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The Energy Star-rated EZ98-DV and EZ111-DV (Energy Factor: 0.97) are high-efficiency, condensing, tankless water heaters. The EZ98-DV has a maximum input of 180,000 Btuh and a maximum flow rate of 9.8 gallons per minute (gpm), making it generally suitable for homes with up to three baths.

The J-IIS variable refrigerant flow (VRF) technology is designed for smaller residential, multi-housing, and light commercial uses with equipment available in 3- and 4-ton sizes.

Bob and Tim are at lunch after tuning up an oil burner. When they arrived at the job the home was cold and the oil burner was burning erratically if burning at all. They gave the system a tune-up, started the furnace, and decided to take a lunch break while the furnace heated the house. Then they were going back to do a combustion check on the furnace to make sure that it was set up for the best combustion.

At the 2017 AHR Expo in Las Vegas, several manufacturers showed off VR capabilities in their booths and explained how the technology is now being used for

These high-efficiency systems feature inverter-driven variable capacity technology, which dynamically adjusts capacity and airflow, unlike systems that simply turn on or off. Air circulates more precisely and quietly, maximizing comfort while reducing energy consumption.