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I suspect not - the ST9400C is a programmer (timer, or rather two timers, to you and me) whereas the CM907 is a programmable thermostat (a combined timer and thermostat) so if you did swap it you'd be losing the thermostat aspect (and gaining a second timer!). Do you want to elaborate more...

No, you're mixing up your Nests there (easily done - they've got a terribly inconsistent approach to naming, and then there's the added complexity of US models being different to UK/Europe!).

I can't imagine it could be damaged as if they are going to stick a USB port on it they must accept that someone might plug the supplied USB power supply or a data cable into it at some point - whether out of curiosity or simply not reading the instructions in all the excitement of unboxing the...

@old duffer I think you're in the wrong thread. :-)

As I say, my Honeywell allows such an adjustment so I'm not sure where you're going with that one. The downside of that particular approach is that it is quite a crude controller and doesn't provide TPI control and so would be a step backwards in terms of stability of output. If @PaulUszak was...

Is any system compatible with a controller that might make a call for heat as short as 40 seconds? What might be a good example of one that would suit such short bursts? It does sound a bit nuts to me and I can see why @PaulUszak is asking if it's normal or not. Might it be something that can be...

Yes. The pressure differential created by heating the water is relatively small (and certainly when compared to that from a circulating pump) and the flow rate for any given pressure differential is proportional to the radius of the pipe hence the need for large(r) pipes.

You should be able to relocate the backplate slightly higher up the wall - far enough to give you enough cable slack for a good strain-free connection to be made but not so far as to require any making good of the old cable hole.

Yeah it'd be pretty old school. Before we were born most likely let's just say... ;) If @Fallout doesn't have a C-plan setup but rather S-plan then obviously they can just terminate the white wire safely and tuck it out of the way. Note that the wiring diagram looks like it isn't quite...

It does, but I was assuming that with it being a new build and with a design that includes continuous mechanical ventilation that they'd also be aiming for high air tightness levels and so might have provisioned for improving localised ventilation such as trickle vents in wet rooms. Oh...

It is used in conjunction with a C-plan setup, for gravity DHW and pumped CH. It enables a DHW call for heat to be satisfied without causing the pump to run if there isn't also a demand for CH.

I didn't think a new build would be 'leaky' enough to enable the PIV to function correctly, particularly without the likes of trickle vents. I guess it does though, at least on paper? Does the bathroom clear of its own accord without the window being open? Note that with continuous whole-house...

Is it definitely a positive pressure system? I am surprised it would meet the building regs for a new build given the lack of explicit extraction (and the counter requirement for air tightness). As to your specific question though, I suppose the only answer is 'until humidity levels resume to...

I've emailed Resideo but fault-finding might be limited now as the issue has resolved itself - as half expected the US having turned their clocks back (at 2am this morning, not the evening/night as I assumed) and everything is now back in sync.

I have a feeling it'll resolve itself on Sunday evening when the US put their clocks back so I might've missed the boat with them being able to confirm the issue. Worth a try though - thanks.

Thank for that, I think I'll be going for an Intergas now and most likely the Xclusive so good to hear your initial concerns have now been assuaged. I too have previously considered smart TRVs but have always been put off by the cost. I'm not entirely clear why they cost what they do. I do...

Does anyone else here use Honeywell's API to access their thermostat? I am seeing what appears to be a bug in their system leading to results which are an hour behind... And I can't help but feel it is related to the clocks having gone back an hour on 31st Oct but the US not due to move until...

I forgot to ask you @sxturbo, out of interest what did you settle for in the end - bother boiler and controls?

Both of those devices are double-insulated and so don't themselves require earthing (i.e. there is no danger of the casing being made live as a result of an internal fault) and thus if an earth terminal is present it'll serve merely as a parking terminal (somewhere to keep the stray earth wire...

Be careful about mixing up modulation (generically 'to change something to better suit the situation') that the boiler itself can perform and that which external controls can apply. Taking the former, even with just a binary 'gives us heat!' call from your thermostat, the boiler heats the flow...