Based on my calculations, my pool is about 500 sq ft. and about 16,000 gallons. I live in a warm climate. Currently (in early March), the pool is at 66 degrees and I would like to bring it to 80 degrees. I'm willing to buy a solar blanket. Do you think that 150,000 BTU heater will do the job?

From the energy.gov website:

*-To calculate the size of a heater you need: Pool Area x Temperature Rise x 12*

*-This formula is based on 1º to 1-1/4ºF temperature rise per hour and a 3-1/2 mile per hour average wind at the pool surface. For a 1-1/2ºF rise multiply by 1.5. For a 2ºF rise multiply by 2.0*

So I would need 500 sq x 14º x 12 x 1.5 = 130,000BTUs to get the pool heated in between 9-14 hours. Is something wrong with my math? Seems like the small heater should be enough no?

Thanks in advance for any help you could give me.