PEACHTREE CITY, Ga., March 3, 2015 /PRNewswire/ -- Rinnai, the number-one selling brand of tankless water heaters in the US and Canada, has signed on as an official sponsor of the ISU World Figure Skating Championships 2015, being held March 25-29 in Shanghai, China. The Championships, which is the largest figure skating event produced by the International Skating Union (ISU), is televised to more than 40 countries, including the United States, Canada and throughout Europe and Asia.