I decided a few months ago to upgrade our domestic hot water to a hybrid heat pump water heater. We will be buying this device soon. We won't need to burn propane to serve our hot water needs. This new hot water system will save us significantly on our energy needs. Eventually we will hook this into a solar system as well and to offset our energy useage.
Meanwhile we have added a large amount of insulation to our cellar to close gaps in the foundation of our over 100 year old farm house. We will also be super insulating the attic.