Applications requiring long-range atmospheric propagation are driving the development of high-power thulium fiber lasers. We report on the performance of two different laser configurations for high-power tunable thulium fiber lasers: one is a single oscillator utilizing a volume Bragg grating for wavelength stabilization; the other is a master oscillator power amplifier system with the oscillator stabilized and made tunable by a diffraction grating. Each configuration provides $>150\mathrm{W}$ of average power, $>50\%$ slope efficiency, narrow output linewidth, and $>100\mathrm{nm}$ tunability in the wavelength range around $2\mathrm{\mu m}$ .