It would last until the first hard freeze.
Which is something most of the US has to deal with.
If you used most of your hot water during the hottest part of the day this would be perfect. But for most of us using this with out a storage tank and circulation pump wouldn't really save any thing.
Also where I live, I have seen city water pressure up to 100psi. Let's say it does work a little too well, you heat the PVC up to 150°F and the pipe ruptures somewhere.
If your water pressure is only equal to a column of water as high as a tank on the side of your house then you are good.
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