Does it make sense to install cork flooring on a heated floor? After all, cork is a good heat insulator. Wouldn't this be a waste of energy?
If cork is not an option, what other option is there for underfloor heating other than tile? This is a kitchen in the basement.
Thanks in advance for your answers!

Cork will make a good floor surface over radiant heat. I would recommend a floating floor. Heat will eventually make the floor warm, even though it may take longer than tile. You just need to use a clock to set the time that your system starts to heat.
Cork is a lot better to walk on than tile, so there is no comparison for comfort..
Some radiant floors are kept at a certain temperature during the heating season so heat loss would only be noted at the edges of the floor as heat radiates outward, like into the concrete footings of walls that touch dirt.

thanks for the answer!
and where is it more profitable to buy equipment for heated floors and cork? amazon/com, globy/com, alibaba/com?