I did that exact thing in my barn. I have a blue-flame heater in my barn, hooked up to a portable propane tank.
You'll need a dual stage regulator; available at most hardware stores. Then get a few various hose connections to get from the regulator to the heater.
Something like this ... (my local hardware source website)
this one does not have tank connector: https://www.menards.com/main/heating-coo...9147&ipos=3
This one has tank connector: https://www.menards.com/main/heating-coo...9147&ipos=1
don't worry about the BTU ratings; it's OK to be oversized. I have a 30,000 BTU gas heater and use the 160,000 regualtor assy. Works fine.
here is another example from HomeDepot: https://www.homedepot.com/p/Worthington-2-Stage-Regulator-331891/203263169
You get the idea ....
Just make sure you get a "dual stage" and not a "dual tank" set up. The desired one is made to control from tank pressure to the low stage of the gas appliance. The other (duel tank) is made for RVs which have two tanks, which I presume you'll not need, unless you want that set up specifically ....)
You asked about "everything", but I cannot tell you exactly what you'd need as I don't know what all you have currently. But here's a guess:
- dual stage regulator with propane tank connector (get one with the connector already included - makes life easier)
- hose(s) to get from regulator to heater (I recommend at least 4' of hose to keep the tank away from the heater)
- some pipe nipples which include getting from the hose to the heater inlet (sized to match whatever hose you buy)
Make sure you "fit match" the combo in the store; open the packages and double check your thread connections, male/female, etc. Nothing sucks more than getting home and realizing that you forgot something, or got the "wrong" threads. Also, MAKE SURE you know the inlet size at the heater itself. It is likely 3/8" NPT and NOT 1/2"; that is a common mistake folks make. Most household appliances use 1/2" NPT inlet (gas dryers, gas stoves, etc). But these blue-flame wall heaters often use a smaller inlet, SO CHECK PRIOR TO HEADING TO THE STORE, OR BUY A FEW DIFFERENT FITTINGS WITH A BELL-REDUCER JUST IN CASE.
Once you get it right, you'll be thrilled!