After the intense European heatwave beginning in late May fuelled a surge in imports of Chinese air conditioners, drought across the continent is now driving unexpected overseas demand for Chinese-made water-saving hardware.In Yiwu – a city in eastern China’s Zhejiang province known as the world’s small-goods capital – Liu Junming has spent more than two decades exporting kitchen and bathroom hardware. He said exports of taps and showerheads had risen unusually sharply this summer.Taps bound...