Hot water heating instructions

If yours is older and gas only, chances are it runs off a pilot light, like a gas oven. You set a fire starter under the place where the fire lights, and then you push a knob that says pilot. Once the Pilot lights, you continue holding the knob in for a few seconds to a couple minutes (depending). If you can let go of the push knob the, and the flame stays on, then you set the knob to the "on" position. The burner will start and turn off when up to temperature, but the pilot light will continue to burn. On windy days, it's not uncommon for the pilot light to blow out.

If your's is more contemporary, then there should be a switch inside the camper that turns on the electric "spark" that ignites the flame.