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I tried that about 30 years ago and I couldn't get the darn things to stick together very well. Then my state enacted a deposit law and there went all the free raw materials. If I was going to do it today, i would use my stove pipe crimper to crimp one end of the can, then assemble the cans like stove pipe with two screws in each one which should make a stronger section of pipe for a heat collector. I am talking about a hot air system, not hot water.
 
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