.... and if it isn't then it's very probably just one thing that shouldn't be too expensive for an experienced GSR to repair ... the part would be around a tenner.If the pilot is lit, then as per @Madrab it could be one of several things.
could simply be that the cold water inlet filter has become blockedHiya ye it seems to a got slower not loads but slower than normal
no just turn the water to the heater off open a hot tap till thewater stops, then undo the inlet nut on the heater the filter is in thereDo i need get an engineer out to check that ?
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