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(that's assuming you don't take into account surface area) ?

How many btus if you took into account the surface area of a 64oz soda bottle ?

What I did was,

1 BTU will raise the temp of 1 lb of water 1 Deg F

64 Oz bottle, 4 lbs of water

30 Deg Temp diff, 30 x 4 = 120 Btus

3.4 Btu's per watt

120/3.4 = 35.3 watts