Side note: due to the nature of combustion of oil fuels, the use of heating oil, kerosene, diesel, waste oil to run a paint booth forces you to go to INDIRECT FIRE heating. This relies on a heat exchanger to do the heating and by nature you will lose roughly 30% of your fuel efficiency. If gas or propane is an option, go with that. You will be able to use direct-fire heating in your paint booth and your fuel efficiency will be nearly 100%. See more on paint booths with indirect fire heat.