Turn on the propane, make sure it's feeding your appliances without a lot of air. Easiest way is to check your stove, good blue flame preferred (orange = air). Turn on your water heater with the outside door open. Go out and watch if you have good flame in the tube. Should light with spark from the igniter (little control module, you'll see red igniter wire going to burner). It will try at least three times. If not, the gas tube feeding the burner (tube between the gas valve and main burner tube) commonly gets clogged up (spider web, bugs, rust, etc). With the age of your unit, you could have a gas only heater. Do you have two switches inside? One for gas, one for electric? If you have electric you'll see Romex wire running to the back of your water heater, a plastic junction box where a relay and the electric heating element can be found. You may also have a small black switch outside on the water heater, lower left, near the gas valve, that controls the electric. Hope this helps a little.
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