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I have a 10 year old Vaillant boiler which is in the garage. When it was fitted unfortunately the filling loop is in the house upstairs near the hot water tank. We have a small pressure drop which builds up over time and I have had to keep topping up the pressure every month - nothing major but...

I am a newbie and looking through the site some of my questions have been answered so thanks. Some still remain. Firstly though, had an extension done a few years back and ever since, whenever we had the hot water heated through the Vaillant Ecomax VU226E condensing boiler, the rads in the...