Quote:
Originally Posted by glatt
Do modern ones only open the gas valves when certain ignition temperatures are confirmed?
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Even all 1950 furnaces and water heaters had a thermocouple that would not permit gas flow if the pilot light did not heat that thermocouple.
Starting a pilot light meant holding a button for maybe 30 seconds while lighting the pilot. So that the thermocouple got hot enough to not cut off gas. That was standard even in 1950.
Part that failed most often was that thermocouple.
Appliances, since the 1980s, no longer use a pilot flame. If electricity does not ignite gas, then gas is cut off.