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I can assure you that there is no hidden coil already in my tank.
But yes, you are correct that a coil INSIDE would be much more efficient.
That's basically the plan right now, is to cut the top off the tank so I can make my own coil to place inside the tank.
No I am not using glycol yet, as I am still just experimenting. Water works great, is cheap, and I have no problems with spilling it on the ground.
One thing I should do is completely fill the panel with water, and then drain it all back into a bucket to measure. That, plus a calculated amount of tubing should tell me exactly how much anti-freeze I will need to buy.
I did find a home improvement store that carries "Hydronic & Solar" antifreeze by the gallon and 5-gallon containers. It costs about $15 per gallon, but I really don't think I will need too much.
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