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Richard - you're a smart guy! You even spot my mistakes as well as my plumbers... Yes I meant I could raise the CWS...which to my eye isn't really the problem but the original plumber said it might help to get more head on the CW (which you seem to agree with?) The vents are before and...

Gotchya, thanks Richard. I think I can raise my HWS by about two feet so I might just be alright. My current install has vents in what looks like might be an anti-gravity loop but Salamander said take them out - it says never use vents in the installation guide - which seems odd if the anti...

Thanks Richard - that makes sense and is useful. Does the lack of CW head explain the inability to pump HW? If so, before doing major surgery might it be worth raising the CWS a few inches (can't do more).

Lucky me, half way through an MFI installation of a negative head shower and they go bust. The originally plumber was having troubles, but now no-one seems to know what to do. Can anyone help? - CWS level with the pump, in the loft - HWS about 2 metre below the pump, in spare bedroom -...