Excellent classic now in better housing

Video at Amazon.com View HR-20 Honeywell has long been a classic among the electronic thermostatic valves. In addition to the HR-20, there was the HR-40 as expensive brother, which, however, the same technology, and only one case had wertigeres than the old HR-20. The housing of the old HR 20 was held a little cheap. The new HR20 style contains the same proven technology as the old HR-20 and HR-40, even the same software version. However, the new HR20-style offers an attractive housing which is moreover processed very valuable. So I can only recommend absolutely the HR20-style.

For device itself just look at the video I've taken)