Welcome to Just Answer!You and your neighbor already have demonstrated more knowledge of this issue than the vast majority of people in the paving and road construction business...The reason you have not gotten an answer so far is that soil studies will be required to go beyond what you already know.. and any advice without soil and drainage studies will be nothing but wild guesses, and not in your best interests.You can most likely do what you have in mind and be better off than 99% of projects in the area however. Beyond that you need to contact a civil engineer, who will order soils analysis (not cost effective on a project of this type in most cases)... then he will give you his advice, and that advice will likely not be much better informed than your own unless there are unusual soil conditions that I do not expect.Stay in touch if you need to. Since this is not an answer to your question I am posting it as an info request only.Phil
I do not see how the info has anything to do with my Baxi Luna question. Is this really the info you intended to send to me?
Correct me if I am wrong, but I believe there is only one fan and it is above the primary heat exchanger at the top of the unit. It runs for both heating and DHW. I only have this sound when DHW is called for. Is there a second fan that only runs when DHW is demanded?
Thanks for the info on white vinegar and stethoscope.
I had thought it was a valve somewhere, even one in a sink or bath, so I turned them on one at time but the screaching never quite. As for a valve in the Baxi, it almost must be the Diverter Valve as it is the only one that operates when the DHW is called for. How do I use a mechanics stethoscope? I assume I drain the system and run it up the pipe. what am I looking for? With the system off (no DHW demand) the value will be in the "quit" position.
Hello again, to use a mechanics stethoscope, fit both ear pieces, then press the metal probe to the part of the boiler you wish to listen to... it will become obvious which part is making the noise.Take your time... that pays off, it takes a while to make sense of these sorts of things.. your testing approach so far is right on target... you just need to be using a stethoscope to pin point the source
You can also sometimes feel the noise vibration with your fingers.. give that try also.Phil