Cheers for looking in here for me, & yes Ive done all facets of this noise reduction mode.. in fact it does afaict, absolutely nothing discernably different. It certainly doesnt make any difference this indoor noisey problem unit, infuriatingly. It perhaps knocks the fan unit noise down a peg, but even this i cannot tell any difference. It is a joke.
You see all noise reference, like for eg the bumf i poured over prior to choosing it/ what is available to a customer with even a db chart is only with reference to one of the 3 units, the one ive only ever read mention makes any noise, is relating to the outside purring fan unit. I have no issue with this. It introduces some low frequency noise yes, via pipes into house (and I'd say this is a bit too noisy in itself during the day, but not in any making you ill big problem capacity; certainly not overnight then its active only at a very low level during these awful noise periods thank christ, so you can only -just- hear it 3 beds away: different in the spare room tho, this unit judt itself makes the room untenable to use as a bedroom, let alone the problem box unit too). The noise reduction, the db chart info, do not have any connection with the very unit which is problematically noisy. I am of the opinion we are hoodwinked, they deliberately do not inform about it, as sales would be affected, rivals' sustems chosen instead. Interestingly.. daiking and mitsubishi i think, -do- mention their indoor unit is liable to make noise, even giving a 28 db figure one GOOD company does.
My beef with Vaillant is that 1) there should be mention of the indoor unit liable to make noise, so to site accordingly could be chosen by both me and primarily a decent installer.. but nothing mentioned. Only the outside unit. I do not sleep outside. And 2) the actual noise it makes, and 3) when it makes its most noise ( exactly the time when you absolutely don't want it to, so it is not conjusive to live near, certainly not to sleep near if it is loud enough to wake you all of 3 bedrooms away.. so it is not fit for purpose in my opinion. Simple as. Without the slightest hesitation of doubt this is true, for this house, a smallish 3 bed cottage.
If i had known it was going to make noise.. I could have sited next to back door, i have the area to, well away from bedrooms. Then, perhaps, but i still think it would be prominent to disturbing at 3 am one reason being the noise is transmitted along the pipes to rads, it could be tolerated within the house. Just. I am of the firm belief though, that it shouldn't be in a small house at all, its just too annoyingly interuptively noisy even in its '2nd gear' lesser normal daytime heating mode tbh.
