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#3 and 4 are just bonkers and wouldn't work at all (no flow). :) The issue with #2 is that the new radiator would heat up even when hot water (only) is called for. It shouldn't short cycle any more than any other radiator though as as the lockshield would be throttled to create an 11C/20C drop...

That sounds rather more sensible.. ;-)

0 is lowest (easiest to pass), clockwise to 7 is highest (hardest; effectively closed as tight as can be noting it's a spring so could still open given enough pressure).

Picturing a condensing boiler in my mind (based on assumptions at least!) I'm imagining pouring water through the flue would enter the combustion chamber and subsequently the syphon. Sounds so wrong though (although that's what happens to the condensate) so let someone who knows what they're...

I mean no disrespect (as I know how helpful you are on here) but that's an example of the worst kind of responses when help is being sought yet is seemingly commonplace on Internet forums. It's of little use to the OP, at best might just make them feel rubbish (and ripped off if they'd paid for...

I forgot to close this one off but thought it worthwhile for the sake of the archives... I removed the bypass valve and indeed found it be passing regardless what setting it was on. The spring was still intact but it seems that the valve seat wasn't sealing regardless. If I still have it I...

I know what you mean, and I'm struggling to counter the explanation. I do believe the vessel is meant to absorb and release the additional pressure in a way that keeps the net pressure the same - you shouldn't be seeing its effect. Its like you letting people in and out of a room via the front...

That to me would (I think?) suggest the vessel isn't charged and the burst you're seeing is a result of the high pressure being released from the pipework and cylinder. The purpose of the vessel is to prevent this pressure increase (by expanding the balloon inside) from happening but if it's...

You could try closing the tap slowly and see if that avoids it... I'm just thinking anything really that might help pinpoint the cause when considered with other observations. Is the expansion vessel charged?

Something I've noticed round here is that early in the morning (and indeed overnight) the pressure is slightly higher than what it is during the day and I've always put this down to how many others are drawing from the network at these different times. Looking at the timestamps, if you were up...

The pump goes off? No, that shouldn't be happening. A pointer or red herring though? I'd struggle to assume it's not the former...

There is circulation but I was just wondering if there's was enough. Have tried changing the pump speed? (Sorry if I missed it)

I'm no expert but given the flow is at 80 and the return 55 that's quite a delta which suggests to me either humungous radiators or, more likely, poor circulation and the heat not been drawn away from the boiler quick enough. Perhaps the boiler is sensing this and turning the burner off? (Just...

You haven't mentioned radiator temperatures. Are they hot, really hot? (>60C) Are you able to measure the flow and return temperatures? I could certainly imagine that if the flow temp is too low (perhaps *set* too low i.e. not a fault) then you might see symptoms you've got given the current...

I feel like I'm asking the obvious here so forgive me if it sounds patronising, but might it not have realised the syphon had finished filling? More to the point perhaps, I assume it had actually finished?

Ah, well actually I'm one of the amateurs asking more questions than giving answers!

Sure - help yourself!

I was going to have a rant about incompetent tradesmen but your post has made me think more positively... I reckon to be competent you have to be interested, and so a forum like this with some on that do this for a living happy to be talking about their line of work 'after hours' is a clear...

@Lower It looks like you were right - stability has definitely improved over time:

I could be wrong but I doubt a litmus test would tell you all that much about inhibitor concentration. Inhibitor test kits aren't litmus tests; they measure the relative quantity of the active chemicals (molybdates) that makes up the inhibitor. Regarding the OP, most inhibitors I've seen say...