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10 sq. Ft. heating surface - VERIFIED ANSWERSFor the purpose of rating boiler horsepower for an engineers licence only, how many square feet of boiler surface shall be equivalent to one boiler horsepower on a boiler? boilers operating at a steam or other vapor pressure of 15 psig. or less or a hot water or other liquid boiler in which the pressure does not exceed160 psig or a temperature of 250 degrees F. - VERIFIED ANSWERSwhat is meant by the term low pressure boiler? high a...