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Open up the outside inspection cover over the water heater and give me the make and model off the data tag and I can get you the proper manual and direct you further. All follow ups are included in our fee.
So that has no AC element so it is a LP gas only unit. There should be a switch on the wall with a red light OR one on the range hood that says "Heater" or something similar. That is the ignition switch and once you turn it on, the red light should come on until there is ignition and then it goes off. If the switch is on the range hood or control panel it won't have a light. If you don't find it let me know.
Thanks for letting me know........