IBC 275gal totes are 40" x 40" x 50" high
((40 x 50 x 4) + (40 x 40)) / 144 = 66.66 ft2 surface area not insulated.
In post #1 I made mistake of including top of tank.
3/4" pex has 1" outside diameter, circumference = 3.1416"
(3.1416 x 12 x 255) / 144 = 66.76 ft2
So exposed area of tank is about the same area as 255' of 3/4" pex.
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