I have for a long time 3 pieces of this thermostats in operation. They regulate how programmed look chic, are relatively easy to program and make unfortunately by the plastic objects a rather simple impression. Here is one already exited after one year with an error - in the cold season especially annoying. This was indeed easily replaced with a new one, but since this is apparently not an isolated case, I'm not really convinced of the quality. Since I have not tested any alternatives, I can recommend anything, but I'll rather take me from this strain no further into the house. There are devices that need to just work - in my experience, I trust the manufacturer no longer - even not at all in the price.
So, the addendum of 12:04:15: Yesterday is the second of 3 purchased equipment after only 16 months dropped out. Heating was full on, display illuminated and there was a code that is not described anywhere. Neither reset even battery exchange brought improvement, tomorrow it goes so the manufacturer for replacement.
After my previous experience, I would advise against the purchase. When these things go, they are going well. Unfortunately, however, the operation and the quality seems to be totally unreliable, which is just at a heating control, a no-go. A Amortization of acquisition costs over an oil savings is probably nothing.
