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Thanks to both of you! It sounds like it's not a big problem then. I'll top up the system when it's cold and keep monitoring for a while to make sure that the engineer's fix has definately worked. Many thanks indeed! :D

Sorry, I'm a newbie but just wondered if anyone had some thoughts on this. My Vaillant Ecotec 831 boiler was installed a year ago. In the summer it needed topping up once or twice and over winter when the heating was on it was falling from 1.1 to 0.4 bar over the space of a month. Three...