RMH Temperatures at different points

We are most concerned with temperatures from where the stove pipe meets the ceiling to the end of the chimney pipe. We are working with a limited budget, so if the temperatures are low enough, can we use single walled stove pipe in that section?

Has anyone measured the temperatures at different points? I found a person on this forum who did, but the max temperature was only somewhere near 500 or 600. I also saw a YouTube video where someone guessed the temperature where the stove pipe meets the ceiling to be around 110. Does that sound right?

There's an already existing furnace chimney. We are thinking if connecting to that. The stove pipe will be at close to a 45 angle after going through the ceiling in order to connect to the preexisting furnace chimney. Will that reduce the speed too much? Anyone tried doing this?

Bryan, thoses are temps taken from outside the bell and pipes of my Bell batch rocket.


Bell, on top, at full burn temp 110C°

pipe at 7m from the bell, at full blast, 65C°

Before i had a J tube, the tube wouldn't go over that 65C° temp either. Mostly, it was cooler.

I don't think they are. My apologies for not being specific and as clear as a could've been.

All temperatures I listed are in fahrenheit. Here are the sources: YouTube video (http://www.youtube.com/watch?v=Medsq0KlqCo&feature=share) and Permies Post Graph (https://permies.com/t/24654/a/8984/RMH%202013-04-16.png). Here's the note link to the permies post (https://permies.com/t/24654/rocket-stoves/Temperature-Sensors-Rocket-Mass-Heater).

I've never heard of a bell or bell batch rocket in rmh. You have a link for more info on that?

Hi Bryan; Yes, you can use single wall pipe when exiting your roof. My 8" system uses hvac pipe for the straight runs and black steel on the 45 degree turns. Average pipe temp is around 100 degrees on the hvac pipe and 150 degrees on the black steel. The top of my barrel runs over 1000 degrees at full roar. My exhaust pipe is inches from wood studs as well as the plastic roof of the green house. temps are not a problem in this part of the system. As far as using your existing chimney , I would recommend not using it and make a new exit for your rmh.