The DT4 room thermostats allow you to control the room temperature of heating systems designed for houses and apartments and combine a modern design with simple functionality, a large, clear LED segment display and an easy-to-use Wake-up button. The DT4 is compatible with hybrid and more environmentally friendly energy systems as well as high-efficiency solutions, including heat pumps, zoning devices, underfloor heating / cooling, and it also works with zone valve applications.