I have successfully used homebrewed water heater loops through woodstove
fire boxes for many years. Doesn't
HAVE to be a "coil" but coiling does save space. The latest one was what
you might call serpentine using S.S>
elbows and nipples (assembled then welded) 2 inch. Works fine. The only
time I had a Holt-style "Boom" was when
I inadvertently let it freeze by not draining it completely in freezing
weather. First fire before it thawed DID
let some steam out in an impressive manner. Take care to provide
drainabillity, of course. Nick Houser, Off Grid
Services, Powell River, BC.
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