Can I install wide-plank solid hardwood over radiant floor heat?
There are lots of resources covering this topic, and since your question is rather broad I'm inclined to refer mostly to them. In general, you can install hardwood over floor heat if:


Subfloor temperatures are reasonable (say within 15 degrees of room air temperature)
You stick to quartersawn wood species that are known to handle heat well, or
You go with an engineered floor


More on that