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Just a quick update... It occurred to me that before the Magnacleanse, the thermostat on the HW cylinder was set at 60 degrees. For some reason, after the Magnacleanse my plumber set it to 65 degrees. I set it back to 60 degrees a couple of days ago and lo and behold it 'appears' (touch wood)...

Okay, I can certainly run the boiler for an extended length of time and see what impact that has overall... By the boiler circ pump are you referring to the external pump (shown in the earlier photo) or is that a different pump inside the boiler itself? I only ask because the external pump...

Many thanks for your detailed calculations, I suppose my questions would be: Why would this have suddenly changed over the last few weeks when for the past ten years, running the boiler for 20 minutes has produced piping hot water? When this issue first started happening, i.e., the hot water...

It does... at the end of the first test the meter reading was 01317.000 m3 and at the start of the second test, (after letting the boiler run for five minutes prior to taking any readings) the meter reading was 01317.160 m3 First Test Running for Three Minutes End Reading - 01317.000 m3 Start...

Apologies, that was a typo by me, it should have read... After 3 Minutes - 01317.223 m3 Before HW on - 01317.160 m3 Total Usage = 0.063 m3

Yes, the boiler does apparently modulate... Okay, so that seems to have provided a more sensible reading... After 3 Minutes - 01317.223 m3 Before HW on - 01316.160 m3 Total Usage = 0.063 m3

That is good to know... One thing that did occur to me but sounds as though it may not be the case is that, in my initial post I mentioned the following: Thinking about that made me wonder whether in fact, the hot water cylinder thinks the hot water has reached the correct temperature and so...

I did and yes, that resulted in 'proper' hot water the following day, but since then I've had it back on 20 minutes to see what real difference it's made and it's slowly reverted back to lukewarm water. In the ten years I've had this boiler I've never once had to run it for 45 minutes to get...

Just providing an update to this thread... Having tried everything suggested above, apart from slackening the top coil compression nut 3/4 of a turn at the cylinder and pulling it back the pipe to release any air, if present I still have the same issue. I decided to check the hot water...

Thanks for clarifying... will just run for 45 mins and see if that changes anything... many thanks

It could well be, I simply did a hand touch to feel how hot both pipes were... I assume you mean this one? I also assume I would do that when the boiler is not running is that correct? If I try that would I expect to hear a release of air if there is any trapped or for any water to seep out...

Yes, they both seem to be as hot as each other I would say...

Just reporting back to say that opening the air vent on the inlet pipe made no difference... The pipe coming off the bottom of the coil (outlet) is indeed very hot, i.e. the one shown in red in the photo but when drawing hot water by turning the hot water tap on the pipe that comes out of the...

It's 900 x 450 (36" x 18") so 120 litres... I'll check the pipe coming off the bottom of the coil (outlet) in the morning when the boiler kicks in, previously it has certainly been 'hot'... Just checked the F&E tank and there is indeed water in there...

I'm not entirely sure in as much as the boiler itself only has a dial that goes from Low to High (see photo) and doesn't specify any particular temperature... This is the setting I've had it on since the boiler was installed (set by the plumber who installed it) and previously it's worked...

Thanks, that makes sense... I'll see how the hot water performs tomorrow and I'll update this thread accordingly...

Thanks for letting me know... is there any obvious way I would be able to tell, i.e., when the boiler is running would I expect to hear air or water escaping or would this only happen if there is air trapped in the pipe?

How would I know if it had failed?

No air or water came out when I loosened the little black cap. The screw itself is moderately stiff but maybe that's normal as it's pretty short anyway. I'll leave it positioned as shown in the previous photo and see if that makes any difference and if not I'll report back tomorrow... Many...

It wasn't particularly loose so I've unscrewed it a little (see photo). Should this be loose all the time, i.e., halfway unscrewed or should unscrewing it release air when the boiler is off or would air only be released when the boiler is running to heat the water much like bleeding a radiator...