74M35A2
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No, he means an "M67" which is a military fuel fired heater designed to heat 30 or 50 gallon drums of liquid. It basically looks like a 4" stove pipe that drips liquid into the bottom and burns. I think it is rated at 30k or 35k BTU:
http://www.military-tent.com/imheunco.html
I calculated roughly 75k BTU of actual water temp increase of the wood fired heater I made, not counting the heat radiated from the barrel stove or its chimney. This was 450 gallons of water rising 5F every 13 minutes, so you'd need 2.5 of the M67's just to match the performance. I wanted to use finned tubes like a trans cooler within the drum, but could not readily find one with threaded fittings.
http://www.military-tent.com/imheunco.html
I calculated roughly 75k BTU of actual water temp increase of the wood fired heater I made, not counting the heat radiated from the barrel stove or its chimney. This was 450 gallons of water rising 5F every 13 minutes, so you'd need 2.5 of the M67's just to match the performance. I wanted to use finned tubes like a trans cooler within the drum, but could not readily find one with threaded fittings.
