It should say on the tag inside the cabinet, or on the gas valve. Another indicator is that natural gas typically is fed through a 3/4" galvanized pipe, LP is often run through a 1/2" copper pipe. Be sure before trying to fire it up.
SOURCE: Need wiring information
There are wiring diagrams found in the manual at this site:
https://www.parts4heating.com/v/vspfiles/images/pdfs/EPG_EPM.pdf
SOURCE: I have a natural gas pool heater. When I release
The thermocouple called a thermopile is bad its that silver coated two wire thing that runs to the pilot light area and needs replacing.
SOURCE: Millivolt pool heater will not ignite
Most heaters do not require power for the pilot to remain lit. Is there power at he unit? If it worked yesterday and not today has anyone turned it off at the circuit breaker? If you have power turn the gas valve off for 10 minuets and then relight to see if it needed a reset.
SOURCE: (natural gas) the heater comes on for 3-5 minutes
Check your high limit switch inside of the heater. Usually when the high limit switch pops it will take about 4 to 6 hours for it to reset itself without you resetting the system.
SOURCE: Teledyne Laars LD250 Propane Pool heater cycles on and back off
Do you replace the thermopile or check the milivolts?
Check the Pressure gas
You need replace all of them terminals and check again the milivolts at the gas valve
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