A thermostatic mixing valve comprising a valve housing with a hot fluid inlet, a cold fluid inlet, a fluid mixing chamber for receiving fluid from the hot and the cold fluid inlet, and a fluid outlet in fluid communication with the fluid mixing chamber, a spring-biased flow control assembly for controlling flow of fluid to the fluid mixing chamber, a spring, and a thermostat device for operating the flow control assembly, the flow control assembly being arranged to be biased by the spring, wherein the flow control assembly is adapted to be moved by the thermostat device in response to a temperature of the fluid in the mixing chamber such as to close and open a respective fluid communication of the cold fluid inlet and hot fluid inlet with the fluid mixing chamber such as to maintain said temperature at, or at least close to, a preset temperature, characterized in that the spring is arranged between the flow control assembly and a cup-shaped portion of said valve housing, said fluid communication of the cold fluid inlet with the fluid mixing chamber occurring around said cup-shaped portion, and the thermostatic mixing valve comprises a cold fluid bypass opening being an opening in said cup-shaped portion, a bypass closure member movable between a closed position in which said cold fluid bypass opening is closed by the bypass closure member and an open position in which the cold fluid bypass opening is open and allows a bypass flow of cold fluid to the mixing chamber through said cold fluid bypass opening, and a holding device arranged to apply a holding force to the bypass closure member to hold the bypass closure member in the closed position, wherein the bypass closure member is arranged to be moved from the closed position to the open position when a pressure force exerted to a pressure surface of the bypass closure member (37, 43) by cold fluid in the cold fluid inlet exceeds said holding force. a valve housing with a hot fluid inlet, a cold fluid inlet, a fluid mixing chamber for receiving fluid from the hot and the cold fluid inlet, and a fluid outlet in fluid communication with the fluid mixing chamber, a spring-biased flow control assembly for controlling flow of fluid to the fluid mixing chamber, a spring, and a thermostat device for operating the flow control assembly, the flow control assembly being arranged to be biased by the spring, wherein the flow control assembly is adapted to be moved by the thermostat device in response to a temperature of the fluid in the mixing chamber such as to close and open a respective fluid communication of the cold fluid inlet and hot fluid inlet with the fluid mixing chamber such as to maintain said temperature at, or at least close to, a preset temperature, characterized in that the spring is arranged between the flow control assembly and a cup-shaped portion of said valve housing, said fluid communication of the cold fluid inlet with the fluid mixing chamber occurring around said cup-shaped portion, and the thermostatic mixing valve comprises a cold fluid bypass opening being an opening in said cup-shaped portion, a bypass closure member movable between a closed position in which said cold fluid bypass opening is closed by the bypass closure member and an open position in which the cold fluid bypass opening is open and allows a bypass flow of cold fluid to the mixing chamber through said cold fluid bypass opening, and a holding device arranged to apply a holding force to the bypass closure member to hold the bypass closure member in the closed position, wherein the bypass closure member is arranged to be moved from the closed position to the open position when a pressure force exerted to a pressure surface of the bypass closure member (37, 43) by cold fluid in the cold fluid inlet exceeds said holding force.