Using the formula: Amps = Watts/Volts look up the wire size needed in the national electric code book for the amperage of the device. This formula only works for single phase current. If you are using 3 phase, look in the book. In general, 15 Amps or less: 14 Ga Copper wire. 20 Amps or less 12 Ga. 30 Amps or less 10 Ga. Anything more than 30 amps, look it up in the book.
It works this way. Even if you could set the thermostat at 200 it will not heat the water any quicker. It sounds as if you have an undersized heater. A larger heater will heat the water faster if your system can upgrade to the larger size heater. Your house will not heat up any faster if you set the thermostat to maximum. It is the output capacity of the heater that determines how fast it will heat. What dictates heater size is: the size of the gas line. the length of the gas line run from the meter to the heater. the size of the meter. how many GPM the pump is producing. the GPM capacity of the filter. the size of the plumbing in you pool ~ 1.5"; 2"; 3" total gallons in the pool. are among a few. Just common sense here...... k
At a minimum you would need a 400K btu gas heater. This pool is larger than a 20 x 40' pool or 800 sq. ft. Many things dictate the size or sizing of a pool heater such as the surface area of the pool, the size of the gas line from the meter to the heater, the distance of the run from the meter to the heater, the size or capacity of the gas meter, etc. Proper sizing is a must if your heater is to run at optimum standards.
In order to properly size the wire per National Electric Code (NEC) standards you will need to know the amperage and the distance of the device (heater) from the source (circuit breaker panel). In order to know the amperage one would need to know the voltage since amperage changes inversely with voltage.
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