Other than light, there is not a large radiant component to a gas flame; that is, the gas flame itself will not send much heat to the metal parts. The fire is mostly decorative until the hot gases hit the metal parts of the heatilator to send heated air out to the room. The logs that are covered by the hot gases can send some heat to the parts. The pilot must be in the flame to sense it and it must be near enough to the gas fire to light it. It is most likely that the ignition system came with the logs as part of the design of the fire. To feel more secure, find the papers and look at them to see where the parts should be located. If you do not have the papers, look for a tag that tells you the name of the manufacturer and ask them for a copy.