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Are you referring to an "opt. accessory 0020057235 for integrating a circulation pump" which is referred to in teh manual or somethign else?

Thanks to you also. I thought there was a blending valve fitted in the boiler. maybe I am wrong? If not then what do I need and how do I ask someone to fit it correctly.

Thanks for the reply. I am not a plumber - I work in an office. I measured cold in to the boiler >25 l/min and hot out <12 l / min Understand the issue over resistance but surely this could not reduce the flow by more than half (the pipe run between the 2 is less than 1 metre). Both...

I agree with Simon. I have had a 937 now for 4 years and it has always performed badly. I have had vaillant out a number of times and a number of plumbers look at it. Until last week I was given every reason under the sun as to why it was not working - gas pressure, pipe size in the house etc...