Hi, sorry but I didn't clearly understand your needs, when you say to render a cad drawing in revit you mean to make some images of the 3d model? or actually you only have 2d drawings in cad and you need them created as 3D BIM files to be used in revit projects (as a component)?
In either way I would be more than glad to help you, my current bid is generic. If you can provide more info about your heater (like some screenshots of your cad drawings) and confirm if you need images or the revit file. I can create a better offer, delivery date and show you some examples.
Please feel free to ask any question you may have.
Best Regards