 What is the oldest furnace that is still in use?
The oldest kind of oil furnace you are likely to encounter will be connected to a gravity warm air heating system that was designed to burn coal and has been converted to oil. As the name implies, the air to heat the building is circulated by gravity, warm air rises and cold air falls. There is no fan to move the air around. Older Oilheat systems were good in their day, but the technology is from the 1930s. Oilheat technology has come a long way since then.
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