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Measuring the efficiency of used-oil furnaces is difficult because a clean furnace burns more efficiently than a dirty one. Ash residue from the combustion of used oil builds up inside the combustion chamber and gradually reduces the amount of heat transferred from the combustion chamber to the room air. This means that the precise efficiency level of any used-oil furnace is constantly changing depending on the amount of ash build up, in addition to other factors.
When comparing "apples to apples," however, you will find a striking difference with a Clean Burn furnace. Stack temperature. The lower the stack temperature, the greater the furnace efficiency.
Typical Clean Burn Stack Temperature = 450°
Typical Blast Tube Furnace Stack Temperature = 600° to 1000°
Some people say, "I don't care how efficient a used-oil furnace is. I'm burning free oil anyway." True. But if you run out of used oil because of low efficiency and high consumption, you will soon be paying a lot of money to your local fuel oil dealer to get you through the heating season. Kind of defeats the purpose.
Clean Burn is a more efficient used-oil furnace and is far less expensive to operate over the long term even though it may cost more initially. You can always burn excess used oil. You can't always get free oil if you run out.
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