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Thanks Tony. As it looks like running in this configuration isn't dangerous or galactically stupid I'm just going to leave it there and see what it does. Thanks everyone. Let's hope it keeps going.

I plead non est mea culpa - I didn't choose the bloody thing! OK, that makes sense, thank you. Well, the plot is thickening a little bit. I mentioned in my initial post that we use it for CH only, leaving the DHW input and thermostat redundant. This afternoon I elected to try moving the...

Not a whole hell of a lot. The systems uses an external pump that augments the internal boiler pump. The internal pump vibrates smoothly and warms up so I'm assuming the motor at least is working, but I've not done anything to check the efficiency. Ah damn. Is it that obvious? ;) Yep, IT...

Greetings all, I'm looking for some advice and suggestions. I've got a Keston C55, manufactured in 2006, which has been running the house central heating successfully for about seven or eight years. I know that Kestons are at best a dark art and usually the boiler that everyone loves to...