Neat setup, I know a couple of guys with a large used oil heater and large shop, they where spending a couple of days a week just collecting used oil! They had a outdoor 500 gal storage tank and complained about all shops saying it was "all oil" but they had antifreeze mixed in and on really cold weather the oil and antifreeze didn't seperate and stayed in sort of suspension, causing them to drain the 500 gallons several times a winter! So the idea of indoor storage sounds pretty inviting. However as neat as it sounds our prebuy on propane here in rural MO was $1.05 a gallon last month, right now thats pretty low heating costs for me. Cool heater however and great idea.