Packaged low pressure boilers

means a packaged boiler that is:

(1) A steam boiler designed to operate at or below a steam pressure of 15 psig;

(2) A hot water boiler designed to operate at or below a water pressure of 160 psig and a temperature of 250oF; or

(3) A boiler that is designed to be capable of supplying either steam or hot water, and designed to operate under the conditions in paragraphs (1) and (2) of this definition.