The E1020 timer is reliable heavy-duty 24-hour on-off analog timer with replaceable trippers and manual override, rated 12 amps.
This timer replaces ordinary single-pole on-off switch.
Timer has extra white wire that connects to white neutral wires inside box to run timer mechanism, while mechanical single-pole switch does not need this wire.
I don't know what it is doing... maybe running the vent fan periodically, or turning on attic vent fan?
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#E1020http://waterheatertimer.org/How-to-set-timers.htmlFor same timer, with less noise, install E1100-1200 aka the KM series in-wall analog timer. Or install digital in-wall timer, or replace timer with on-off switch.
If you need further help, I’m available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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