RTW is a self-regulating proportional controller. RTW radiator thermostats can be used for all central and district heating systems. The construction is particularly robust, with both the upper limits for end stop strength and the upper limits for the bending force of the sensors exceeding the requirements of standard EN 215. With the RLV-KS type H-valve, each radiator valve with a center distance of 50 mm between the connections can be individually blocked. This allows for maintenance work to be carried out without affecting other parts of the system. RLV-KS is used in two-pipe systems. The RTW sensor is available in two variants, either with an RA connection or with an M30 connection. The thermostatic RTW sensor from Danfoss with RA connection has also received an energy efficiency rating of A.