Hundreds of Jerusalem residents found themselves with no hot water or with water flowing through their apartments after the solar panels on their roofs froze over, a city plumber said Tuesday. The temperature in Jerusalem dipped to freezing for the third consecutive night Monday, although meteorologists forecast that the mercury would rise starting Wednesday. Plumber Yonah Mishaan, who received some 40 emergency calls on Tuesday alone, said there was a run on hardware stores for the NIS 10-20 copper caps for the heaters due to the unusually cold weather. He added that the problem stemmed from the pressure getting too high and causing leaks. "This happens once in a blue moon," Mishaan said. "It has really been a crazy few days." In the meantime, he urged residents to leave a faucet dripping in order to avoid such an occurrence.