steveoelliott

OK, so my plumber came today and for the first time I reproduced it with him in the loft next to the cylinder. I had him out to replace the NRV, T&P and EV. Figured I'd make sure everything had been done but after hearing the noise he told me it is definitely coming from inside the cylinder. On another group a plumber suggested that the breakup of the baffle can cause this noise as it catches / releases. Anyway, I've contacted Baxi to get a replacement.

Some very good points here. Thank you.

This is all excellent advice. I am delighted that the process should be much less expensive than anticipated.

On one of the houses I currently own, I have a significantly sized rear garden with the plot extending six meters to side of the house, allowing for a separate driveway. The rear garden would easily accommodate a semi detached bungalow (2 dwellings) and with access and other recent developments around us, I suspect there would be a reasonable prospect of approval. If approved, it's likely we would simply sell with the planning in place. The challenge is I don't know where to start with this... I have been told the best thing to do in the first instance is to get outline planning permission but presumably I need an architect for that. I was wondering if somebody could outline the steps from concept to submitting for outline planning approval and rough costs. Thank you

I’ve decided that I’m going to remove the NRV on the top of the cylinder and replace the T&P valve whilst I have the plumber out. After that the only part not replaced will be the EV.

Well, I can firstly confirm the cylinder has a single check valve and not a double. @Nickfromwales I have once again been able to reproduce this issue and I am confident the external EV plays no part in this. When this video was taken a significant amount of hot water had been used since the last heating cycle and testament to this fact is the EV was cold to the touch as was the pipe between that and the cylinder. I am leaning towards thinking either a dodgy NRV or something within the cylinder. Interestingly, this time the noise was much louder and echo's. Any feedback welcomed. I've decided the next course of action is the NRV. Interestingly, if you watch the video zoomed in you can see the tundish and pipe around it vibrate with the noise. I am even curious if this could be the PRV but I can't think of any reason why it would do this. No water residue in tundish. Img 4767-1.mp4

I wondered that… there is concrete around them. Looks like they came clean out / just lifted out. I wasn’t there to watch that bit but the gate had been there for years prior.

I'm no expert but slotting posts in those gaps surely would never work without them being properly concreted in. I also believe the posts they use are slightly bigger anyway.

Bottom line is, I will be there before they start work and will make it clear that this MUST happen. In addition, I do have it in writing that they will make good any collateral damage. However, I'd rather not have the pain and stress!

Hi Folks, I am having a new gateway and fence provided free of charge by one of the big developers building adjacent to our plot. It's a long story but it was mutually beneficial for them to do this. Per the attached picture, their groundwork's team removed the old fence posts and somehow managed to do this without disturbing the blocks. The post on the leftmost side of the picture was attached to the wall of our house with coach bolts. They are going to come back to remove the existing concrete under these blocks, which will involve them removing blocks and digging / breaking out the old concrete. Then of course, they will need to install the new fence posts and make good the block paving. Now, are there any gotchas I should be aware of with this / things I need to ensure they do... I do have water / power that runs under those blocks (middle of the gate) to the garage. I am informed by the site manager that they do this stuff regularly and have cat scanners etc. Thanks in advance...

Thanks… That said, it is strange that after the test I did yesterday, I can no longer reproduce the issue.

On another point, since running the test I carried out yesterday with the inlet valve shut, I cannot reproduce the noise once again. I imagine it will rear it's head again in time, but isn't that strange! I can't see how the 10-15 liters of water that got drained out of this whilst testing made any difference. The only thing I wonder is if something is adrift in the tank and moving around until a point it gets stuck / lodged. Pure speculation of course.

How would I check if it is a single vs double check? Excuse my ignorance. You make a good suggestion re the removal of the NRV. An easy thing to try. The incoming PRV on the main never goes much above 2.2 bar dynamic even wide open so that's the most mains pressure we get here. I guess it may occasionally go higher but I've never seen it.

Right, so today I did a new test. Shut off the incoming feed into the cylinder and was able to reproduce the problem. This in my opinion removed the possibility of anything on the inlet side. Img 4612-1.mp4

At which location? Between the reducing valve and EV or on the hot water outlet? I can't seem to find a pressure gauge that doesn't come as part of a PRV block.