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Forgot to mention the concern over pressure and flow. The issue is that the units turn on when they detect FLOW of about 0.5 GPM. If you like to trickle your hot water they probably aren't for you. I found that this was never an issue but that's just me. I think if you do a test you'll find that .5 GPM is pretty low for most folks.
As far as I know they aren't sensitive to pressure in anyway. However, if you're pumping with one, say with a domestic heating circulator pump you have to make sure it can make sufficient 'head' pressure since they have small tubing inside. Normal water pressure of 40 pounds or so is not going to have any issues with these things.
In an RV where you are using it for hot water only, you'll have 40 pounds of differntial pressure across it no matter how many faucets are open. If it's sized correctly you'll be able to scald yourself at each for a very long time.
BTW I bought mine about 6 years ago for $600 on the internet. It's about the size of a small suitcase.
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