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Originally Posted by Iceni John
The minimum bend radius is still an issue with PEX - can you gently heat it (such as with a hair dryer) to soften it enough to bend without buckling?
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My son who is an engineer of motorhomes says that one of the nice things about pex is that it has a memory. If you put a kink in it you can heat it up and it will go back to it's original state. IE:no kink. So if you heat it it will try to straighten out.
This info from Pexsupply.com
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Typically, with standard PEX tubing, you can expect it to have a bend radius of 6 times its diameter. Therefore, if you have 1/2" PEX tubing, the tubing will have a bed radius of about 3", making PEX tubing extremely flexible, compared to other types of tubing.
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I think you would have more trouble with the vinyl stuff trying to bend it that tight, my experience is that it kinks quite easily.
Just out of curiosity, why do you think the bend radius is a problem with the cold and not the hot? Aren't they basically going the same places?