We are sometimes asked about ceiling radiant, although we have replaced several ceiling radiant houses with either baseboards or floor radiant we have never installed a ceiling radiant system. We have installed a few wall radiant systems usually to supplement a floor panel. We have used wall radiant very successfully in barns to heat livestock.

      Radiant ceiling heat can never approach the comfort level or efficiency of floor radiant. You should never try to use ceiling radiant in a vaulted ceiling as the surface temperatures would have to be so high that the losses through the roof would be greatly increased.
     The human body has the poorest circulation in it's feet, it makes no sense to give it the least heat.