rocket mass heater measurement

  • Combustion chamber height = 2 X pipe diameter / 4 X pipe diameter
  • Combustion chamber external cylinder = 2 inches higher than internal cylinder( higher will weaken the draft)
  • Raise pipe 1 in for every foot length

4 inches combustion chamber is good for home, taller combustion chamber gives clean heat:

8 inches combustion chamber:

The usual ratio of feed, tunnel, riser is 1:2:4. A clean burning rocket also depends on an insulated j tube.: