How? well, as an experienced engineer, let me explain a little more about boiler efficiency below. All major debit cards accepted. Boilers are more energy-efficient, but they also save money in another way by using a boiler instead of a water heater, you can dispense with a traditional furnace, since you’ll have one device that can do the job of two. If you’d like to learn more about our staff, including how friendly and knowledgeable.