For residential, and some commercial customers, some utility companies continue offering rebates for eligible energy-saving products that are purchased and installed. These products include tankless water heaters, different types of home insulation, window replacements, and air/duct sealing. Aaron Swift Plumbing currently installs the Navien Tankless water heaters. We prefer this brand because for one it has a stainless steel heat exchanger that lasts longer than the copper of other brands. Navien also has a flapper inside the damper to alleviate the chance of freezing. These units are 95% energy efficient. A specialist will need to make a home visit to determine exactly which model is needed and if, in fact, a tankless option is best suited for your home or business situation.