Gas lines for pool heaters are typically installed by licensed professionals who specialize in gas line installation and have the necessary training, experience, and certifications to work with natural gas or propane. These professionals include licensed plumbers, HVAC technicians, and gas fitters.
It is important to hire a licensed professional to install the gas line for a pool heater to ensure that the installation is done safely and in compliance with local codes and regulations. The professional will have the knowledge, tools, and experience to properly size the gas line, make the necessary connections, and perform any required pressure testing to ensure the system is working properly and safely.
It is also important to note that if you want to install a gas pool heater, you must check with the local codes and regulations first, as some places may have specific rules and regulations regarding the installation of gas lines for pool heaters.