Knife Kiln vs. Furnace vs. Oven? All three of these names refer to a fireproof box that gets hot. No matter what you call it “the box” needs to have the capability to get to the desired temperature and stay there for the prescribed amount of time. It also must to have the ability to heat and cool at the prescribed rate for the particular process required. Most importantly, it must be safe and easy to operate, and last a long time. From this point forward, we’re going to refer to all the options as KILNS. What you really need to know is how much space you need, what temperature do you need to get to, and how long does it need to hold at that temperature. Here is a link to a guide that you can use as a reference: The Heat-Treating Data eBook.