Unmatched Energy Efficiency: The Rinnai I-Series Plus Water Boiler provides significant energy savings with up to a 96% AFUE rating, making it an excellent choice for cost-conscious professionals Smart Home Compatibility: Featuring Smart Connect technology, these Rinnai Combi Boilers offer Wi-Fi remote access and Bluetooth connectivity through the Rinnai Central App, allowing for convenient monitoring and management Versatile Fuel Options: With Smart Sense Adaptive Gas Valve technology, the I-Series Plus is designed to accommodate natural gas or propane, ensuring compatibility with a wide range of heating setups to meet diverse customer needs Compact and Installation-Friendly Design: The Rinnai Combi Boiler boasts a compact build and easy installation, with 2-inch venting capabilities up to 75 feet for faster setup in multiple zones Advanced Features for Enhanced Performance: Enjoy improved functionality with 4-zone capability, simultaneous delivery of domestic hot water and space heating on all Combi Units, and advanced controls featuring a quick setup screen and improved front panel display