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Rocket mass heather pipe for Green House

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I am installating a greenhouse which is 30meters long and 10 meters wide. I would like to use about 3 rocket mass heaters to heat the soil. What type of pipe to you recommend I use that is fairly cheap Metal, Asbestos, etc? I need about 100meters of pipe, because I want to install 3 mass heaters outside the greenhouse and run 3 pipes under ground to heat the soil surface for the plants on top. How deep must the pipe be? Your advice will be greatly appreciated.
 
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That's an interesting project, surely somebody must be able to add their thoughts?
I have something similar in mind and was wondering the same thing. I was also wondering if a smaller diameter pipe rather than the usual 100mm would mean we could use more of it in length. O would it hinder the burn (less draft?) of the RMH ?
 
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