I checked the specs of that unit and it says:
> Water Capacity (Gallons Per Day): 11.5 to 34.6
So you're not going to be saving any water vs. existing system
Sure, my pleasure. The unit that I have is this:
http://www.amazon.com/Aprilaire-800-Residential-Steam-Humidifier/dp/B005DS4YY2
From what I understand, the installation can be DIY, but, well - not for people like me. The only maintenance that really needs to be done on it is to replace the $50 canister once yearly. Probably the biggest caveat is the fact that there needs to be a water line nearby - though, most utility rooms have a water line, apparently it's a little money to have a plumber do the hookup.
I'm really happy with the humidifier. Like I said, it definitely beats filling up reservoirs, manually adjusting the humidity constantly, cleaning out sediment, etc. It's really "fire and forget," for the most part.
Hope this helps!
The best thing I've found for hard water areas around here is this http://www.amazon.com/Aprilaire-800-Residential-Steam-Humidifier/dp/B005DS4YY2
It's Expensive, but it's designed for hard water areas and very easy to service. I've installed a few of them and have heard nothing but good things.