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Are you in the industry? I'd guess not because a cobbler's children wear no shoes! And your average homeowner doesn't even know what's in their loft, apart from a load of crap that is there to inhibit any work that needs doing! Lol.

Sure keeps a system cleaner. And helps you know of possible leaks that could cause more damage! Jeez the state of most header tanks! Like something from a "how life began" documentary ;)

You'll never get them to admit this is a potential design fault... Or a Friday afternoon boiler!

And no inaccessible compression fittings which is best practice.

I wasn't sure if it was pushfit but I did see that socket in the floor and thought if it was, you could plug it flush to the floor ;)

Yes. That is a test that would show a significant drop.

Yep... As said... Stored hot water needs to prevent legionella.

Are you measuring it with a thermometer or just guessing? 60°C is set on cylinders to prevent legionella but if water is constantly being drawn through and used up then risks are minimal and it can be lowered, but I would say 40 is too low. Recommend blending valve(s) or thermostatic taps.

A medium pressure regulator looks very different to a standard one IME... Have only encountered 2 MPMs in 5 years.

I was going to advise the same. What is the old boiler? Can it be pressurised?

Beat me to it. :)

Going back to when the supply was changed from medium to low pressure... I would have thought that all meters/governors would/should have been changed at the same time! Sounds like a lot of things got missed! And the owner should be seeking some form of compensation - from several parties!

Change the timer to heat the tank at a different hour(s) of the day. This is just a suggestion to rule out potential supply spikes or slumps. You have to stop repeating the same experiment.

What is the actual temperature at a tap? What is the cylinder stat set to? Is your immersion heater on? Do you have a secondary return. Need actual temps because scalding is different to individuals..

Brand? Model?

This is the crux of your issues. You are trying to compare and resolve two completely different worlds... And worlds apart they are. Thank fook IIMBSB :)

I can get off the edge of my seat now then thank fook.

Just chop a bit of the wall out.

Yep or a rubber bung type for internal which will get you lower down.