Shawn, you're correct I accidently linked the wrong unit, ours would also need to be a LP model. Good info on the hard water, that fact alone might rule out these units, our water leaves residue on our glasses if not dried properly.
I also like Mike's suggestion of the heater/boiler but unless it has a energy saving value I'm sure my wife would veto it.

A computer once beat me at chess, but it was no match for me at kick boxing.