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Taps rocking back and forth is the main problem with a flimsy sink. If you plumb in solid copper rather than flexis it gives a big improvement. More trouble, but unlike flexis lasts indefinitely as well.

It could be 0.3 or 0.5 bar if the if the highest point of the system is less than 3m (or 5m) above the boiler, and the boiler cutout pressure switch is set low enough. 1 bar is a convenient covering figure, which is OK for most installations.

Also because the boiler is usually on the ground floor, and need to ensure the highest rads are under positive pressure.

Yes, good point

Most likely you have Y-plan, possibly W-plan as it's all fairly old. I meant gravity through the cylinder coil, olde-worlde system, which you haven't got. That's why I said primary. With your non-pressurised HW cylinder the flow to the taps (secondary side) must be by gravity. If you change...

What system controls do you have at present? Any motorised valves? If it's gravity HW (primary), pumped CH, and you change the boiler, worth improving the system, several options available on the plumbing, before getting into Nest, Tado etc

You can't pressurise your existing HW cylinder. If you want mains-pressure HW it would need a different cylinder. If you get a new boiler it could be a heat-only direct replacement, or you could have a pressurised type, with accumulator, and remove the F/E tank in the loft. But no advantage in...

And make the cold feed up and under, to avoid convection warming the F/E tank, encouraging algae growth.

I wouldn't use a flexi, rigid pipe looks (and lasts) much better. There's some excuse for flexis to kitchen sink taps, which can be hard to get to, but even then if it's DIY so time spent isn't a problem, it's worth making the effort to use rigid. That will last indefinitely and adds rigidity to...

We'll just have to wait and see (and hope). Maybe the current lot will fall and another lot take over, but without Reza Pahlavi.

As I understand it, Reza Pahlavi doesn't say he wants to be a new Shah, but to act as an intermediary till a more representative government takes over. Be great if that happens!

What is international law? Who imposes it and what are the penalties? It hasn't done anything to deter Putin, Xi, Assad and Maduro to name a few, some of whom have sat on panels deciding when it has been violated.

On sludge digestion plants on sewage works, using biogas in the boilers, we used minimum return temperature control, 60°C IIRC. Because of sulphur compounds in the biogas, but hadn't heard of it on natural gas.

4 draw 4 drawer

If it's a modern condensing boiler I don't see why corrosion would be a problem, it's designed for condensation, which is improved by generously sized rads allowing low water temperature. But worth checking with the boiler manufacturer.

That's largely true, but we are where we are now. Maybe the Shah would not have been deposed if he had acted differently, and reined in SAVAK. But for the Iranian people who wanted him gone, it's a case of be careful what you wish for.

Why not? Does it matter?

Or deny

I don't know why everybody doesn't include it in their details. It's often useful as background to queries, problems etc.

Where do you live? Might be relevant to some of your posts.