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Home Made / Gravity feed pellet burner, requesting help with heat exchanger

« on: January 23, 2011, 04:10:18 PM »

Greetings, I created a gravity feed pellet burner. The pellet burner works very well. It has a 8 hour unattended burn time. My challenge now is to recover as much heat from the pellet burner and transfer that heat into the building. My first attempt using a stainless elbow positioned over the flame to heat the air inside the vent has failed. Basically the project is to have a fire box outside the building and then try recover as heat as possible and transfer that heat to inside the building.  I am looking for ideas that are low cost and easy to fabricate. I found some videos on youtube showing heat recovery systems. If anyone has any other ideas please let me know.
Best regards.

Gravity Auto-feed pellet burner

Pellet Burner with Gravity Feed and Heat Exchanger