Propane can be moderately cleaner than oil. Depending on the age of your boiler,...

		maxerickson on Aug 23, 2016 \| parent \| context \| favorite \| on: July was the hottest month ever recorded, accordin... Propane can be moderately cleaner than oil. Depending on the age of your boiler, you might get a big boost in efficiency by replacing it. The difference can be quite substantial: http://energy.gov/energysaver/furnaces-and-boilers As much as 25% more energy directed into the home instead of out the chimney.

My current boiler is ~85 AFUE.