I have an old fuel oil hot water heater and would like to replace it soon. Any advice on what to replace it with? I have a fuel oil boiler as my main source of heat. My debate thus far is between: 1. electricity 2. propane (get a tank and eventually convert the boiler to propane as well) or 3. possibly an indirect system (use the boiler to heat water too and year around). Natural gas is not an option and I have a Lopi Declaration as a supplemental heat source too. Any thoughts/info/advice would be much appreciated.