240 Volt Heater on a 220 Volt Drop


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Old 11-10-07, 07:47 PM
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Exclamation 240 Volt Heater on a 220 Volt Drop

I recently built a new home and asked the builder to run 2 240 Volt runs for some portable heaters in an effort to save on heating bills. After moving in I learned that they ran 2 220 Volt runs with a 20 Amp circuit breaker for each.

So now I have these two 240 volt heaters and I'm scared to plug them in. The manual for the heaters reads as follows:

Volts AC Watts AMPS
60 HZ Hi LO HI LO
240 4000 2660 16.7 11.1
220 3360 2240 15.3 10.2
208 3000 2000 14.4 9.6

Will these work on the 220s they installed? The wall recepticle fits the heater plug (NEMA 6-20R if this has any significance).The builder's construction manager says yes this should work but based on my history with them, I doubt their credibility. I think they are trying to cover their mistake......
 
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Old 11-10-07, 08:01 PM
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Your heaters are rated for 240, 220, and 208 Volts so there is no reason they can't use it.

However, if you want it to get 4000 Watts power out of them, you won't, like they would if you had 240 Volts. You'll get 3360 Watts on High.

At 220 Volts they draw 15.3 Amperes of current on High and 10.2 Amperes of current on Low. Your breakers are rated 20 Amperes. You never want to go more than 80% of the breaker rating, and 80% of 20 is 16 Amperes.

Everything should be fine

p.s. Where do you live?
 
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Old 11-10-07, 08:23 PM
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Originally Posted by flightpilot View Post
I recently built a new home and asked the builder to run 2 240 Volt runs for some portable heaters in an effort to save on heating bills. After moving in I learned that they ran 2 220 Volt runs with a 20 Amp circuit breaker for each.
No, you have two 240v circuits.

If you live in North America there is a 99.999% chance you have a nominal 120/240v service. MANY areas are even above that. I am just under 125/250v at my house.

"220 volts" is a misnomer and a thing of the past. Nothing is a real "220v" any more.

DON'T sweat it.
 
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Old 11-10-07, 08:31 PM
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Originally Posted by Speedy Petey View Post
If you live in North America there is a 99.999% chance you have a nominal 120/240v service.
Yeah, that's why I was wondering where he lived
 
 

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