This does NOT apply to smaller units like a 40gal under the house kind. It applies to larger models.
Oh, and the oh so techie dysfunctional HEAT pump on the unit— yeah that will save power. What a laugh.
A heat pump water heater would save money, but I’m sure it would probably cost 3-4 times what a standard electric water heater does. Last time I checked, I think they were around a thousand dollars. I imagine the recovery rate would probably be lower too, so you might need a bigger tank.