The EZ Tankless Series from Noritz are designed to simplify the replacement of large residential water heaters. These ultra high-efficiency models offer top-mount water connections and multiple venting and location options for faster, easier replacement. They are Energy Star-rated EZ98-DV and EZ111-DV (Energy Factor: 0.97). There are four versions in 180,000 Btu/h and 199,900 Btu/h with flow rates of 9.8 GPM and 11.1 GPM respectively. The larger model is intended for homes with up to four baths.