Medical devices for applying energy to tissue in prostate, bladder and/or kidney related treatments, namely, probes and catheters that deliver thermal energy; energy control systems used for applying energy to tissue in prostate, bladder and/or kidney related treatments comprised of an energy supply and an electronic control unit for controlling the energy supply; and fluid supply units for use with the probes, catheters and energy control systems to generate a thermal vapor for applying energy to tissue in prostate, bladder and/or kidney related treatments