We used to have one of those Round IR Heaters from Costco! It worked well but was too awkward to store and bulky for use in the RV.
We gave it away and bought one of the Oil Filled Units which takes up just as much space but is easier to pack away when not needed.
We also have a couple of the small Ceramic units with fans to use when it is really cold!
Those Really Big Box style Heaters that use a special Light Bulb are just too big and overpriced in My opinion!