hurt anything.

Basically anything on the potable side of the system can be regular old PEX tubing.

Anything on the 'closed' boiler piping needs to be non-permeable tubing.
 
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Old 04-14-13, 06:38 PM
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For Rockledge,

I have attached a picture of the area in question. The cold water enters the water heater on the (looking at the heater) right (CPVC to copper). Hot water comes out the left (copper). The hot water supply comes toward us, then takes a right turn, then goes upward to a tee. The tee feeds the boiler and the potable water supply. Should I redo this?

For NJTrooper,

Do I need to concern myself with oxygen getting into my boiler through the feed line and rusting it out? It appears from your response the answer is "no."

Thank you both for your insight!

Nathan
 
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Old 04-14-13, 08:54 PM
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Do I need to concern myself with oxygen getting into my boiler through the feed line and rusting it out?
Incoming water is already saturated with oxygen so the ordinary PEX is fine. Yes, oxygen WILL enter with the make-up water but unless you have leaks you won't be taking on make-up water so no problem.
 
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