Today I’m going to show you how we replace two 12-year-old 40-gallon natural gas tank water heaters with a brand-new 199K BTU Navien tankless water heater. The Navien will take the place of both of the original water heaters with room to spare. The biggest thing that drew our customer to the Navien was the efficiency. Also, with the tankless heater, he could use the extra space for storage. To see the process, watch my latest video.