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Hi my name is ***** ***** I have been in the plumbing field for 20 years. i will be glad to help you today. The hot wires should be white, black and green right?
The wires on the water heater should be red, black and green. Red connects to white, black to black and green to the ground screw.
Since it is wired to be two 110v feeds, one for each element if they ran a 2 wire for each then you would have two black, two white and two ground. In that case you would connect the white wires together and black to black, black to red and green to ground screw. To save wire they would use just one 2 wire and use the neutral for the other hot feed.
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