The international airports in Pennsylvania are Lehigh International Airport at Allentown, Erie International Airport at Erie, Harrisburg International Airport at Harrisburg, Philadelphia International Airport at Philadelphia,
Electric Plenum Heaters. A plenum heater is an electric resistance heating device that is installed in the plenum, which is the spot in the ductwork system where ducting and furnace join. Air is heated as it flows across electric elements and then is distributed through the existing ductwork.
Marine Water Heater. A marine water heater is a heating device used in boats and ships for heating water as well as spaces. Powered by either electricity or propane, a marine water heater is a way to provide instant and required amount of hot water for tasks such as washing-up, personal hygiene, and shower, besides cooking etc.