20AMP Breaker to 15AMP GFCI Wiring

[lankygolfer]

Currently I have a 20AMP breaker with 12 gauge wire going to a 15AMP GFCI receptacle in a bathroom. The receptacle is the only item on this circuit. I'm adding a 120v heated floor to the bathroom w/ thermostat. The specs call form only a 15AMP breaker. I plan on bringing the power to the thermostat from the existing GFCI outlet. The floor will pull only 100-125 watts so I should be fine there. My question is... do I use 12 gauge wire to make that connection from the existing GFCI to the thermostat, or can I use 14 gauge? TIA

 

[Megawatt]

Currently I have a 20AMP breaker with 12 gauge wire going to a 15AMP GFCI receptacle in a bathroom. The receptacle is the only item on this circuit. I'm adding a 120v heated floor to the bathroom w/ thermostat. The specs call form only a 15AMP breaker. I plan on bringing the power to the thermostat from the existing GFCI outlet. The floor will pull only 100-125 watts so I should be fine there. My question is... do I use 12 gauge wire to make that connection from the existing GFCI to the thermostat, or can I use 14 gauge? TIA

If it was me I would use # 12 wire since it’s on a 20 amp breaker. If you come off the load side of the GFCI receptacle and it being a 15 amp, then you can use # 14 wire. I’m just saying that I would use # 12 wire.