he he the best I am certainly not. After reading your description, I tried to draw conclusions and as you can see my analysis turned out to be accurate in this case.
I am an ordinary Kowalski, a user of a Vaillant combi boiler (an old model with an open combustion chamber), in which I learned practice, gaining my knowledge.
You haven't even written what kind of stove you have, but I'm not a service technician, so I won't recommend anything specific, because I just don't know it.
Yes, I learned from my boiler and took it apart, thanks to which I got to know its construction, principle of operation and, at the same time, I descaled the whole, which gave the boiler a new life, and I am richer with new experiences and knowledge.
There are some analogies to my Vaillant but generally it's blindfolding and at your own risk.
Based on my Vaillant, I can say that after years it is definitely worth descaling the entire water section, because deposits accumulate over time, which reduce heat transfer, which meant dismantling the boiler and cleaning all elements.
However, this also involves some risk, which is why laymen are advised against "burying" themselves, because the boiler can be lost or hurt itself, especially since not everyone has technical, analytical sense and the ability to do manual activities.
In general, it is worth servicing boilers, because e.g. cleaning the heat exchanger on the fire side ensures flue gas patency and minimizes the risk of soiling. That is why I am a supporter of cyclical reviews, so that the equipment flies, and not call the service until something goes down. And most of the problems are due to the lack of service and periodic inspections, cleaning, etc.
