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Thanks - I did say this to them but I'm arranging a service of the system with the installers and will hopefully have everything resolved at that point. For now though, at least we haven't got warm water from the cylinder entering the cold water supply but I'm a bit concerned about the potential...

Just to close this off, the engineer visited today and confirmed that there was an error in the installation: the pipework to the balanced takeoff should have been routed to the primary output (incorporating a check valve) and the pipework to the primary output should have been routed to the...

Just to revisit the diagram again - the more I look at it the more I think that it's wrong: The cold main is entering the group valve and the first thing is to regulate the pressure to match the cylinder. The first takeoff from the valve is optional and can be used as a balanced output for...

Thanks - that certainly sounds sensible but the temperature was configured by the Vaillant engineer who commissioned the system. I also picked up some advice on the Vaillant Arotherm Plus Facebook group: https://www.heatgeek.com/hot-water-temperature-scalding-and-legionella Half the problem...

Thanks - I'll do as you say regarding the pump - my DHW temperature is set to 52 degC (ASHP flow is at 45 degC) so I do rely on refreshing the water in the cylinder regularly. As for the original builder, he's lost out on a *lot* more work - that's the way I'm looking at it :)

The plant room work was implemented by the ASHP installer (all in press fit as you see) and was then reviewed by a Vaillant engineer - everything after the gate valves to the DHW, cold supply and UFH pipes was installed by the builder (the builder won't be coming back).

To be fair, I've just looked this morning as far as I could into the ceiling space and it looks like it's in copper. I remember seeing lots of plastic pipe before the plasterboard was fitted but didn't think to take any photos at the time. I can say that all of the pipework to the UFH manifold...

Sorry if I've misled you - the pipework in the plant room is all in copper. At the point where it leaves the plant room, it's then in plastic. The attached picture shows the installation before the engineer came back to complete the work.

Yes - I've had a look at the "group valve" specification and it's odd how it's been configured. Regarding the link that bypasses the group valve, the installation engineer fitted that at a later date to the original installation (about a week later) and also added the pipework for the tundish...

I believe it's JG.

All of the pipework other than in the "plant room" is in plastic but it's not insulated. Of note is that the temperature is consistent no matter which tap you try, from the sink closest to the heat source, all the way to the kitchen which is the furthest point.

Sorry, I meant to say that I have run the furthest cold tap enough to clear the pipe volume but it still doesn't run cold. I'll give it another go tomorrow though and run it for a good five minutes. I only ran it for two minutes but we do have very high water pressure...

I didn't say I was willing to ignore it - I just said I doubted it as everything's new (I should have said that in my original post of course) and mixers tend to fail over time (caveat - only what I've read on Google) rather than being faulty out of the box (touch wood). The cold water is...

I think the check valve should be moved above the next junction and just after the "Cold Cylinder" gate valve which means it can only pass into the cylinder's CW inlet. Having it immediately after the pump achieves nothing other than preventing cold water from entering the pump and on into the...

Everything is brand new - I doubt it's the mixers.

Hi, I'm having a problem with my plumbing - the builder responsible has long since "departed" and I've only noticed a problem when I've increased the time/duration of my recirculation cycle. It seems that the cold water tap is now producing relatively warm water and I'm concerned that warm...

Sorry, I thought I'd answered the original question about egress but I can't have clicked on "Post Reply" - I've done so now. There's another pair of French doors which *will* have a balcony. I need to arrange a visit from the BI anyway so I'll ask them then about a suitable internal barrier -...

I would prefer to be able to semi-permanently secure the doors - it just made sense to me that if the sash can be secured, it's logically the same as framed glass. I can always apply for the balcony again but the people involved are "unreasonable" if you get my drift.

Yes, there's another pair of French doors and there will be a balcony for these.

Hi, I've had French doors fitted to a first-floor bedroom in anticipation of having a balcony installed. However, due to a change in circumstances, I may not install the balcony after all (it might be something I do in the future though) and I'm looking for a way of making the doors safe and...