Purchased a Master 75,000 BTU forced air heater at Tractor Supply this week. The label states at it will burn K1 kero, JP8/Jet Fuel 6, #1&2 fuel oil and diesels. Fired it up this morning on #2 ULSD Shell diesel and seems to burn fine as I did not have any K1 at that time. Anyone using diesel in their torpedo heater besides me, if so, any down the road potential problems as far as soot or dirty filters? Seems like I read once that diesel fuel has more BTU's per gallon than any other petrol source. In my area D2 is .50/ gallon cheaper than K1 which makes it a bit more economical. Opinions or advice welcome.