[Avodah] Can one add water to a hot water urn on yom tov if this might cause the indicator light to turn on?

[Akiva Miller via Avodah]

WADR, I question the metzius of the two-heater system described by Rav
Belsky. Is the smaller heater really on constantly? There's no thermostat?
And if there *IS* a thermostat (which there must be, because without one,
the water would either boil away or never get hot) then why bother with two
separate heating elements?

And if he is correct, is it true of ALL urns?

Akiva Miller
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