Me keeping my old wired thermostat on full blast is basically the same as not having one because it will never reach the full temp. There is a white box that will replace your segment timer. This box has one button on it which is a override on/off switch. The box connects to this nest thermostat and yes, basically it acts as an off switch when the heating reaches the desired temperature. It is fully programmable for on and off times for both heating and hot water. The nest guys on Facebook are fairly responsive. I had a few teething problems as the default settings work out how long it takes to get your home up to the desired, this turns your heating on before the set time so it's hot for the set time. I didn't like that so I turned that off... also if you haven't heated the hot water for over 2 hours straight in a 48 period, it pops it on for 2 hours to kill any bacteria which I turned off too.
Thanks for the reply but I don't really understand. I don't have a thermostat at all, and all the instructions I can find online reference essentially connecting into your existing thermostat in order to connect the nest. However I don't have one so I'm not sure what I would be connecting to? Based on what you're saying, thermostat is basically a clever on/off switch with some computational shenanigans going on inside. My existing segment timer is the same thing but without the smart bit. On that basis I assume the Nest somehow connects into my segment timer wiring and then adds the thermostat functionality to my system singlehandedly?
Yes. I kept my thermostat wired and just keep it on full... this cuts the heating off when it reaches the desired temp. By keeping the wired stat on full, it just acts as it's not there if that makes sense.
Folks - I managed to pick one of these up recently. My hot press currently only has a segment timer with "On/Off/Clock" settings. There is no thermostat in my house at the moment. Is this even compatible with my system? I can't seem to find an answer to this simple question anywhere - I believe (hope?) the answer is yes, it's compatible! @PAULTRD @chrisom
In my case a Worcester Bosch CDI Combi , I needed to connect 3 wires , live , neutral , & switched live from the boiler to the nest heat link . Then added a looped wire in the heat link . So my example of it being "like " wiring a plug is because of the number of connections-3 , plus my ability to read both my boiler manual & the nest manual to know where the connections go . I found it straightforward & simple