It isn't code to run 120V receptacles off of a 240V circuit. That's a recipe for a fire that your insurer will not cover. You can do a shared neutral to two 120V loads in limited circumstances.
It doesn’t surprise me that it’s not code but it’s common and I’ve never heard of an insurer doing anything at all to verify your electrical isn’t a total disaster.
Either way GPs point that the lack of 240 stopped / stops US washers from having water heaters is unfounded. There’s almost always a cable with 240 not two feet away.
Another thing I didn’t think about is that a lot of people (not me) have sinks in their laundry rooms, so there’s also cold and hot run there anyway. I wonder if some Europeans aren’t running hot to all their sinks.
edit: I’m not sure it is against code? When I google it it seems to be fairly common advice and allowed under NEC.
Actually I thought of a case where this is just not just common but practically universal: welll pumps. Basically all the pumps are 240, and a 120 receptacle or light is almost always installed off the same (240) circuit.
There are 120VAC units in the U.S., but there are also 240VAC units in the U.S. You just have to get the right unit for your available power, or have the appropriate power run for your unit.
