The standards, which were set by the Energy Independence and Security Act (EISA) in 2007 and implemented Sept. 1, 2012, required residential gas hot water boilers to meet a minimum AFUE of 82 percent; gas steam boilers, 80 percent; oil hot water boilers, 84 percent; and oil steam boilers, 82 percent.
In October 2011, Natural Resources Canada (NRCan) published amendment 11 to the Energy Efficiency Regulations in the Canada Gazette part II. Affected products include residential gas, oil, and electric boilers with an input rate of less than 88 kW (300,000 Btuh).
Starting Sept. 1, 2012, all residential boilers must be manufactured to meet new minimum federal efficiency standards. Residential gas hot water boilers must meet 82 percent AFUE; gas steam boilers, 80 percent; oil hot water boilers, 84 percent; and oil steam boilers, 82 percent.