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Rocket Mass Heater- MANIFOLD question  RSS feed

 
Posts: 68
Location: Western Washington State
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Hi,
  I have tried much internet searching on this subject, without luck.

Is there a certain size or CSA that needs to be observed in the manifold??
Also: half barrel vs. brick?
          I have lots of brick and only one barrel (paint still on!), so I was going to go with brick manifold.  I realize that maintenance would be easier with the 2 barrels, but is brick manageable?
      

Thank You!!
Staci
 
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Posts: 2581
Location: Upstate NY, zone 5
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A rule of thumb is to make the manifold cross section three times the area of the rest of the system. This will compensate for common sharp, contorted layouts by reducing the flow speed and thus the friction in this area. The smoother and straighter your connection and transition from barrel to bench, the less you need to worry about manifold cross section.

The Wisners' half-barrel manifold base is clean and simple, but brick can be used just as well if you are careful about how you put it together. A smooth flow path is the most important consideration.
 
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Location: latitude 47 N.W. montana zone 6A
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Hi Stacie;  I used brick on my transition area, works great. As glenn stated 3x the csa is standard but you can go quite a bit larger if you like (sort of a mini bell) and include an access to your horizontal pipe and an ash pit. A check of my posts will show you many pictures of my transition area.
 
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