For residential, and some commercial customers, some utility companies continue offering rebates for eligible energy savings 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 that 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.