Waste Oil (used crankcase oil up to 50 wt)
#1 & #2 Fuel Oil
Hydraulic fluid
Automatic Transmission Fluid
Synthetic oil (up to 25% blend)

* Stay away from gear lubes, they do not burn and will cause you more maintenance for ANY brand waste oil heater.
* Hazardous waste is illegal to burn in ANY brand waste oil heater.
* The EPA of the USA does not allow the burning of Brake fluid, and it is illegal to burn in ANY brand waste oil heater.
* There is no UL safety standard for the burning of Used Cooking Oil (vegetable oil) at this time. It should not be burned.

* Note: International customers should check their local regulations, as ‘what you can legally burn’ may change.