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I have a Vaillant Geyser Premium Turbo water heater, running on propane. It works fine when running flat out, or with no cold water added to the mixer, e.g. at the shower. But if you want to start adding cold water to the mixer - if you add too much (thereby starving the heater of the cold supply ) it cuts out. It seems unreasonably sensitive to the change in water pressure as I have pretty good mains pressure. It has always been like this from new, and nothing obviously wrong with the installation, no leaks, blockages etc.

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You need an "anti scald" shower valve .

Posted on Dec 28, 2010

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