The Clean Burn Heat Exchanger
It is simple physics. The more surface area exposed to a combustion chamber, the more heat you will capture. The more time room air circulates around a heated surface, the warmer it becomes.

There's nothing else in the world like the remarkable Clean Burn Heat Exchanger. Compared to inexpensive Blast Tube furnaces, which feature a simple cylinder shaped combustion chamber, a Clean Burn Heat Exchanger provides approximately 200% more surface area for capturing combustion heat. You get more heat from less oil.

The result is a lower stack temperature, more economical use of your used oil, easier maintenance and longer service life.