AHRI 1500:2014

This Standard applies to gas and oil-fired steam and hot water packaged boilers with inputs equal to or greater than 300 MBh, that is: a) A steam boiler designed to operate at or below a steam pressure of 15 psig; or b) A hot water boiler designed to operate at or below a water pressure of 160 psig and a temperature of 250 °F; or c) A boiler that is designed to be capable of supplying either steam or hot water, and designed to operate under the conditions in paragraphs (a) and (b) of this scope.