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No, I used their components. I even tried swapping them out after but to no joy. I'm not sure exactly when the PRV started kicking in, but I'm pretty sure it was when I fitted the shower head.

I have installed a Gainsborough 8.5kw electric shower today. The water flow was fine until I connected the shower hose and head. As soon as those were connected the pressure relief valve kicked in. I reduced the inflow pressure until this stopped however as soon as I raised the shower hose...