How much RAM can my computer handle?

I have a iMac that was manufactured mid 2011 21.5 inch display.  The specs say it can only handle 16GB of RAM but here's the response I got from the RAM manufacturer:
"Whist your official manufacturer specification recommends 16GB maximum capacity, we can confirm that your iMac can support up to 32GB because this has been rigorously tested in this system and is guaranteed compatible.
But I can set up a refund for you, if you would still like to purchase other memory modules."
Here is my response:
"Can you guarantee in writing that 32GB of RAM will work for my machine and not hurt it? If it breaks because of too much RAM do you replace the computer?"
Please advise 16GB or 32GB.  By the way, I gave the manufacturer the serial number of my iMac so they shouldn't gotten this wrong.

Get your hands on the ever-useful app, Mactracker. It lists all the specs for one's Mac including the latest capacity for RAM.
You can get it here or at the Mac App store (and iOS store)
http://www.mactracker.ca/index.html
For your model;

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