The reason is that after a power outage, the RT0700C restarted by itself if left switched on, which does not comply with safety regulations in the EU and many other regions of the world. The new RT0702C has an anti-restart safety function, which makes a hack necessary to be able to switch it on and off by a relay . I assume the 120 V version in the U.S., the RT0701C, will be replaced soon too.