How many BTU needed to operate 30000 gallon pool at 80 degrees?

Answer 1

It takes 8.34 BTU to heat 1 gallon of water 1 degree F.

Take 8.34 BTU times number of gallons to determine energy needed to raise pool 1 degree F. Then multiply by how many degrees you need to raise the temperate of the current pool temperature to the desired temperature.

Example: 8.34 * 30,000 gal = 250,200 BTU need to raise temperature 1 degree F

Next multiple by the number of degrees to warm, say the pool is 55 F. 80F - 55F = 25F.

250,200 BTU * 25 F = 6.255 million BTUs to heat the pool to 80 F. This does not take into account the loss of energy to the surroundings but gives you a starting point to determine the energy needed to heat a mass of water.