Recess-mounted installation device compatible with the standard industry series, which perfectly fits in any environment thanks to 3 different finishes. It features two temperature-control modes: differential and integral proportional. This feature reduces the boiler switch-on times with respect to the difference between the room temperature and the set temperature. In this way it is possible to optimize consumption and keep comfort at optimum levels. It is set up to be remotely controlled via a standard telephone dialler.