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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The white wire is typically used as a neutral wire. In an RV installation, the white wire can be connected to the green wire to the ground or chassis of the RV, as RV electrical systems may not have a traditional neutral wire. It's always recommended to consult the installation manual or a professional electrician for guidance on connecting the wires safely and correctly.
The white wire goes to the silver screw terminal (neutral), the black wire goes to the brass screw terminal (hot), and the green or bare wire goes to the green screw terminal or grounding clip (ground). Make sure to follow the manufacturer's instructions and adhere to electrical safety practices when installing the outlet.
there are plenty! (megan fox shows up btw. she has blue/green eyes with black hair)
A black rock that turns green later is likely serpentine, a green mineral that may weather from black-colored rocks like basalt or peridotite. This color change occurs due to the alteration of minerals in the rock, resulting in the development of green-colored minerals like serpentine.
Copper(II) nitrate will turn from green to black when heated due to the decomposition of the compound. The green color is due to the presence of copper ions, which decompose into copper oxide when heated, resulting in the color change to black.
The silver ferns are predominantly silver or grey in color on the underside of their fronds, while the upper surface is typically green.