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I checked Home Depot today and, oddly, all the Rheem 240V models are selling for less than the 120V models of the same capacity, even before rebates.
If I do get a 240V model, I certainly would just disable the resistance heating mode, which all the Rheem models (and probably all models, period) have the option to do.
SpaceX has to do the disabling, so they are on board. I like to imagine that this was one of the conditions for the multi-billion dollar purchase of Starshield, along with exclusive use and SpaceX not being allowed to disable it anywhere for any reason.