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While idly thinking about solar water heating, I started wondering about similar principles applied to a normal open solid fuel fire (with a grate etc., not a stove). I'm sure I'm not thinking of anything that hasn't been thought of decades ago, but Google has been surprisingly unhelpful. I'm...

Hi, I thought the house was cold this morning when I woke up and it seems my system boiler (Ferroli Optimax HE25S) has a problem. Clearly it wasn't heating the house, but rather than showing a fault code, the screen was just blank. I checked the power supply, and also a couple of fuses...