Dear R. Lebowitz,
Regarding your shiur "Barbecue on Yom Tov", you mentioned a possible heter for turning off a gas stove on Yom Tov (possibly attributed to R. Moshe Feinstein, though unpublished), and speculated on the basis for the heter. What I didn't hear you mention was the concept of the pilot light. Until the 1990s or so, most gas stoves used a pilot light. This was a small flame inside or under the stove, that stayed lit all the time. When you turn on the gas to one of the burners, that opens up a valve to take gas through a pipe past the pilot light, and the ignited gas goes to the burner. When you turn off the stove, that connection between the pilot light and the burner is cut off, but the pilot stays lit. So when you turn off a stove with a pilot light, effectively you are just reducing the flame, not extinguishing it.
Because pilot lights waste a lot of gas, and in some cases can cause a danger if the pilot light goes out, there was a change in how stoves are made, so modern stoves use an electric spark to ignite the gas each time you turn on the stove. So unless you have an old stove that uses a pilot light, the metzius is different from how it was in Reb Moshe's day, and his heter may not apply at all.
I have a friend whose old pilot-light stove broke. She had a psak from her rav that she could turn off the stove on Yom Tov for exactly the reasons outlined above, but that she couldn't turn off a stove that didn't have a pilot light. So she found a used appliance dealer who had an older model of stove (no longer made) that still used a pilot light, so she bought that stove davka so she could more easily cook on Yom Tov.
Regards,
Jonathan Traum
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Author: Jonathan Traum
Teacher Reply Jonathan Traum,