What heater do you use?

I run a 10 year old 100,000 BTU hayward on a 18' dia pool. I can pull a solid 2 deg/hr in warm weather. Cost is around $1.00/hr based on my nag gas costs. This is not a recommendation on Hayward heaters though as mine is Far from factory stock in the control system area. Modified from my years of working in the heating system business.

As far as time to heat, the basic formula is the BTU output divided by the weight of the water in your pool
 
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