Today I'm getting an estimate for the installation of a tankless water heater. From my research, I calculate that we can save $300 per year with one of these. Propane costs $2.40 per gallon here right now, and I can save more if I can make it through the winter on one tank, avoiding fillups when the price is high.

Here's info on tankless water heaters from Dept. of Energy

I'll keep you posted.