Electric Floor Heating Thermostat Replacement

[TippyJones]

Hi Friends-
I am living in Germany and have electric floor heating. To save money, I am replacing the old analog thermostats with programmable digital thermostats.

The thermostat I have purchased has terminals for both the "load" and for the "supply". However, there is only one set of wires coming into the box (blue, black, and green/yellow). Does someone know which terminals I should be connecting these wires to? Please forgive my stupidity -- I am only smart enough with electricity to get in trouble. And I think I'm going to get into trouble without some help.

Here is an image of the back of the new thermostat.

http://ecx.images-amazon.com/images/I/41m7+-0aTCL.jpg

 

[winston1]

Hi Friends-
. To save money, I am replacing the old analog thermostats with programmable digital thermostats.

Why do you think this will save money?

 

[TippyJones]

Hi Friends-
. To save money, I am replacing the old analog thermostats with programmable digital thermostats.

Why do you think this will save money?

Because the new thermostat is programmable and I can program when the heating turns on, rather than having it continuously running. For example, I can program the bathroom floor to be heating from 4 am to 6 am so when I wake up, it's nice and toasty, but then program it to be off during the day while no one is there.

 

[bernardgreen]

If the old thermostat only had two wires and earth then it didn't have a Neutral and so operated with a Neutral.

The new one requires a Neutral to operate. So unless you can add a third wire to bring a Neutral to the thermostats location it is unlikely you can use the new one.

 

[OwainDIYer]

Hi Friends-
However, there is only one set of wires coming into the box (blue, black, and green/yellow).

Possibly live and switched live, and they may control contactors (relays) at the consumer unit rather than switching the heating elements directly.