Two Black Source Wires to Water Heater?

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Old 11-18-12, 08:17 PM
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Two Black Source Wires to Water Heater?

Hello All,
I am replacing an electric water heater, and when I went to connect the wiring, I found two black and one green source wires (no white or red wires). The new water heater has one black, one red, and a green screw. From reading online it looks like there should be one black, one white and one greed source wire. But, when I read about 240 volt power, it sounds like it has two hot wires that are 120 volt each and they swing back and fourth from positive to negative, which indicates to me that it might not matter which black source wire I connect the red water heater wire to. So, that is my question, does it matter which hot source wire I connect the red water heater wire to? And, if it does matter, how can I find out which wire I need to connect the red one to?
Any help would be appreciated.
Thanks
 
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Old 11-18-12, 09:08 PM
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But, when I read about 240 volt power, it sounds like it has two hot wires that are 120 volt each
No your house is supplied with 240 volts plus a grounded center tap off the supply transformer secondary which is used with one of the two 240v lines to your house to make 120 volts. While red and black or often used for 240 volt supply there is nothing wrong with two black wires. It doesn't matter which of the black wires the red on the WH goes to. No white is needed because the water heater is 240 volts only.

Here is the electric supply to your house:
 
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