+1 on the 100# tank. When I get mine refilled where I go I always make sure I get the one guy thete who trily understands how the tank can/should be filled. When he fills, I can run my forge 6-8 hrs a day at forge weld tempsbfor a month or better. When the ither guys there fill my tank…2, maybe 2.5 weeks.
For those that DO NOT know about filling ANY “tank” with a compressible/condensible substance (propane is condensed…meaning, under pressire it turns from gas to liquid, vs 99% it is compressed, but can be pushed further to condense): the best way to fill the tank is with said tank in a bucket of ice/water. Adding pressure without increasing volume creates heat. The cooler the recpticle the more can go in, in other words. But a word of caution, depending on the size (volume) of the tank there is a “safe limit”. For a grill bottle…75%. So a 20# grill bottle should only be filled with 15 ACTUAL #'s of liquid. This allows for room for the liquid to expand without stressing the welds on the tank. A stressed weld could lead to an explosive cylinder…firey explosion if near a heat source.
Again, for those of you who DO know this, I do not mean to treat you as though you do not. Physics PhD’s, experienced smiths, and divers aside, you would be surprised at how few people lnow this. I would have forgotten it, even after Combat Diver training, if I ahad not become a commercial diver years later.
Back to the OP. I only +1’d the 100#'r bbecause of ease of transport. I had considered getting a 2nd (that way 1 is always charged) except that my disability (and this new CDC/DEA bull£#!+ messing with the only thing keeping me on my feet) if I can qyickly retro a log splitter into a press, I can keep going, but will need to up my tank to a size that warrants delivery. So if, in your area, you have good rates on delivery…then go as big as you can afford. In the long run, the more you get the less it costs.