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Thanks guys. I'll get him back. He IS CORGI-registered and has done all the paperwork....just doesn't seem arsed about this issue. Just one clarification.... one of you suggested the dead leg could be where we removed an immersion tank (which we did) and one of you suggested it would be in...

Boiler: Vaillant Ecotec 837 condensing boiler Just had the above boiler installed and I have a slight problem. Every time I turn on a COLD water tap and then turn it off, the boiler pump comes on for 15-20 secs. This happens every time cold water is drawn from the mains.....i.e. toilet...

Installer said nowt. will check with him this morning what's a 'dead leg' and how do I check it? :D

Ok. Just had a Vaillant 837 installed and all seems well, except that when I run a cold tap, the boiler pump starts up. Not the burner, just the pump. Can't understand this as surely a cold tap should have no effect on the boiler? Any ideas whether this is normal. seems pretty inefficient to...