Water heaters consume 14% to 25% of a home's annual energy use. Choosing the best water heater for your home can be challenging with so many new designs to choose from. Cost and efficiencies vary widely, and the least expensive water heater can be the one that costs the most to run. Your needs and water comsumption level will help determine which system is best for you. Download for answers to common questions about the difference between tank and tankless water heaters, including information about how each type works.