Cassette temperature limiter RTL is used for limiting the heating medium’s temperature in an underfloor heating system. Thanks to the temperature limiter the heating medium temperature in the pipe loop is protected from rising above 50°C. Using the temperature limiter eliminates the need to install a mixing valve and an additional pump. This is the reason fo using it in combined underfloor and radiator heating systems. Temperatures may be set within the 0-50°C range.