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The Zappi has far and away the better open PEN fault protection system of the two, the Hypervolt uses a crude voltage sensing system I believe, so will false alarm if the supply voltage is on the high side and may not always detect a true open PEN fault either. I don't have a Zappi, or any connection with them, but did recently install an Eddi and have to say I'm very impressed with both the engineering and the firmware. It seems that Myenergi have put a great deal of effort into making their products as versatile and easy to use as possible.