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Thanks to you both. It does fit, & has all the serial numbers to match; BUT that flange corner has to unscrew to allow in the bare electrical connection, that used to screw directly in at the top right corner. A quick fudge, I hope.

No. House name. We used to live there. And there are a few bears around the place - mostly for the pupils!

Parts Center seems an excellent firm, polite and helpful. I've ordered a part, 24 hours delivery. We'll see if it fits. My thanks again. It seems that someone in the past must have fitted this VP6 ZE pump that originally was intended for the VCW 282 or VCW 280 boiler, as you said. But I've...

Thank you both. I've finally found the boiler number label -!!! Vaillant "W + P". Type VKN 12. Reg 5C 002/95. Product no. 43 96 (=1996?) I phoned Vaillant, to be told that a "Type F" replacement pump from Germany would be 'European only' - though 50Hz. etc - and would not work. No...

Advice Please: A large firm of plumbers visited, and told me that wandering/failing boiler temperature problems, and occasional pressure dropping, were caused by a failed pump. We still have some heating in the house, but temp drops back after each firing. They discover that my Grundfos VP6...