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Yes, you can add extra circuit to it to control the electric water heater through an ignition switch, but first, is that EWH original equipped with car or someone add it on latter?

If it's original equipped, then you should find out what causes the battery drains and fix the problem rather than try to add some circuit to it.

If it was add on latter, perhaps you or have someone knowledgeable about electrical trace the wiring and should be able to figure it out.
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