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biasi riva ov

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    Replacing Horstmann C17 confused by existing wiring

    Intending to replace elderly in-laws boiler Horstmann C17 timer with a Hive wireless thermostat but confused by the existing wiring. The boiler is a Biasi Riva OV but has a strange setup in that it has no external thermostat and a manual heating/hot water diverter valve (Servowarm valve). Due...
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