Just getting started with my first forge, a 2 burner Devil Forge.  I currently find myself using a single burner most of the time due to the size of the metal I am working.  How much of an impact does that have on forge temperature?  Should I make an insert to reduce the volume of the forge when using a single burner?  Does it matter?

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If the forge is getting your workpiece hot enough in a reasonable amount of time; then no problem.  If it's not  then reducing the size of the chamber may help.  What did the manufacturer say when you asked them?  (Remember if you decide to reduce the chamber size be sure to not put in a heat sink that will cool off the chamber as it absorbs heat!)

Thomas beat me to the answer, I was going to say the same thing.

I haven't heard back.  I'm just trying to not waste fuel by running both burners for small pieces.  I get orange verging on yellow, but I would like more working time.

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A movable inside wall, made from something at least semi-insulating, will solve work as you hoped, and help protect the burner that is shut down.

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