Blichmann 20g with 5 gallon batches

I just received my new 20 Gallon boilermaker. Can't wait to try it out this weekend with my first all grain batch.

I bought the 20 gallon size because I wanted room to move up to a 10 gallon all grain batch sometime soon. I figured I could still do 5 gallon as well. However, I'm a little concerned about the size of this kettle and just filling it a 1/4 on the start of a boil.

Should I make any changes to my batch to compensate? Any tips on using such a large kettle with only a 5 gallon batch?

You should be filling it to more than 5 gallons for a 5 gallon batch. I usually have about 8 gallons in my kettle to start a 5 g batch.

One problem is that you won't be able to use the thermometer. On a 20G Blichmann, it's over the 8G mark. You could always plug the original hole and relocate the thermo lower.