Hi, we have a Rexola-biferral Trimatik-MC (manufactured 1991), I have just vented the radiators of air and now I need to top-up the water in the system, two questions; 1. Where is the water inlet (on the back, at the bottom, in the middle?) 2. If so the Viessmann advice on the website is to open 'both' valves, if this is the inlet, it only has one valve at the end of the inlet pipe with a red lever, this is the only one I need to open ? see image here, many thanks
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