Im planning to put a rocket mass heater in a 3000 soft greenhouse. I have several ideas of how I would like to do it. If anyone has experience, I would like to ask you some questions.
1. Can I put the feed on the outside, run the burn chamber under the wall, and the riser and the bell inside. 2. Then run the exhaust pipe under the ground over 100ft to exit under the wall on the other side? Can I run the exhaust that far? I’m sure I will lose some btu to the ground, but I would think the majority of the heat would radiate up into the greenhouse. Do you think this length of run would reduce the air pull and if so, could I add an in-line fan at the end to help pull the air to the end?
How safe do you think it will be running the burn chamber under the wall and if so, how long can I make the burn tunnel?