Combobulus

I'm building a forge, and have already bought a single burner. I'm planning on using the core of a large hot water heater. The diameter is roughly 43cm wide (without the insulation.) With insulation it'll be around 30cm. I'll probably make it around 30cm long as well (I have well over a meter of length available). Is this too much for a single burner to handle? Burner is the basic Devil's Forge DFP burner. I was also wondering whether or not something like 2 layers of 2" insulation is too much for a forge, haven't seen or heard anyone mention it anywhere. Cheers