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Old 06-01-2011, 09:46 PM   #16
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


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Originally Posted by Speedy Petey View Post
I wouldn't. Depending on the conditions this may be a code violation, in any case it is a bad idea.
Why is it a bad idea?

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Originally Posted by Speedy Petey View Post
Are you saying it is just one GFI receptacle, in the one bathroom, on the 20A circuit?
Sorry, my bad, it's actually 2 gfi outlets on a 20A circuit...

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Old 06-01-2011, 10:05 PM   #17
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


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Originally Posted by paisley13460 View Post
Why is it a bad idea?

Sorry, my bad, it's actually 2 gfi outlets on a 20A circuit...
You would not have any capability to run a blow dryer with the heat on. Also bathroom receptacle circuit either can serve receptacles only in multiple bathrooms or only one bathroom and can share lighting and fans.
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Old 06-01-2011, 10:21 PM   #18
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


The Operating Instructions only stated to "Use only 20 ampere branch circuit."

It didn't state that it has to be on a dedicated 20-amp circuit.
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Old 06-01-2011, 10:28 PM   #19
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


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Originally Posted by paisley13460 View Post
The Operating Instructions only stated to "Use only 20 ampere branch circuit."

It didn't state that it has to be on a dedicated 20-amp circuit.
Lets try to simplify this. If you have a 15 amp circuit and you try to run a blow dryer that pulls 12.5 amps and the fan/heater that draws 12.5 amps, how many amps is that? Do you think a 15 amp breaker will run both together?

Hint 12.5 + 12.5 = 25, 25>15 NO
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Old 06-01-2011, 10:52 PM   #20
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


Jim Port,

Isn't it your recommendation that I follow the manufacturer's instructions?

This is how it is shown in the manufacturer's instructions

"Use only on 20-ampere branch circuit." (It didn't say dedicated.)

I know you showed me the math.

But still, adding the unit to an existing 20-amp is still following manufacturer's instructions, isn't it?
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Old 06-01-2011, 11:03 PM   #21
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


You also need to follow the NEC restrictions on whether or not the Code allows that circuit to serve other loads.

Bathroom circuits can either serve multiple bathroom receptacles OR only one bathroom and it can be shared with lighting and receptacles.

Yes, you should follow the instructions and the NEC.
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Old 06-01-2011, 11:07 PM   #22
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


To Jim Port,

Is there anything in the NEC that requires a bathroom fan/heater unit to be connected to a dedicated 20-amp circuit?
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Old 06-02-2011, 12:55 AM   #23
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


Bonjour Paisley.,

I will tell you something real quick here myself and few other guys in here are electrician and we have to follow the manufacter instruction and belive or not many time when we pull the permits for it the inspector will look for the info on the bathroom heater/fan unit and they will look at the circuit capaity as well.

I have work on both Américiane and European bathroom heater/ light unit for a quite a while I know the codes are little diffrent at each country however no matter what langune you speak we still have to follow the manufacter instruction.

I know the USA verison will say use 20 amp circuit it very easy to do this due the reason why is the heater itself will typically draw about 1500 watts that about 12˝ amps plus the bulb wattage { typically 75 or 100 watts unless speced by that unit } and with NEC code the heaters we treat them as contuonous load so that why the manufacter say to use 20 amp rated circuit.

And for our European verison most of them will ask to use on 16 or 20 amp circuit with RCD { GFCI } { we run at 240 volts as well }

BTW., I have see couple bathroom heater/light units did manged to trip the breaker when someone ran the bathroom heater plus hairdryer on the same time.

Merci,
Marc
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Old 06-02-2011, 05:41 AM   #24
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


Ther NEC allows that a 20 amps circuit to feed the bathroom outlets and fan and lights, providing that the fan and light amperage do not exceed 50% of the circuit. This circuit can not feed any other rooms.
Whether it is a 15 or 20 amp circuit it would have to dedicated just for fan/heat/light combo.
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Old 06-03-2011, 01:43 PM   #25
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Bathroom Fan/Heater on a 15-amp Circuit Breaker


Thinking out loud,

Currently, the vent fan that we have in our master bathroom is connected to 15-amp circuit breaker as well as all the gfi outlets & lighting.

In the winter I use a portable heater that I attached to the outlet. Heater has 1500 watts.

So, plugging a portable heater to an outlet connected to a 15-amp circuit breaker is ok...

...but changing the vent fan to a combo vent fan/heater (that only has 1425 watts) is required to be connected to a 20-amp circuit?

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