Response to I am not sure what the total gallons is, I will need the average depth of the pool and the shape of it to calculate total gallons. An example; if this pool is 20,000 gallons the minimum BTU size to install is 167K BTUs. If you selected to order the 206K BTU for a 20K gallon pool it would take approximately, 1-hours and 10-minutes to raise the temperature by 1-degree. Please see Swimming Pool Calculations acalculations.aspx and How Long Does It Take to Heat a Pool?

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