Our water heater/tank broke after ~12yrs, and we wanted to find out if a tankless water heater would be an option for us (saves so much space!) Called our current provider at the time and they said it wouldn't be possible due to lack of drainage capabilities in the room where it would be situated -- and moving the tank to an area of our basement where there is drainage would require the gas line to be extended through the ceiling. A second opinion from a smaller company confirmed the same. Called Cozy World (who had installed our new A/C a couple of years ago) and they found a solution for the drainage by connecting it underneath our stairs with the lines for our washer/dryer which are just down the hall. Cost was reasonable given that we were paying a premium price to go tankless, and the team stayed all day to make sure the installation went well -- a lot of commitment to craftsmanship. I even asked them to adjust the external gas line that they'd installed so that it ran closer to the wall of our house and they willingly obliged.