A twisted thermal metadevice is introduced and experimentally validated, demonstrating the concept of "twisted thermotics" for heat diffusion. This concept is inspired by the magic angle phenomenon in twistronics and opto-twistronics, where twisting a system can lead to a switch from thermal cloaking to concentration. The study shows that by carefully tailoring thermal coupling, a twisted diffusion system can achieve a thermal magic angle, enabling tunable heat diffusion control. The research introduces a twisted stripe bilayer system, where the effective thermal conductivity tensor is derived as a function of the twisting angle. The thermal magic angle is determined by the stripe width and radius, leading to an inflection point in thermal conductivity. Numerical and experimental results demonstrate that twisting the system can switch the thermal effect from cloaking to concentration, and also enable thermal rotation and the Janus effect. The study provides a theoretical framework for twisted thermotics, opening new avenues for thermal management and applications in twistronics. The results show that the thermal magic angle can be robust under various conditions, and the system offers a flexible and tunable approach for controlling heat diffusion. The work highlights the potential of twisted thermotics for future thermal manipulation and applications in fields such as fluids and particles.A twisted thermal metadevice is introduced and experimentally validated, demonstrating the concept of "twisted thermotics" for heat diffusion. This concept is inspired by the magic angle phenomenon in twistronics and opto-twistronics, where twisting a system can lead to a switch from thermal cloaking to concentration. The study shows that by carefully tailoring thermal coupling, a twisted diffusion system can achieve a thermal magic angle, enabling tunable heat diffusion control. The research introduces a twisted stripe bilayer system, where the effective thermal conductivity tensor is derived as a function of the twisting angle. The thermal magic angle is determined by the stripe width and radius, leading to an inflection point in thermal conductivity. Numerical and experimental results demonstrate that twisting the system can switch the thermal effect from cloaking to concentration, and also enable thermal rotation and the Janus effect. The study provides a theoretical framework for twisted thermotics, opening new avenues for thermal management and applications in twistronics. The results show that the thermal magic angle can be robust under various conditions, and the system offers a flexible and tunable approach for controlling heat diffusion. The work highlights the potential of twisted thermotics for future thermal manipulation and applications in fields such as fluids and particles.