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OP The manufacturers' installation instructions will give the answer to the issue of the correct orientation of the tappings. I'd be surprised if they did not specify tappings uppermost on a horizontal unvented.

^^ https://assets.publishing.service.gov.uk/media/66f6c6ce3b919067bb4828cc/ADG_with_2024_amendments.pdf sections 3.40, 3.41 , 3.42 OK, I'll amend my post to stating that G3 qualification (and scheme membership) is required to notify under one of self-certify schemes. Other...

"To reach World Heat Cylinders (manufacturers of unvented hot water systems) for technical support, sales, or spares, you can call them on 0161 343 8610"* (AI result) I think your installer has stuffed it and seriously doubt that he holds the mandatory G3 qualification. *EDIT THIS THE WRONG...

Photos would help.

You face forward (towards the door) on a squatter. A proper Indian toilet does not have a toilet paper dispenser like in the picture above. You use water from a little cup, and there is a strict etiquette about which hand and which finger does what! All a bit disconcerting to the first-time...

No problem whatsoever with draining the heating coil of an indirect cylinder and leaving it empty and unused..

To me too. Google "tap reviver".

Note OP's location..

For example.

Escalation to gas leak detection may not be required. There may be an issue an experienced plumber can spot in five minutes if he's given the space to look around.

There may well be, (and probably is) an existing internal stoptap, just no-one has looked for it yet. I think you need to organise a plumber visit with a carer present to calm your mother while the plumber goes about his business.

Yes, simple as.

This is very common in the world of plumbing. The word "designer" usually means "overpriced c**P" that looks flash online/in the catalogue but is actually pretty rubbish." Well-engineered or just plain bog standard is generally miles better.

Posting the resolution of a thread is always welcome!

Cutting off 1/2" of the pipe and pushing it back on may work.

And a zone valve on each hydraulic circuit, HW +Zone1 +Zone2

Must it be Hive? I'm sure there are cheaper internet-enabled switches to operate your relay.

Durapipe ?

Could have been a touch neater, but any builder /carpenter/kitchen fitter who understands the need to leave ready and unobstructed access under the boiler to valves, filling loop, condensate trap and for other service and repair procedures is a jewel. The worst thing a visually perfect...