Not sure wtf anyone is talking about anymore.
Here is a nice looking device:
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It has a battery pack which makes it portable, but you might be able to rig it to an external USB pack that has much more power (think phones).
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A device around an [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]extender[/words] that holds water would lose temp over time. You would have to keep refilling/reheating.
Hit the pipe and come up w/ another.
It would be different if there was some type of electrical probe charging the water to somehow heat up collagen molecules.