Garage Heat?

Only problem with a "cheap" oil install over gas / LP is the chimney cost. Oil requires a class A chimney system just like wood You cannot use the cheaper "gas" "B" vent for oil.

You CAN fudge on this depending on the install. Years ago, a buddy had a metal shop building, we "made" vent out of two sizes of heavy wall galvanized. Took 6" and screwed it together, then put it inside of 7" to make double wall, then e'lled it out of the gable end of the shop, with metal standoff brackets, all fabricated.

This worked well and was carefully bracketed for fire clearance to combustibles, but it would probably never have passed a persnickety code inspector, even though it was perfectly safe.

Also bear in mind that ANY electrics or burner in a garage situation should be 18" and better to be 24" off the floor in a shop / garage.