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The Viessmann 100s combis I've seen have all suffered from a black material inside the (presumably) rubber flexibles inside the boiler. We mainly fitted the heat only 100s which haven't got this problem. I don't know what the material is that forms on the inside of the hoses (making them...

Steelmasons is right on the money. 5 pages and his post is all you need. The Mk2 ecoTEC, in all its plastic glory, has some 'clever' software that makes assumptions on flow and return temperatures. If an installer, for example, fits a 637 (37Kw in out of the box default mode) to undersized...

15mm bending spring goes round the outside of the type with air slots in the PVC cover

JTM list the threaded types in the link, for HVAC use we don't import things from China.

You either need the adaptor, or to purchase the correct oil lines. Some of the earlier Worcester boilers came with male adaptors on the oil pump; I usually remove these and replace with the male angled hoses on the annual service as it reduces the number of spares on the van. Later Greenstars...

You will need a pipe threader to create a male thread on the tube. This is where this work starts to get expensive. The tube comes in (typically) 3m and 6m lengths with a thread at one end and a socket at the other, either galvanised or red oxide.

We've been getting screwed steel flanges from JTM Plumbing for a commercial install. BSS can be very pricey and so so slow. http://www.jtmplumbing.co.uk/pipe-fittings-c433/flanges-c371

Evohome does not use WiFi for linking any of the Honeywell components, it uses a proprietary radio channel developed in 1996 for a similar, earlier Honeywell home automation product. That product used the remote TRVs you have reliability concerns about. I have 26 of them in my house, all...

Brilliant. Have you thought about reading the instructions for the unvented? It's all in there. As many of us installers will tell you, the instructions are only there to level the cylinder up. I would say 30% of unventeds I see haven't been installed as per, so kpw, you are on a roll...

So if it is outside the UK, why are you ordering a UK electric shower? What is a 'typical electric shower'? Sounds like the 900 litre vessel might be an accumulator.

Classic???

You would have to satisfy yourself that the air inlet would not be vitiated by all the other flues. You could test the area with an analyser but the results would only be valid that day. Different temperatures and winds could make the readings very different. I would walk away from this one...

The critical issue is the fact that the glass canopy encloses the air and appears to be closed at at least one end. You will see that the Vaillant guide assumes open ends, which will allow combustion products to disperse.

I wouldn't put my name to any boiler fitted in that location. My memory tells me that if the awning is open at both ends it might be considered acceptable; however, the standards and guidance assume one boiler, not many. It is clear to me that on a non windy, cold day, the air inside the...

That's a kind offer, and I would like to take it up.

I saw one at EcoBuild a few years back. Which is where the Dutch HA story came up again. The rep dismantled one for me. I don't get the bithermic heat exchanger story. It hasn't proved to be the answer in previous incarnations and, as far as I know, the same problems remain, because Dan is...

C=Comfort in Vaillant terminology. Try running a hot tap and feeling the central heating pipe on the far left, it should not get very hot. Also check turning the HW temp knob; does it aqdjust the LCD temp display whilst it is being turned?

I'm ashamed to say I was duped by Nefit/Buderus 15 yrs ago into fitting their small boilers on the basis of excellent reliability claims from the Netherlands. The Dutch 'Housing Association' story has been used by many indigenous manufacturers, I was swayed - the first time I heard it. Now I...

Look on this very forum around ten years back and the 'pro's' were describing Keston as the second coming. They then went behind the Broag Avanta, that was a turd as well. Frankly, this forum has got a bad track record for selecting durable boilers.

ATAG offer a twin pipe solution, there are others.