[Cob] cob/earth oven also heating hot tub intake?

[tabitha and karl o'melay]

one of the fist criteria was to do more than one thing with the heat 
source. that precludes using the fire or the absence of fire to control 
the water temperature.

a coil is generally understood to have little bendy parts
http://dictionary.reference.com/search?q=coil
to make up the spiral. if there is an industry specific definition of 
the word coil that i am not privy to--then please cut and paste it in 
your retort--a really large font could be used for this too.

i can't imagine recommending more than the bare minimum of penetrations 
(say two) into the stove. they don't expand and contract at the same 
rate--i'm sure you already know that. if we are using "iron pipe" like 
you suggested--i've only been able to purchase it in straight 
lengths--that doesn't leave much surface area in the actual heat 
source.

i thought this cob-list was about the exploration of knowledge & ideas 
from a living source. when participants get smug and pontificate the 
process of learning is lost. ideas, no matter how ridiculous they seem 
to you, are still ideas and should be able to be put out there without 
fear of getting a persons head chopped off.

k-)

On Dec 31, 2004, at 10:38 PM, KC Chandler wrote:

"your hottub is a (very large) safety valve" is true unless the
  overheat mechanism isolates the "fire loop" to stop the hottub heating 
process.
With all due respect... we're over-thinking it here. You plumb it like 
any water heater, pulling the cold water off the bottom, through the 
coil in the stove. Heat rises. Of course it will create its own syphon. 
It can't do anything else. 


 iron pipe is a good solution for a hot tub but plumbing can be tricky
since the fitting connections (t-tape, pipe dope ect) usually leak when
exposed to extreme heat and especially open flame.

 The fittings don't go into the stove; only the coils do. Your fittings 
are outside of your heat source.
  Your problem won't be in overheating the hottub (let the fire go out) 
...it's not likely that you can heat it faster than the water in the 
tub can cool, even if a small tub, even if it's covered.
  But, I'd be interested in seeing someone try.