April 29, 20233 yr Just finished up a Diesel forge. Internally it is 450mm (17.7") by 250mm (9.8") and 180mm (7") in height. 2" superwool xtra as insulation and about 1/2" of refractory on top, the floor is made of a layer of k-26 IFB with a layer of hard firebrick on top inside the forge so the floor can be replaced easily. We used the burner from an old residential water heater. Compared to our big propane forge with about the same internal volume it seems to get hotter whilst being cheaper. Gas has gotten pretty expensive here. The Diesel forge runs at about 2 - 2.5l/hr with the prices here thats about 20% cheaper than the propane forge that runs on 2kg/hr and it is quite a lot hotter at that, I measured it at 1360C (2480F) yesterday with the temperature still climbing. Running it on Diesel as opposed to waste oil might not be as cheap, but it burns very clean and doesnt really need preheating
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