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Filling loop on Isar HE30 boiler?

The pressure has fallen on my boiler to around 0.5- as yet no problems with hot water or heating but would like to re-pressurise system. The manual says do this through the filling loop- is this the DHW inlet valve???

steph
September 2009
look for a braided hose will have valves either side

tim
September 2009

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