The tippy-top of Rocket Mass Heater technological understanding!
The latest cutting edge R&D! The Heat Riser: demystified!
Penned by Rocket Mass Heater authorities Paul Wheaton and Chris "Uncle Mud" McClellan and updated Summer, 2022, this eBook features a heap of information about heat risers - how to build one, what to use, how much to spend, how long it'll last. All this info for the first time in one place!
This is the 2nd chapter of their RMH book that doesn't even exist yet!