If there is any way you can vert. down , do it , you'll save yourself a lot of headaches. Thats what i've found out anyway! You can also try a tri-mix gas with 1 part hydrogen in it , (Liquid Air Blue Shield #10),if you try this gas you will need a different nut on your regulator to fit the tank valve, it has a thread on it like acetelene fittings. but your supplier will be able to outfit you properly.