208V IR Heater On 240V? - Electrical - DIY Chatroom Home Improvement Forum

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Old 07-31-2011, 12:01 PM   #1
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208V IR heater on 240V?

I'm moving my shop. At the old shop I have 208 3-phase with a 208V leg. AT the new shop, I have 240V 3-phase with a 240V leg.

I have two infrared heaters that have two elements each that share a common connection. I currently have each element connected to a single-phase 208V.

Will each element be OK on a 240V circuit?


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Old 07-31-2011, 12:10 PM   #2
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Check the voltage rating on a sticker or name plate anyway. It may well have been a 240 volt heater to begin with. Do not run a 208 volt only heater on 240 volts if it has moving parts such as a motor.

There is a small chance that the life span will be shortened just a little for a 208 volt heater run on 240 volts. It will be hotter on 240 volts compared with on 208 volts.

By the way you will get 208 volts if you connect something from the 120/240 volt delta 3 phase neutral to the wild leg, the latter often with wires marked in orange. Do not use 120 volt receptacles if you run a branch circuit using the wild leg and neutral.


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Last edited by AllanJ; 07-31-2011 at 12:20 PM.
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Old 07-31-2011, 02:32 PM   #3
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how true was the 208.... 213 216?? then the 240 will always be lower range 235 just the amps will change to less read compared to 208
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Old 07-31-2011, 05:28 PM   #4
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Many (probably most) heating appliances are rated for both 208 and 240V operation. Even if it's not, any 240V-rated heater can be run on 208 at reduced power. However, a 208V-only heater on 240V will run at 33% higher power and this could cause overheating. So, what does the rating plate on it say?
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Old 07-31-2011, 05:33 PM   #5
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This is a passive infrared heater with no moving parts, just two elements with two wires each.

I'll have to find my 12' ladder and look at the units when I remove them to see if they are rated for other than 208V.
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