Can I connect my EU 230V 2.8kW appliance to a US 240V 20A receptacle?
blink blink I can't believe it.
We get so many variations of &quot;I got this European thing&quot; or &quot;can I plug (huge thing) into (tiny outlet)&quot; or &quot;renting as complication&quot; - and the answer is always a huge Nope.  Until now.
Yes, you can!
That receptacle is exactly what you need for that appliance.
In fact, if you had the ability to run a new circuit to that appliance, this is exactly what we'd tell you to install.
You might want to buy a lottery ticket :)  Luck is with you today. (or skill?)
Change the plug.
It just takes a common NEMA 6-20 plug that has a strain relief appropriate for that diameter of cable.  Any electrical supply house will have it, and a hardware store or box store might even.
The only way I'd consider an adapter cable is if you made it yourself with a TUV-rated Schuko inline socket, some 12/3 cordage, and the NEMA 6-20P of course.
Even if you could find an adapter, 99% chance it would be some cheap Chinese rubbish that would catch on fire and kill you with toxic smoke while you sleep.  I suppose, if you could find a high-current (at least 2.5mm wires) Schuko &quot;power strip&quot; from a reliable vendor of unquestionable quality (Tripp-Lite, Siemens etc.), then I'd say buy it and change the plug to NEMA 6-20P.