ᐅ Air-to-water heat pump – smart thermostat

Created on: 19 Jun 2015 21:59
B
Bautraum2015
Hello everyone,

We are currently planning our home’s technical systems. We will be installing an air-to-water heat pump, and my husband saw these Nest thermostats at his brother-in-law’s place and now absolutely wants them. Setting aside that these devices are quite expensive… how much do typical thermostats usually cost? Of course, there are probably all kinds of price ranges, but I mean the standard white or gray control units. Does anyone have experience with Nest? Do they just look good, or are these thermostats also effective? Can you tell the heating specialist, “Hey, skip your usual thermostats and install these ones instead?”

Thanks in advance for your help.
Bautraum201520 Oct 2015 21:16
Thank you, Mycraft, for your clear summary! My husband reluctantly agrees.

Now for a somewhat unusual question:
These ERR units have to be installed (our builder says it’s unfortunately mandatory). However, my husband absolutely does not want to have these ugly devices in every room and is asking whether it is possible to install any standard recessed room thermostat, or if it has to be from the same series as the heating system manufacturer. As far as I understand, the wiring circuits for these room thermostats are all identical.
S
Saruss
20 Oct 2015 21:32
If it turns out that an energy performance certificate (EPC) does not make sense for your construction project (it’s best to have this double-checked by a professional), then you can also apply for an exemption.

There are also semi-concealed solutions that don’t look as bad. The question is which contractors offer which prices for these, or do you have the freedom to choose?
Mycraft20 Oct 2015 21:35
@Bautraum2015

You can confidently choose the simplest option offered to you. If the electrician can’t connect it and you lose your warranty because of that, it would be a false economy...

But with a properly calibrated heating system, you shouldn’t have to operate those devices again anyway... The simplest approach is exactly what I did: have them removed and have the builder deduct the RTDs (room temperature devices) from the contract.
Bautraum201520 Oct 2015 21:59
How can you get an exemption?
My husband doesn’t want to have these simple things hanging on the wall :/
Mycraft20 Oct 2015 22:21
Just type "Befreiungsantrag ERR" into a search engine and you will find what you need... Links are not allowed here.
WildThing21 Oct 2015 12:50
But this only works if you really don’t have any room that you heat just about once a month, right? We have a basement room that is planned to become a guest room and office at some point.
Currently, it’s not needed yet because we still have two rooms available upstairs that serve as the office and guest room for now.
What do you do in such a case?

And later on, the basement room might only be used every two weeks and not continuously. The other basement rooms, except for the corridor which serves as our entrance area, are unheated.