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I used this method for my crayfish farm and increased the breeding season by 6 weeks.
Basically it was a 8 foot by 4 foot frame with silver foil insulation (roofing insulation) on the back and 300 feet of 12 mm black plastic tube inside the 6 inch deep frame laid carefully in loops (might have been less than 300 feet - it was as much as I could get laid edge to edge) and then run into a manifold each end and piped in 2 inch pipe to the breeding boxes. The front of the box was covered in lexan.
This could just as easily be run to a thermal mass.
The water went up by about 7 degrees per cycle through the plastic. The volume was quite low so if you increase the volume the temp delta would decrease. but in a day, you could get significant heating.
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