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Your advice and help much appreciated RoyC, I'll give it a go.

Thanks Roy C, but I am concerned about cold bridges and condensation on the base plate. I want to create as much of a thermal break between the metal and the plasterboard as I can. The insulating plasterboard will help and I thought that the foam would help as well as sticking the plasterboard...

I am in the process of replacing rotten timber window lintels in an old house. The new Lintel per Structural Engineer will result in a galvanised steel plate as the internal soffit which will subsequently need to be plastered. I was thinking of using insulated plaster board fixed with aerosol...

Agile, Thanks for your comments, I respect your position and appreciate that you cannot make recommendations re pressurised systems. Prior to deciding what to install I did ask the Installer whether the supply pressure was adequate. He said that he thought it was and despite the apparent ‘low’...

Agile, I apologise for persisting with this but I have been trying without success to get this problem sorted by Range and the installer for the last 12 months. I am trying to contact them again, but I need to understand the problem myself first so that I do not get bamboozled by them when I do...

Agile, appreciate your comments and reasons but could you please at least answer me this: if the incoming pressure at the PRV is around 2.2bar do you consider that dropping the EV to circa 1.7bar which seems to be the low point at which the juddering disappears, could be ‘dangerous’?

Thanks for the replies and advice - Going to see Vauxhall later this week, so will get them to sort out the problem.

Agile, Please excuse my layman understanding of this but what do you mean by "does not need a low resistance pipe into it"? and does "be inclined to increase the resistance " mean increase the pressure in the EV or as 'Wetshoes' suggests decrease it?

Thanks to all for helpful suggestions, been trying to resolve the problem. Before Christmas Manufacturer said to drop EV to same as incoming, ie 2.2bar per their gauge. Result: the pipe to the EV juddered violently whenever a hot tap was turned on. I got Water board to visit and check...

Main Vauxhall dealer did an oil change on my 57 plate Vectra, but used incorrect oil (10w 40), instead of fully synthetic 5w 30. They have now changed it to correct oil, but suggested the only way to check for any damage or engine wear is to take engine apart and rebuild. Can anyone give any...

We get the vibrating/juddering of the pipe to the EV as well, although like the bang its very irregular with no recognisable pattern and is less frequent than the bang. I checked the EV pressure myself the other day (Water supply off, Taps turned on) and according to my tyre pressure gauge it's...

Thankyou to all who have replied. The HW tank is a Range Tribune and the EV is a Varem, as supplied by Range. One or two have suggested turning the EV around so that the pipework comes out from the top but thinking about that, wouldn't the water, at least some of it, in the EV become locked in...

Pioneer, Gasguru, The EV is currently fitted with the Schroeder valve at the top, although when the Engineer fitted the first replacement vessel he did put it up the other way but it made no difference. In fact I queried it with the Engineer when he did fit it the other way and he said it...

Picasso, I don't know what the incoming cold pressure is at but there is a PRV to 3bar just after the stop valve into the house, along with another in the combined PRV/non return valve just before entry to the HW tank. I assumed that the precharge on the EV was checked by the Engineer before...

Yes, it was for this problem. It has been the same since the system was installed 12 months ago despite the various changed components.

He's replaced: 1. the EV, firstly for an 18ltr then for a 25ltr. 2. the PRV and Non return valve which come as a composite unit adjacent to the HW tank. 3. He's installed another PRV on the incoming CW feed just after the CW stop valve as the feed enters the house.

New Install 12 months ago. Greenstar 24i Boiler 150 litre unvented HW tank Separate 25 litre wall mounted Exp Vessel, pressure ok at 3bar. (originally 12ltrs then 18ltrs.) Pressure Reducing, Non return, Temp & Pressure relief valves etc fitted. HW tank Thermostat, set at 45 but producing 60...

Thank you all for your help.

As a result of an extension to the side of our house what was once an external wall is now an internal wall. There is no cavity fill. Is there any reason why I cannot now use the cavity of this internal wall to run cables? regards

I may do that but was looking for some feedback on experience and relaibility of the different makes.