Thanks to Terry and Tony.
For some others on this thread, it has been a real trial, ducking your punches and persisting through the nastiness. Why are you posting here if it is just to make nothing of people or push them off the forum? {If you have a bad day, change something in your attitude/approach to the job. But don’t take it out on us posters asking for your help.}
Generally, bearing in mind that I am in the category of customer and presumably all of you are in the category of plumbers, I find it real strange that you mostly (not all) go on the accused footing, banging on about trusting the plumber, responding with suspicious put-down questions about how a customer should not know anything but simply get the cheque book.
Phew! I am in another nearby industry (not boilers) and I would never treat our customers like that. Even on the main forum for that other industry, the posters are real helpful to the other engineers and customer-types. Yes, an occasional joke and rib, but also with HELPFUL advice. And in the building industry, most builders are real helpful to customers and advise them etc and then win some work. But the plumbers here – as I say, not all of them and it might just be my bad luck on this one thread – why are you posting here if it is just to shove people away and be nasty? You are wreaking the Forum and the moderators really should get on your cases about it. The people skills are a bit lacking, chaps.
I do not know how it is when the customers call you up but you might get better business and more return customers if you lighten up and try to help them with your great and many experiences instead of protecting what you possibly know.
I called up Baisi (01922-714600) and spoke to someone in their technical advice area (for customers) and he was as pleasant as anything. He suggested switching off the boiler (ie the winter-off-summer switch) and then running the water tap….. no noise. Then switching on the boiler with the tap water running …… and the noise appeared.
His guess verdict? He thought it might be the gas pressure or dirt in venturi area, or in the combustion area (something like that) and recommended a service engineer gave it a clean out and check the pressures etc etc. Great. I know what I’m up to now and even if it turns out the fan/valve/pump needs changing, I have some idea of what costs to expect.
I can call an engineer (he offered two in my area that are familiar with these Baisi boilers) and tell him what I know and he can at least come prepared for this cleaning jobbie, even if something else reveals itself.
So, I got there. But this forum was hard work and not a pleasant experience, chaps. And for all your many experiences, only Terry was able to suggest two boilers as regards upgrading to a condensing boiler.