An great deal of American homes that are heated with oil also use their oil supply for their domestic hot water systems. Household hot water heaters are enormous users of energy in the colder parts of the country serving American homes, after the residential heating system and air conditioning systems in summer you would be surprised at the number od oil fired hot water heaters located around the country. Depending upon the kind of house and the number of people living in the house, hot water requirements account for more than 20% of total annual energy consumption.
One of the main advantages that an oil fired hot water heater gives is it´s quick recovery time because of the normal delivery temperature it supplies at heat transfer to the water, which is 2x as fast as natural gas and 5x as fast as electricity.
These days free-standing oil fired hot water heaters now use burners with flame retention heads and other new improvements that can greatly enhance the efficiency of the machine. They can be connected to an existing chimney or, in some cases the chimney can be installed through the wall if approval from local authorities has been obtained.