As of April 16th, 2015, the manufacturers of water heaters must comply with a new energy efficiency standard set by the Department of Energy called the NAECA National Appliance Energy Conservation Act. The good news for consumers is that these new standards will save energy. The bad news is that many of the high-efficiency appliances that comply with this act, notably gas water heaters and boilers, are not like your mom and dad’s water heaters; they are complex appliances with circuit...