I'm looking at buying this Lenovo desktop. However, a colleague of mine is concerned that because it's relatively slim (3.9" x 13.2" x 15"), it will output more heat. We don't really care about the temperature inside the case, but because we plan to use it in a controlled lab environment, it's important that it doesn't generate significantly more heat than a standard desktop.
I haven't found any evidence supporting my colleague's claim on Google. Is he correct?