advantages of a drop header

Jim_83

On a steam boiler, what is the advantage of using a drop header instead of a normal header? Will my oil dealer or plumbing and heating contractors know what a drop header is if I ask for it on my new boiler?

I don’t want to be hearing from a contractor that they never heard of a drop header or it’s not needed.

I don't see the drop headers in the boiler manufacturers near piping diagrams. Will the drop headers void the warrantee of the boiler?

The boiler will be a Burnham IN4 if I use gas or a Burnham IN3 if I use fuel oil.

Which fuel is the better one to use, natural gas or #2 heating oil? I have oil now and am considering converting to gas because of a Keyspan incentive plan.