Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: How is propane hooked up?  Do I have to have a big tank or can I use one the size that I use on y BBQ?
Document: I bought this fireplace back in April and had it installed. This thing puts out some serious heat! It will really warm up any room you put it in fast. The quality is top notch. There's a panel on the back that contains the valve for propane or natural gas. It seems to be set up for propane because mine was hooked up to natural gas and it wouldn't work until I found that valve under the panel on the back of the fireplace and set it to natural gas.
I went ahead and bought the optional blower and installed it in the fireplace and that may be overkill because it puts out so much heat. I always wanted a fireplace in my front room and now I have one!
So we have not been able to enjoy the fireplace as others have . It would have been nice if we could have fired it up before we left the store with it ,we live 70 miles from the store and the unit is very heavy so returning it was not an option , Hope the valve arrives in the next few days for this reason I would rate this two stars .
Flames are yellow but blue at base. Regarding real fire effect, the flames are not hidden behind a glass pane. So it's more realistic fire in this respect than even a real wood fireplace with glass in front. This is another advantage to vent free design compared to direct vent. I do not have a fan installed. Immediate heat results when fireplace starts up and my room can be heated quickly to comfort level.
This fireplace works great especially for supplemental heat and to fit into small areas. It was installed in corner of my upstairs living room. Thermostatic dial is used to set comfort level and the fire will come on/off to maintain set point. The cabinet is good quality however the company offers an even fancier version with remote which I would have bought but could not find online. No issues with operation or odors. Highly recommended unit.
Looks great and heats our room perfectly. Love how it doesn't take up a lot of space. It does include the corner conversion kit.
Answer: I would think there are two issues here.  First is how the line coming from the propane tank is hooked up to the back of the fireplace.  And second is whether or not there's a minimum PSI that's needed for the fireplace and the regulator to work.  If there's a minimum PSI needed then you may have to have a tank it's large enough to maintain that PSI.  So that may dictate how large of a tank you need and whether or not you can just simply use a barbecue tank.  My fireplace is hooked up to the same line that feeds my gas stove in the kitchen.