The RA/VL series, RA 2950 offers a complete range of robust radiator thermostats for all central and urban heating systems. The RA/VL, RA 2950 thermostats are gas thermostats with an impressive response time of 10 minutes. Easy installation via snap closure, no tools needed. Self-regulating thermostatic valves can save a lot of energy. Studies show a potential energy savings between 30 and 36% when switching from manual to thermostatic valves. Switching from a thermostat over 15 years old to an electronic thermostat can save 23%. The newer the technology, the higher the savings.