When I was using propane for water heating, it seemed to average about 1
gal/day during the warm weather, when that was all the propane was being
used for. I do have a propane cooktop also but ovens are electric, as is
the dryer. Your drryer probably burns more than my cooktop, so 30
gal/mo sounds pretty reasonable to me. I now have an electric water
heater, and dual fuel heat pumps with propane backup-- no regrets so
far. (Had the W/H about 10 years, H/P's about 5) Larry