Thanks for your replies. Doesn't say Instant anywhere on it, only Baxi Combi 105e.
Pressure is on 1, so within the range recommended.
Bottom line is it a concern or just an annoyance, and can I make it go away?
I have a Baxi combi boiler. For the last couple of months, a few times a day at random times eg middle of night, afternoon, a loud water pressure noise can be heard coming from our boiler which is in the garage.
It only lasts about 3 seconds and sounds similar to the noise that the cold...