13000 gal pool need gas heater how big?

The size of gas heater you need for a 13,000-gallon pool depends on several factors, including the climate in your area, the desired temperature of the pool, and the efficiency of the heater. Here are some guidelines to help you choose the right size gas heater:

* For moderate climates, you can typically get by with a heater that is rated for about 100,000 BTU (British Thermal Units) per hour.

* For colder climates, you may need a heater that is rated for 150,000 BTU or more per hour.

* If you want to be able to heat your pool quickly, you can choose a heater that is rated for a higher BTU output.

* If you are concerned about energy efficiency, you can choose a heater that is Energy Star certified.

Gas heaters are typically powered by natural gas or propane. Propane heaters are more energy-efficient than natural gas heaters, but they can be more expensive to operate. You should also factor in the cost of installing the heater, which can vary depending on the complexity of the project.

It is always a good idea to consult with a pool professional to get an accurate estimate of the size and cost of the gas heater that you need for your pool.