At 7:03 am, Salma al Habsi turns the bathroom tap to the blue “C” — cold. She waits. The pipe rattles, and then steaming water gushes out. Curious, she places a kitchen thermometer beneath the stream. The reading shocks her: 47°C.“I can’t wash my face, and I can’t bathe my younger brother without mixing in chilled water from the fridge,” she says....