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Bellows in a cistern??????

The pressures MUST be balanced, so the PRV should be on the mains before the combi, otherwise your cold has a higher pressure than the hot at the shower, this will cause a problem with the thermostatic mixer and is why you are getting fluctuations and noise, tell your builder to move it so that...

Work is scarce down here as well, as we have been swamped by Eastern Europeans who work cheaper than we can afford too, but I am not up rooting myself just to find work

Nick5050, I wish you luck you seem to have a sensible head on your shoulders, but always remember, you work to live, you don't live to work, life and how you enjoy it is the most important, we only get one chance, so don't be forced into moving from a place that you like and are happy, just to...

Tony, you changed your career late in life, you worked for the BBC before doing what you do now, so what makes it ok for you and not for others. I don't know if you know this Tony, but life is for living, its not all about work you know, if the guy comes from Manchester, has his roots there and...

For me to know

That has got to be the dumbest question ever Tony

That is what is wrong with the UK market, the sales people just spew nonsense and sell gimmicks to cover up the problem, the problem needs to be dealt with, stop the corrosion = no magnetite, no need for magnetic filters, think of it logically, the chemical companies sell the powerflush machines...

You just say that you are thinking of fitting a magnabooster 2, you don't say why, obviously you have been suckered in by the sales gimmicks and marketing people, there is never a reason to fit one of these, they are just a nice gimmick to make money, if you have magnetite in your system this is...

So you have 2 vents over your cold water storage tank, not good having your heating vent over your cold water storage tank, if it pumps over heating water will be emptied into the tank from where you use the water for bathing and brushing your teeth, if you only have one vent over the cold water...

did you use to have this problem before you had the two radiators replaced

the air has to be coming from somewhere, it cannot just generate from the water, once water has released its free oxygen it has no more to give, air means either it is been drawn in, or corrosion is taking place in the system which is causing the air build up, as your system is open vented you...

Standards will say whoever are the majority sitting on the BSI at the time, unfortunately chemical companies are filling these spaces, so everything is biased to them, things will change, there are better ways without chemicals to protect heating systems, quality of the initial fill water been...

yes, just flush and de-aerate, air is what causes corrosion get rid of the air = No Corrosion

Corrosion resistant screws are what are normally used, bolts are not used for fixing down pans, it appears from the photos that your screws are corroded this is what may have led to the pan becoming loose and wobbling, or the plugs in the ground are not gripping sufficiently

You either have ingress of air somewhere or major corrosion occurring in the system which is causing the air, either way there is something wrong with your system and you should get it looked at

Cold flush then a hot flush, no need for chemicals on a new installation, just a gimmick to sell product, ensure that the system is designed well at that de-aeration is adequate, no air, no corrosion its that simple

No it is not, it is a test point for monitoring correct functioning of the downstream check valve http://www.rwc.co.uk/Public/backflow/flowdcv.pdf

The OP said they were heating pipes, these do not come under water regulations, if they were all UFH systems would be illegal wouldn't they

The best advice is get a local reputable plumber in to sort it for you, as you have said you do not intend touching it yourself, there are a few things that could cause what you describe, but without been on site to diagnose the problem, any suggestions to recitty the issue would just be guess work