Product Description This bundle includes the FVI12-NG Tankless water heater, 2.5 to 3 Stainless steel adapter, and the 3 Horizontal vent kit. FVI12-NG Tankless Water Heater The Eccotemp FVI12-NG tankless water heater is a natural gas fired, indoor tankless water heater designed for small to medium hot water production where you need more than one hot water application at the same time. The Eccotemp FVI12-LP tankless water heater is perfect for vacation cabins, cottages, and smaller homes. Eccotemp FVI12-NG tankless water heater comes with a horizontal stainless steel vent kit, ready to install. The Eccotemp FVI12-NGs 120 volt UL listed power cord powers the internal exhaust fan and digital display. It only pulls about 2 watts idle and 1.07 Amps during operation, making it ideal when energy conservation is paramount. 2.5 to 3 Stainless steel adapter This stainless steel adapter can be used with the Eccotemp FVI12 series taking it from a 2.5 to a standard 3 vent system. Total length is 6. Note, you may need to purchase a straight pipe piece with backflow preventer to ensure that freezing air does not come back through the vent pipe. Eccotemp Horizontal Vent Kit 3 3 single walled Horizontal Stainless Steel Z-Vent Wall Hung Water Heater Vent Kit for Eccotemp 40HI-LP and 40HI-NG (indoor) models. This vent kit is supplied with all the necessary components for a quick and seamless installation. It includes the following pieces: (1) Termination Hood with backflow preventer (1) 3 x 90 Degree Elbow (1) 3 x 1' Pipe (1) 3 Wall Thimble (1) 3 Appliance Adapter Made of AL-294C stainless steel. This is Category II/III and UL approved.