poor heating

Things I’m thinking it might be 1. Historic magnetite blockage at a tee or elbow? How could I find it? Is it likely? (Originally it would have been a vented system with a hot water tank in the airing cupboard but it is pressurised combi now.) 2. One pipe system? Or two pipe...

To be fair this is not a new problem but my wife and I are fed up with feeling chilly when the frosty weather arrives. Prior to 7 years ago we had a lovely warm house heated by a 22 year old boiler that never needed any repairs, never cost anything in routine maintenance, but was almost...

Biasi 24S, about 10 years old. All mechanical parts appear OK (pump, fans, valves etc). Boiler fires on demand of heating or DHW but has become progressively cooler in DHW output, and the heating is now struggling. Flames look good, sys' pressure is OK, but temp' gauge rises to only 30C at about...