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Old 07-20-20, 08:36 PM   #3
Lurking Renovator
Join Date: Jul 2020
Location: Virginia
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I made an air heater this way. I found if you drill the hole in the bottom off to one side, then stack them so hole is on the opposite side from the flip top hole, it gives better heat transfer. I'm not sure if that would matter with water. But I am really anxious to see if this works. Keep us posted.
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