Recommend 400,000 BTU heater
Approx 4.4 gallons per hour on full blast.
400k btu
22,000 pounds of water is 2,634 (2,634.73054) US gallons.
A lot. If you know the depth of the pool, you can actually calculate the volume in cubic feet. Then multiply by 7.48 (the number of gallons per cubic foot) to determine the amount of water in your pool. For example, assuming the average depth of your pool is 5', the volume in cubic feet is (16'x36'x5') 2880, which is 21,542 gallons (2880 x 7.48).
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25,000 Gallons
It depends on the size of the pool but 20,000 gallons is pretty common.
Assuming your pool is round about 800 gallons.
264 gallons is the max if it's a blow-up pool.
Is the pool a circle? Do you want US gallons, or Imperial gallons?