We're not discussing the simplest way of improving efficiency. We're
discussing the simplest method reheating a cylinder.

No we are not.

I qoute from your original.

"The simplest method to re-heat a cylinder. Have two cylinder stats, top
and
bottom of the cylinder either strap-on or immersed."

Your statement was that this method was the simplest method to re-heat a
cylinder. It is a method to heat the cylinder, it may even be a better
method in some circumstances, but it is NOT the simplest.

Christian.