Rinnai Corp. has posted a billboard on California’s 405 freeway that features an LED display with a running daily total of the dollars wasted in California each day by homes and businesses heating their water with inefficient water tanks. According to an annual estimated cost from the Gas Appliance Manufacturers Association and Energy Factor from the May 2007 Consumers Directory of Certified Efficiency Ratings, the 13 million single-family homes in California waste about $5.1 million daily heating water with tank-type water heaters, equaling about $1.9 billion a year, or more than $3,500 a minute.