Zener Diode vs Voltage Divider vs DCDC Converter vs Voltage regulator IC
A Very Low drop of current.


Meaningless unless you mean has the ability to drive a good amount of current or does not take too much current in standby. Both important.


  Least heat dissipation


A DC-to-DC converter is your only option here. Specifically, you need to find a high efficiency buck regulator capable of supplying the current you need. All the other options will waste heat because that's what they do when they drop voltage from a higher voltage to a lower voltage.

When you have decided what current you need there are plenty of ways to find one.