I am annoyed this morning.   Once again my washing-up water - the first hot water I have used in the kitchen today - is running warm then cold then hot. And the cold water is running warm then cold.   This probably means that the last people, who renovated the house, did not insulate the water pipes where they pass through the zone where there is underfloor heating, and the water standing in the pipes has heated up.   A small annoyance due to lack of sweat a