I am interested in on demand hot water systems. I want one for a cabin
where we need fairly hot water, but don't want to keep a lot of water hot
all the time. Plus, in the winter, we use water from a tank, so need to run
it through a separate line inside the house that won't freeze up.

Anyone have experience with these? Brand name suggestions? Caveats?
Sites? Prices?

Our plumbing all comes up through one tree, so it would be easy to run three
faucets from one, since we would only have one open at a time.

Suggestions appreciated.

Steve