Most likely the outlet is fed from a switch. If so, it cannot supply
constant power without replacing the cable between the switch and the outlet
with a 3 wire + ground cable.
If the outlet is powered and then controlled by a switch, you will have to
do more than just break off the brass tab. If you don't know how, I suggest
finding a good book that shows a number of wiring diagrams as it is just too
complicated to describe in words alone.
Odds are there is a white and black wire between the switch and the outlet.
Since the black is switched, there is no way to power the heater all the
You must either add a second cable, or replace the existing cable with a
cable that has red, black, and white.
Either way, you then split the outlet. Splitting it without adding the new
cable will just stop it from working at all.
One additional item to add to the already accurate information that you've
received thus far. These units are usually at least 700 watts. You need to
be sure the feed you want to connect it to has the capacity to power this
device in addition to anything else already connected to it
i personally pre wire for a insty heat with the sw off plug the
disposal into the other opening if it turns on then thereis nothing to
do but plug in the heater.
other than that id just be repeating advice alredy given to you.. good
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