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Per fitting, but be careful how much you read into this as it won't (can't) factor in the security of the board itself i.e. it might be held on with just a couple of screws, glued on, being held up by tape etc! I've seen some quite remarkable loads being held up by plasterboard alone but...

I'd suggest replacing the diaphragm - easy to do and no need for any dismantling (beyond what you've already done). https://www.fixthebog.uk/siamp-optima-49-50-flush-valve-seal-diaphragm-syphon-washer/? Before that though I'd try cleaning the existing diaphragm once more (and the surface it...

:D My Mum's just the same, and my gran was too. One day it'll be us...

Ah, see what you mean now. I was only thinking of hardwired valves (and when used with OT specifically). I can't help but feel that, feature/development wise at least, Nest is dead in the water. Doesn't seem to have been much - if any - innovation for quite some time now. I see there's a new...

I'll leave it to the pros to continue advising on the specifics of your setup/approach, but one comment I would make is to be cautious about taking heat loss calculations too literally. As you said there are components of your construction (eg windows ) that might not have been accurately...

Terrible aren't they - small recessed terminals, barely legible markings, hardly any room for wiring. The whole Heatlink seems of unnecessarily poor design eg CH/HW demand indicators but they're only active when you use the manual override - they're not used to indicate automatic demand which I...

Great! (y) It does reveal exactly why TRVs are worthwhile fitting though as the room the stat is no longer in will no longer be controlled in your Mum's setup. It's not the end of the world though so you/she shouldn't feel under pressure to change anything, particularly if she's constantly on...

Handy if you ever decide to move the room stat location (particularly a wireless one that presents no restrictions in doing so for the homeowner). Incidentally, I prefer to remove the TRV head and loosely fit the decorators cap. Reduces inadvertent adjustment by those used to 'tweaking' the TRV...

Yes, I was just saying that what originally led me to the OV18 was probably a search for heat only boilers but I have since broadened my scope to include system boilers too. I can see pros and cons with both.

Yes, you're probably right. All too easy to get things backwards, the subject is like working with double negatives at times (or should that be not unlike?!).

:D No problem at all... I appreciate the efforts anyway! I suspect I was just thinking about a like-for-like replacement for the Icos i.e. heat only, external pump, simple as possible etc.

Just reading the MIs for the SB18 and it says: That sounds somewhat contradictory to me? The first sentence implies that if *not* all radiators are fitted with TRVs then you don't need a bypass (which would make sense to me - there'd always be a water pathway available). But then the last...

Can't argue with that logic, and it's making me wonder what led me down the path to the OV18 in the first place now. Thanks!

Wow, that's like a candle! ;) Thanks, will take a look. I'd been led to believe (not sure where now to be honest; certainly not the MIs as they seem particularly light in detail on a variety of subjects) that the HREVOV18 can be used on a sealed system too. I'll check out the HRESB18 though...

We've currently got an Icos HE15 heat only boiler on an sealed system (and UVC with 19kW coil) and whilst it works well enough it is 13 years old now and so I've been thinking about what I might eventually replace it with when/before the time comes. The system is well balanced with an average...

Forgive me digging up this old thread, but I've just stumbled across it and was intrigued by the guidance in the attachment: I always thought (and with albeit limited experience) that it was the *opposite* of this i.e. if the temperature drop across the radiator was too low then you close the...

For many years I've been using a Honeywell CM927 thermostat that has managed rock-solid control of room/house temperatures. You can see the stability in the graph below - noting in particular the grey line representing the temperature in the room with the stat and the red line showing the...

Yes, and get a pack of o-rings too if my experience with what is admittedly a different make/model (WB 24CDi) is anything to go by as there's nothing worse than putting everything back together again and standing back to admire your handiwork than seeing a weeping joint right in the bowels of...

I must admit, I didn't realise 'AC95' was a model number - I assumed the AC95-240V was indicating the acceptable voltage range! (95v to 240v)! Perhaps at one time it was but has evolved into something of a model name what does appear to be a highly copied device.

So not the diagram you posted then... :sneaky: It's no bother though - follow SFK's instruction and you'll be fine.