I live in a VERY hard water area. I found that Hunter units let me clean
the accumulated limestone residue with vinegar better than any other I
ever used. They come with 2.5 gallon and 3.5 gallon tanks.

I bought mine from

http://www.dmartstores.com/hunter2.html

Bob M. wrote:
Where can I get a decent-sized room humidifier?

I have hot water (baseboard) heat so *adding ductwork is not going to
happen*.

I have a 2 or 3 gallon humidifier that works OK, but what I want is something
with a 5 or 10 gallon (or more) capacity so I don't have to fill the thing
every two days.