Quote:
Originally Posted by berniebenz
Could be improved. Will have poor heat transfer because of very low water velocity in contact with cu tube. Water will flow straight thru the center.
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It is a "tube in shell" (official term, if there is such a thing). Assuming it is placed vertically at the bottom of the tank, it will heat the body of liquid within it which will simply rise to the top of the tank, drawing from the bottom. No pump necessary.