That’s what mine was. No water. Just a gas blower into this huge structure with all the ducking. Cold air returns would bring down the cold air and the hot air would circulate up. There was also a spot for you to add water that would get converted to steam to add moisture in the air. These systems were extremely dry.
That’s a new one on me. You meant ‘gas burner’, right, no blower involved?
Yes gas burner. Not a blower.
And to bring this back to a car-related topic, a lot of antique cars (like the Model T) had ‘gravity cooling’ for the engine, no water pump:
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Same, had one big register with the heat dome, between living room and dining room, cold air return in living room. Upstairs had registers in the floor through the ceiling to downstair rooms.
Read of owners back then using oatmeal as stop leak in those systems!
Yeah, very simple, a plain-old coil-spring thermostat gadget has a switch that turns the current from the thermocouple on and off.
Funny high-tech story… Years ago I was required to attend a manufacturing engineer’s project design review. He had to control the temperature of an enclosed space to 75 deg F +/- 5 deg. For testing an electronic gadget. Very complicated computer design, thousands of dollars in hardware, he said it would take 5 months just to debug. Another engineer in the meeting said "why not use a standard wall thermostat? … lol …
I kno that, which do you think are more relevant?