What is the best Natural Gas Heater for a 750 SF pool?

Another plug for getting the largest heater (in BTU's) that your current gas configuration will support. It takes a given number of BTU's to heat a given water volume to a target temperature. A larger heater will do the job faster while not using any more total BTU's (vs. a smaller heater) to heat the water to your target temperature.
 
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