HI
I just purchased a Hypona gas forge. I made some burners, got some fire brick. The home made works well. But for the use, a lot of gas was used. I called on a place that sells all the ones you mentioned but he directed me to this, as one that burns 2/3 less gas. I told him he better be correct or it will be in the papers the next day. This forge was amazing for economy,great heat, great variability, but some limitations to size of material, try looking it up. Can't hurt.