All (about 175) of the Cardiovascular Disease fellowships, except maybe a half-dozen, are University or University-affiliated programs. So whether you're interested in research or not, the Cards guys are. Take-home point is that theres really no such thing as a non-academic cards program.
So research is almost nessecary.
Don't worry too much at this point. You might find that Cardiology is too research-oriented for your liking, and decide that you want to do something else. I mean, what you're saying (in fewer words) is: "I'm interested in being a cardiologist, but Im not interested in cardiology". Give yourself time to find something that you are interested in being and doing as well. There are plenty of specialties which are clinically focused.
Or you might decide that you actually like research.