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I think its unlikely. Perhaps if you were imaging at 3 metres you'd notice it. Shorter focal lengths most likely not.
I use a little gas heater under my table at my dark site observatory as it can get quite cold at times and I have never noticed any effect in images even though the scope is not too far away over it at times. And that's a little portable gas heater. I'd say in my case what little heat does rise is quite dispersed by the time its near the scope lens as its abotu 1.5 metres or more. Also its only very occassionally the scope is directly over it, usually off to one side.
I wouldn't put a heater under a long focal length planetary imaging machine though.
I agree with Roger, unless you are a planetary imager I doubt you would pick it up. Seeing,exact focus, good collimation and accurate tracking are the key things.
Greg.
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