I was looking to get rid of our old oil boiler. Crunching the numbers on heat pumps and their efficiency at certain temperatures, I was surprised to find that

I was looking to get rid of our old oil boiler. Crunching the numbers on heat pumps and their efficiency at certain temperatures, I was surprised to find that a propane boiler actually came out ahead. And propane isn't cheap where I live. I decided to put in a modern wood stove instead.