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Yes but a 208 volt heater is intended to be delta connected so there are only three terminals. The three heating elements could be rewired to run in parallel off a 220 v single phase circuit, and the heater would then operate at 12% excessive power, which might shorten its life.

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No. The heater will operate over its given specified wattage. A 208 volt heater run off of 240 volt will have an output increase. Ohms law stated that current is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit. A 240 volt heater can be run off of 208 but the wattage will be reduced.

For example if the heater is 5000 watts at 208 volts, the current is I =W/E 5000/208 = 24 amps. The resistance of the heater is R = W/I (squared) =5000/24 x 24 (576) = 8.68 ohms. Applying 240 volts on the same heater whose resistance is 8.68 ohms results in this new heater wattage rating. W = E (squared)/R = 240 x 240 (57600)/8.68 = 6636 watts. This is 1636 watts higher than the manufacturer's safety rating.

W = watts, I = amperage, R= resistance in ohms and E = voltage.

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10y ago
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16y ago

You can connect a single phase 220V water heater to a 380/220V 3 phase supply. Simply connect it between one of the 3 hots and neutral. If the heater requres 110V this will not work, as this system doesn't have 110V. You will have to supply it off another panel in your shop.

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10y ago

You can. Any two legs of a three phase system is classed as single phase.

Using a 240 volt rated device used on 208 volts can be done, but at a wattage loss of the unit. For example using a 4000 watts hot water tank on 240 volts its amperage would be, Amps = W/V. 4000/240 = 16.6 amps. The resistance is calculated to be R = E (squared)/W, R = 240 x 240/4000 = 14.4 ohms. If the 240 volt device is connected to a 208 volt supply the following condition happens. Amps = Volts/Resistance in ohms, 208/14.4 = 14.4 amps. As you can see (and as ohms law states) as the voltage drops so does the amperage. To check the 208 voltage connection's wattage, W = A x V, 14.4 x 208 = 2995 watts. The 240 volt 4000 watt HWT will only produce 2995 watts which is 25% lower at 208 volts.

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11y ago

Yes, you can but the wattage output rating of the heater will not be reached due to the lower applied voltage. For example if the heater is 1000 watts at 240 volts, the current is I = W/E 1000/240 = 4.16 amps. The resistance of the heater is R = W/I (squared) = 1000/4.16 x 4.16 (17.3) = 57.8 ohms. Applying 208 volts on the same heater whose resistance is 57.8 ohms results in this new heater wattage rating. W = E (squared)/R = 208 x 208 (43264)/57.8 = 748 watts. W = watts, I = amperage, R = resistance in ohms and E = voltage.

So you can see if you have a 1000 watt 240 volt heater, at 208 volts you would only get 748 watts of heat.

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19y ago

yes, they are purley resistive. The wires would draw more current in order to put out the same amount of power. Dont hook it up off of 208 unless the manufacter says you can.

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14y ago

It is unlikely that the plug will match the outlet, if you do hook a 240 v heater to 120 volts, you will only get about 1/4 the amount of heat.

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12y ago

Yes, most equipment is rated 208-220-240 volts.

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12y ago

Yes, it will give you only 1/4 of of its rating

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11y ago

Yes, 220 is part of the nominal voltage range which covers a voltage range from 220 - 240 volts.

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14y ago

Yes but at a reduced wattage output.

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Q: Will a 208 volt 3 phase equipment work on 240 volt 3 phase?
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Can a standard 40 amp 208-240 volt single phase oven be wired to a 240 volt three phase circuit without using a transformer?

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