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Unread 10-16-2020, 08:35 AM   #30
ss3964spd
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Location: Fairfax, Va
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Yup, you'll need, and want that dedicated circuit for the floor. If anything goes wrong with the floor you don't want it taking out lighting or the shower valve.

You can use either the lighting or receptacle circuits to run the valve, it doesn't draw much, but it does have to be on a GFCI protected receptacle or circuit. My shower valve is run off the dedicate 15A circuit for the 4 bedroom ceiling fans.

When I did my MRB I already had one spare circuit in the attic that I ran years ago for when I got around to doing the MBR, but at that time I hadn't considered the heated floor. So I did pull two more for the bath; also from the basement to the 2nd floor. Approximately zero fun, that job, but worth it.
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