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  1. R

    Megaflow over-full - need to reduce pressure

    First EVER post - so please play nicely. Professionally installed Megaflo 250l unvented system 12 months ago in conjunction with loft conversion. Gauge (on red expansion tank) used to read around 1 bar. Suddenly, and with no alterations to the system (no changes whatsoever) it's circa 2.8 bar...
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