I got my new gas light.

jaycocreek wrote:
OMG...Now 12 more pages on the correct meaning of forced air..I explained it correctly but labeled it wrong,evidently..(laffin)

First, you make a untrue statement " the forced air furnace without a blower.."

When questioned your definition, you trumped down on it with

"They used to have just a furnace without a blower that forced air out, kinda like a catalytic heater,that had no blower or electricity involved..The thermostat was numbers on the dial..LOL..When the number on the dial reached it's temperature,it went to just the pilot until it needed more heat.."

A furnace, gravity or forced air, does not resemble a catalytic heater. Furnace will always have a path for the waste gasses of combustion to the outside, not into the room with the heated air. The most efficient will bring air needed for combustion from outside.
Where a gravity furnace could work in a RV, not use electricity it would burn more propane, unless it was below floor level. A wall mounted unit would put heat high in the room, to pool at ceiling. With nothing to circulate it would take a lot of heat to get that pool down to knees. The fan blower reverses the natural flow in the furnace, so the natural flow in the room helps to heat it.