Owning your own home

We have the same boiler, I'm very interested to see how this pans out! Except ours has a stupid wireless programmer thing snapped into the front of the panel which is total dogshit.

I have a mechanical programmer, I looked at removing that and decided to leave it in place set to "always on".

My understanding - which I encourage you to check- is as follows:

The boiler turns on if these two conditions are met:

• Programmer is "on" for the time in question
  
• The thermostat shows that the temperature is below that at which it is set
  
  

Now we can ignore the first one - I've turned it to on all the time.

The second one (thermostat) is, in reality, simply voltage on a line - the "Call for heat" signal, which is generated (in the thermostat) when the unit closes a switch in response to the ambient temp being below whatever it is set to.

So what the Nest does is to put it's system (Heat Link and Thermostat unit, plus the web-based bits) in control of that "Call for heat" signal, which it sends whenever the conditions you set are met (time/date/temp).

Doubtless as I type this smoke is starting to coil out of my Heat Link....