Thanks to Kayedee for the additional comments. I will look at the suggestion of flushing the system etc
Also, as to Dan-Robinson's comment, from looking at some other postings I think that I have so far been quite lucky that the Ferroli I have has been reasonably reliable and efficient. I did...
Peter, many thanks for the quick and helpful reply. It puts my mind at rest a little. I will turn the temp down to about 70 as you suggest and keep a close eye on it.
This may be a simple question but I am ignorant about these matters. I have a Ferroli condensing boiler about 5/6 yrs old. On the control panel on the boiler the heating temperature is set at about 78 degrees at present. However I have noticed that when the house/room thermostat calls for heat...