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Wheee awesome, thanks v much for your help ChrisR. Appreciate that you need to know the model and thanks for your help in determining it, you are indeed correct, it has a black panel with green knobs. We never have hot water but its useful to know that its the diverter valve that contains...

wicked, thanks v much Gasguru, I will check it out.

to Slugbaby: If I had that information, I would have supplied it. I was going to ask another question, that being: how does one identify the model of a Vaillant boiler? There dont appear to be any identifying marks on or in the boiler and (as you would expect) I have have no manual for the...

Hi, Im trying to diagnose a problem with a combi boiler. All my experience to now involves open systems so this is a bit new to me. The boiler works fine for the heating (there are three rads in this studio flat), but it refuses to fire up when I demand hot water. Now, my simple...