Which side of expansion tank?


  #1  
Old 04-04-21, 01:37 PM
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Which side of expansion tank?

I want to tap into my cold water line to run a pipe for a hose spigot.

My cold water line comes up the wall, then has a 90 elbow, then has a shut off valve, and after that is my expansion tank off a T fitting (hanging downward). After that T is my HWT cold flex tubing to the HWT.

I would like to unscrew the HWT flex and tap in right there, so I don't have to do any copper soldering.

Question: does it matter that I would be on the HWT side of the expansion tank? Is there even an in/out for an expansion tank?
 
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Old 04-04-21, 02:19 PM
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Welcome to the forums.

HWT ???
Do you mean HWH.... hot water heater ?
The pressure tank is just tee'd into the cold water line.
You can connect anywhere in the cold water line to add a spigot.
 
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Old 04-04-21, 02:24 PM
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Thanks Pete. Yes, HWH

So no worries about which side of expansion tank, eh? That's good news.
 
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Old 04-12-21, 09:20 AM
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It's a HWT (Hot Water Tank).
Nobody needs a HWH. Hot water is already hot!
 
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Old 04-13-21, 10:07 AM
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So no worries about which side of expansion tank,
Nope, you can add a fitting there if it makes sense.
But it would be after the water heater shutoff, which would be odd. I'm not sure if it would be technically code-compliant as now the water heater doesn't have its own shutoff. It would all work though without an issue.

What plumbing method are you using for your new outdoor faucet?

Nobody needs a HWH. Hot water is already hot!
I recall reading a LOOONG thread on a plumbing forum arguing this. One comment that stuck with me was of course you heat hot water, that's how you keep it hot! Not taking sides in this argument though
 
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Old 04-17-21, 07:17 PM
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I used PEX 1/2" blue pipe to make the piping run.
 
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Old 04-18-21, 05:18 AM
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Everything is fine and dandy except we will have to wait and see if someone with the National Standard Plumbing Code book or the International Building Code book handy chimes in regarding a line to an outdoor hose bibb for unheated water orphaned by the water heater inlet shutoff being noncompliant. Alternatively, may be arguable, although not at length comparable to usage of the words "hot water heater" together in that order.
 
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Old 04-18-21, 06:56 AM
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If you live in a cold area then I think you would have to be able to shut off the hose bib for the winter. Or I guess maybe you already have plans to add a shut-off on the PEX line.
 
 

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