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So Hive not nest then? I gave up on nest as I couldn't work out how to make it send power to the boiler only when I wanted HW, but to send power to the boiler and pump on CH mode. Unless when you run through setup you can tell it that you have a gravity fed HW so it knows to send a fire to the...

I'm forgetting the nest, far too complicated! But so I understand what's what, when my programmer selects HW on the boiler fires via terminal 3. But when it selects CH the pump is turned on via terminal 4 but it also internally bridges terminal 3 and 4 together to also fire the boiler?

can I use the Nest though to: a) time the HW as I currently do with the old programmer, just with no thermostat to turn it off. b) provide power to the pump and the boiler when I want heating? If so which of the nest outlets do I need to use, and to what do they connect? Thanks

can I leave the existing programmer in place for the HW, and use the Nest for the CH? I thought I saw a diagram showing the existing programmer in place set to always on, with the nest in line to take over the on and off of the heating side?

checked and the programmer is as you said! I have updated the image. What if any thing can be done to make this system better whilst waiting for the money to replace/upgrade to a newer boiler? I have no thermostats at all at the moment and keep thinking this isnt ideal as the boiler will keep...

OK, so this is probably overkill but it would get me some brownie points. The other half got me a Nest for Christmas! I had been looking at them and I dont think she realised what might be required to fit it. Can the Nest 3G actually work this system. If so what would connect to what outlet...

HW can be turned on or off without the CH coming on. If I turn CH on the HW light also comes on. (When I first moved in some years ago, it was the opposite way around, I called a guy in to service the boiler and he fixed the issue with a switch behind the programmer [pumped/gravity its down now...

Sorry I am just trying to understand the type of system I have installed at home, and if it can be improved in anyway before I can afford to have it upgraded/replaced fully. I currently have an Ideal Concord W - WCF 255 A It has an old Programmer that has the option to program 2 on and off...