Don wrote in message . ..
There are 2 advantages only, one is space saving. They can be hung on
the wall and do not take up floor space, next is you do not have to
heat the water stored in the tank. They are much more efficient.
Unless you want to rewire, repipe, and reflue your entire house, they
will still be placed in a central location and 1 unit will feed the
entire house/building. No matter what, you will still have the heat
loss in the standing water in the pipes, just no heat loss from water
stored in the tank. Basicly you will just heat the water to be used,
thus the savings.

Don
Been there, done that.....

I believe one of their chief advantages, and one that figures
prominently in the marketing, is that they are *endless*. They will
heat water for as long as you draw it. Once a month you let the
soccer team shower at your place? And then you want to fill the hot
tub? No problem - until the gas bill comes.

Now, multiple *concurrent* showers, that has to be reckoned when you
buy the unit.

So, I see them as being of benefit to big families, or guest houses,
or anyone who finds they occasionally empty even a large tank WH.

However, in the literature for some of the units, it mentions a
60-second ramp-up time. IE, your water runs cold for a minute, *after*
you get past the water standing in the pipes. That could get tired
fast. Do owners see this in the real world?

Chip C
Toronto

[ I have deleted hsv.general from the posting list 'cause I have no
idea what that group's for.]