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Hi, Still trying to fit an immersion heater to my Potterton Powermax HE115 Combi boiler. Had a go at the weekend following instructions in the manual that say: "Isolate mains water supply at stop valve on Inlet Control Group and close / turn valve (handle at 90° to valve body) on double...

Hi, I've bought an immersion heater for my Powermax 115 Bolier. This is so that we have hot water when the bolier goes wrong again (which it seems to do on a fairly regular basis). The procedure in the manual seems fine apart from the last step which says: "When refilling: check that...