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From your description it seems the white wire is a neutral and may be required for the controls. Typically the black and red wires provide 240v power to the heater. I've never seen a water heater with a 4th wire but ranges very often have a neutral because accessories such as lights and the timer run only on 120v.

It may also be that you can connect the water heater to more than one voltage. I wouldn't know without looking at it or the paperwork. You need a competent electrician to look at it for you.

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