With the rising costs of gas and oil, you may find your heating bills escalating out of control. (In fact, some homeowners in the northern part of the United States spend as much as half of their annual energy bills just on heating and cooling.) But if your boiler is 15 years old or more, you may not have to simply accept this fate. You can actually lower your monthly expenses simply by upgrading to a more energy efficient model. With a new energy efficient boiler, not only will your energy bills be less, but you will also minimize how much energy you waste.