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They have. It's about the most primitive control system you can get. They don't do it now because it's rubbish, only slightly more advanced than an open fire in the middle of the hut with a hole in the roof. Someone (maybe on Dragons' Den) said they get loads of enthusiastic young...

1) No. That's what happens with old heating systems (look up sundial c-plan); they're still rubbish. Better to start the system earlier at a lower, non-scalding temperature (optimum start). I've heard that thermal shock (sudden heating) can damage boilers on a multiple boiler...

I think there's so many disadvantages to your idea that it would it would take months to list them all. It appears (to you) to be a good idea, but you do not have the specialist knowledge or experience to anticipate the many disadvantages. Look up 'mean radiant temperature', for a start...

It used to be 82degC (180 degF) flow 71 (160 degF) degC return; now it's usually 70 degC F, 50 degC R. I can't see any reason why you'd want to circulate water at 80 degC. It wouldn't damage a radiator. If you had the heating flowing continuously during the hours of occupation, and...

True, it's the only way to test it. If it then leaks, it isn't a fault with the valve, it's due to the gunge in the water. A PRV manufacturer (National Vulcan, ISTR) used to have a leaflet in their sales blurb about a DHW calorifier/cylinder, that had over-heated. The control valve on the...

No reason why you couldn't use it indoors, but I'm fairly certain they do big uninsulated pipes.

Why not PEX, they do preinsulated. Rehau & Wirsbo are the major manufacturers ISTR.

I would. Forseeable and avoidable. Leak tested? Pressure tested? Yeah, sure. But since they've tidied up the evidence, it may take some effort to prove.

Besides the PRV, it could be; a leak into the (vented?) HW cylinder; a leak under the ground floor; a leak from the boiler heat exchanger, with the water going into the condensate drain.

It's probably a leak. You really need to find it and fix it, it will be corroding all your radiators, the sludge (corrosion products) will block the waterways through the rads and the pipes and it will cause hotspots in the boiler heat exchanger, causing it to perforate. When you have to...

:lol: I should have read JD's post. :oops: And it's well below the capacity recommended for most shower pumps.

The black marks on the hot water cylinder label (3rd post, 1st picture) suggest (if I've understood it correctly) that it's a combination cylinder. If so, the cold water supply to the cylinder is on top of the cylinder, with a mains water supply to a float valve. That would be why his hot water...

Most likely to be a waste of breath, in my experience. You'll know when you've found it, but I'd hope not.

Not leaks in the roof space, but leaks from the heating system, typically under the ground floor or inside the hot water cylinder, where they won't be noticed. This would cause fresh water to enter the heating system. The fresh water has dissolved air in it. Any dissolved oxygen corrodes...

One of the causes of air-locking is hydrogen, produced by electrolysis of the water. This will usually only happen if the water is acidic, the usual cause of that is flux residues. However, if the system has been power flushed, they'd usually use a chemical cleaner which has an acid in it...

There are some chemicals in it, markers, that can be detected by an HMRC roadside test, even if the red dye has been removed. If they catch you using red diesel, you'll be in line for all manner of unpleasantness. There's probably more tests in rural areas to catch naughty farmers using...

It isn't. The Aerejc stops that.

Yes, if they did the soldering with active flux and didn't flush the residues out of the heating system, it could generate hydrogen; check whether the 'air' is hydrogen, as above. Any automatic air vents on the system? Search Google images for a picture if you don't know what they look...

I'm fairly certain that any fitting connected to a potable water system, which includes DHW, should be WRAS approved. I doubt that a towel rail would be approved, for the reasons given above. And no I didn't, but I'm sure I'd have been asked for them if I'd done more domestic plumbing. The...

The pipe has to be insulated. And the towel rail is usually several parallel large pipes, so the flow rate through any pipe will be very small.