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Thanks for the replies. I will try to ignore the fact that some of the replies seem to be a little bit, how should I say....grumpy? All I'm asking for is a little advice. So I will assume that I am simply misreading the tone of your replies. We have the heating on all night currently with the...

Hi everyone, Any help with the following would be much appreciated. I got a Worcester Bosch 24i system boiler installed about 18-24 months ago. This boiler feeds a Prostel unvented cylinder. We have lots of hot water, lovely pressure etc etc. The boiler is in a bathroom airing cupboard and...

Hi All, Well I got an engineer round and it turned out to be the PRV after all. A few turns of the screw inside to adjust it, then a check of the static pressure at the shower upped the pressure enough to give us better results in the loft bathroom. It pays to be persistent! Thanks to all for...

Hi @Madrab Yes I totally agree. I have a qualified plumber coming on Thursday to do the cylinder service and to try to help fix the issue. In the short term, with the safety backups in place (temp/pressure release valves - one in multibloc and one from cylinder into tundish) I was happy, under...

Hi Madrab I spoke directly with technical support at RM Cylinders and they gave me advice to inspect and clean the cylinder as part of the monobloc. This was pretty straightforward but did not show any specific issue with the device. The gauze was clean, the spring operational and no bits of...

@Madrab and @flameport It would appear I can get a new cartridge for the multibloc inlet. see this: http://www.unventedcomponentseurope.com/rm-cylinders-3-bar-cartridge-for-multibloc-inlet-control-group-rpcw11.html Could I simply shut off the water supply to the cylinder, then remove the...

Ok thanks for the info. Is there anything adjustable/cleanable behind those plastic caps (adjustable valve/cleanable filter etc)? Not that I would do it but wondering if the engineer might.

Well that's a pretty definitive, and I'd say exciting answer! Thanks for that. Quick check - when I say that I can stop that water coming out of the bath tap it does actually spray a little as I push with my thumb and it does take a bit of a press but I can stop it completely without very much...

Hi @Madrab Thanks very much for your response. I just added Chrishutt in case no one else saw the thread :-) Of course I am certain that you guys know your stuff too. I just REALLY want to find out whats going on here. When I'm home I'll take a photo of the PRV and post it here. Hopefully then...

@chrishutt I'm hoping to loop you into this as your previous posts suggest you really know what you're talking about regarding pressure and flow and unvented systems. I hope you can help! Cheers, Wes

@muggles @Madrab @simond Hi again! Its been a while but I thought I'd post an update on this. The installer of the unvented system came around (nice guy - he really wanted to help) to investigate the issue. First off he tested the flow rate and the pressure. Both were off the scale - over 4...

Hi, Wow I like leaving big gaps between replies here don't I? You wouldn't guess I have a 4 month old baby! Anyway, yes the mains pressure was tested and all was supposedly well. I have also contacted Bathstore and they tell me the shower is rated for 1.5 bar and the shower valve for 0.1 bar...

Hi. Thanks for the response and sorry for the late reply....we have had a baby boy since your replies! :) Anyway, to answer the questions, yes both tap and shower have the lower pressure and it affects both hot and cold. The basin taps and the shower both stop if the bath is run downstairs...

Hi - please help if you can A year ago I had a very old vented system replaced by a Worcester boiler and a non-megaflow unvented cylinder (I think its a Prostel). This has been fantastic - great shower in the main bathroom. Bath fills fast. Hot water at mains pressure/flow rate. Terrific...

I can't seem to bleed anything from them, no. Boiler was installed late 04. I'll have a check as you advise and let you know. Thanks very much for your help so far.

Just as an extra bit of info - I dont think that there can be much in the way of sludge in the system as the radiators heat up fully top to bottom.

Hi again, So I checked it out last night and the noise is coming from each radiator individually. When the hot tap is used, this seems to create some sort of flow in the radiators - I dont understand why this happens at all! So there are two issues.... 1) What could be causing the noise in...

Thanks for the reply. I dont think it is - that thought occurred to me as well and I briefly tried to check this. I will check again - but what could it be if this is not the case? The main point is why should this happen when the hot tap is turned on?

Please help if possible. I have a BAXI 105he boiler attached to 6 radiators throughout my ground floor flat. When the heating first starts pumping hot water around the system, every radiator immediately makes an odd swooshing noise for a couple of seconds and then stops. I think this may be...