All manufacturers will cover their backs against the unusual, that doesn't mean it wont work, and there's still plan B, fit a PRV.

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Yeah i imagine the shower just wont be covered under the warranty. I am beginning to understand how much my set up sucks.

A pressure reduction valve is looking more and more likely.

I would still connect it up and see what happens, they have flow restrictors that come with them anyway.

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I've ordered a mira built in valve mixer shower and also have a pressure reduction valve which can drop the pressure down to 1 bar for the cold feed. Will be fitting it in the next couple of weeks and will post back on my progress. Fingers crossed.