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Would say it's 240V as only checked with fluke - will get my multi-meter hooked up when have some spare time Would have to open the boiler to check that which is not recommended by unqualified person. No N/A Next to the boiler (1st floor) If I can power the Heat Link from the boiler...

Dan - I'm just asking - again this is what the forum is for - really no need to be rude...

Thanks a lot Bernard. I understand I should be able to control the temperature at home if new thermostat wired per diagram. Is there an option to control a hot water from the same new Nest thermostat too ? - are additional wires required to achieve this? - currently I can do it only directly...

Jon what do you mean I have destroyed my stat with both examples....? The "Current" diagram is showing how it is connected right now and it's working fine. The "New" diagram is showing how I was thinking to get this connected (Ok the US version is 24V english is 12 V but this is supplied by...

Ok so I have created very simple diagram and was wondering is I could re-use the existing cables which are currently connected to my old thermostat and get them connected to the Heat Link or perhaps I would need a plumber to open my boiler and connect wires to a new boiler terminals?

Ok the boiler is "Vaillant ecoTEC plus 824 (VUM GB 246/3-5)"

You have asked what boiler do I have and before I actually replied to this Jon has "re-edited" my post to make a laugh. I had a bad experience previously with plumbers but I wasn't calling anyone on this forum a "cowboy plumber" - I was not even aware that you guys are plumbers and this is what...

in regards to what?

Dan - no one is calling you or Jon a cowboy plumber, at least not me. What I was saying is these type of forums are here to help people not laugh at them... I was just hoping someone can point me to right direction rather saying "call qualified plumber as you may kill yourself" If you guys...

Yes Jon the forum is to make a laugh from someone who is seeking some help to do the job by himself rather that paying for a top quality service that I wouldn't be happy with anyway - as I have said - learnt from my own experience and trust me it's not about the money but I can understand...

If you know better why do you ask all those questions? - keep it for yourself Aquaheat. I know from experience these guys are only interested in quick profit and nothing else - they don't care how the cables are routed as long as it's easy for them.

Thanks for the advice but still prefer to do it by myself - aesthetic reasons. Just need to some help in understanding how it works and it looks like I'm pretty close. Will provide you guys with my boiler made/model no. I haven't got a programmer, it is just a combi boiler (I think it's...

Ok will confirm tonight

What details do you need to know? I'm still bit confused with my current thermostat as it looks like brown wire connected to terminal #3 is always live and blue wire connected to terminal #1 is live only when "call-for-heat"? Is that correct?

Ok, I did some more research and it looks like I have been looking at US website which was saying Nest isn't compatible with my system. Here in UK I need to use Heat Link which is provided with thermostat. I need to run new 3-core cable from Heat Link to junction box (if I have one) or...

It's a simple boiler - don't remember the brand of it would have to check later this evening. I would like to have nice digital interface where I can set temperature possibly controlled via app remotely from my smartphone. Not too sure what is compatible with my 2-wire old thermostat. What...

Hello guys, I'm currently in the middle of refurbishment work and would like to replace my old Honeywell T6360B with something more decent if possible (ideal Nest but not too sure if compatible with my boiler) It seems to be only 3 wires are connected (see attached photo): blue wire -...