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I'm talking about the pipes carrying the hot water between the boiler and the location where there are valves which direct water to the two heating circuits and/or the hot water cylinder as appropriate. I thought these pipes are called the boiler flow and return, but if I'm using the wrong...

Yes we are. The flow and return between boiler and hot water cylinder cupboard (where the zone valves and everything else is) is 22mm and one plumber is telling me that's fine, and another is telling me that it should be 28mm. There are ALSO problems with the tundish pipework, along with...

This is referring to the pipe downstream of the tundish? There are different problems with that - both plumbers are agreed the D2 pipe (which is 22mm) doesn't meet requirements (too long, too many bends), but it only just doesn't and replacing it will be hellish (requiring taking out a...

Recap: I'm having an extension built with new boiler and complete re-plumb. I was slightly worried about the competence of the builder-appointed plumber. I asked for advice here and subsequently became very worried. Eventually the plumber was kicked off. He is Gas Safe registered for...

Yes I know. I said that about a hundred (or was it two hundred?) posts ago. I wouldn't have cocked it up either. Not in the same way, anyway.

No. I have a lump sum for the whole project which has been modified as we have tweaked things. On the heating side of things all I can tell you is that he wanted an extra £479 to make it two zones with a CM927 on the second, an extra £398 to add a kickspace heater in the kitchen and an...

FWIW, he's told the builder that he's requested Gas Safe to do an inspection himself, because he wants to clear his name and have it proved that he is competent.

He's not registered as such with Gas Safe. He says of course he is - he's installed hundreds of them.

The cylinder instructions (inlet group was in accompanying pack with cylinder): The instruction sheet with the valve group itself lists the presence of a check valve within the assembly, but does not have a schematic:

extract from the Gledhill cylinder manual explaining the combined inlet group

Yes, very low voltage, two wires, negligible current. Pretty much any old wire will work - speaker wire is fine, or doorbell wire if you only need a short piece. Anything suitable for mains voltages is overkill but will work. If you use a very long piece of thin wire (say, 50 yards of...

I required that he move it, yes. That he moved it to a dangerous location cannot in any way be blamed on me. I didn't make it a safety issue, the incompetent plumber my builder chose made it a safety issue. If it is actually perfectly fine where it was, why does the manufacturer not list...

Indeed - in fact you can remove right of access to your property from any individual for any reason (with a few exceptions - you can't deny access to the VAT man for example). However, the customer has a duty to allow access to the contractor for the duration of the contract, so the...

It's on a JCT building contract. There is a right for the customer to terminate the entire contract if the contractor "is so incompetent or careless that the work is of an unacceptable standard", but there's no right of veto over subcontractors, or equivalent right to eject just one...

Absolutely - the plumber was incompetent, but the builder appointed an incompetent and insufficiently qualified plumber. Also, most of the real problems were not actually the plumber being incompetent, they were the builder not recognising or believing that - had the plumber been my direct...

Since the CM907 runs off batteries, the sensor isn't going to be at a high voltage (though the relay obviously might be if your boiler is 240V switching) The sensor is just a weatherproofed temperature-dependant resistor. I used (low spec) speaker wire to connect one to my CM67 (it doesn't...

The decorators (appointed by the builder) start work today...

Thank you for your opinion. In your view then, next time a 'professional' installs an unvented cylinder with no expansion vessel and relief valves with nothing on the vent port, how should I react? Is saying "Thank you very much. Gosh I do admire you skilled tradesman chaps - I would...

Err, no. It's like blaming Tesco's horsemeat on the person that put horsemeat in the mix. Is that so very wrong? And in fact, has a Tescos boss been arrested? No. Have abattoir operatives been arrested? Yes. The builder was doing what some people in the forum think should be the natural...