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It's got a pretty big downstairs extension and it's detached, so maybe 20kw is about right?

Yes it was filled in - anything on there I should be looking at?

I recently moved in to a property which had had a Vaillant ecoTEC plus 428 boiler installed in early 2013. It is connected to a traditional open vented system, with hot water cylinder in the bathroom upstairs, and cold water storage tank in the loft. In recent months I have been having a few...