Tankless solves a real problem and creates a few of its own. Both sides of that are worth hearing before you commit.
The advantages are genuine: no standby losses from keeping forty gallons hot around the clock, hot water that does not run out partway through a house full of back-to-back showers, and a wall-mounted unit that gives back the floor space a tank used to occupy. For the right household, that is a meaningful change, not a marketing line.
The caveats are just as real. Tankless units draw more gas at once than a tank does, which frequently means the existing gas line has to be upsized rather than just reused. Venting is different too — most tankless units vent through a wall with dedicated piping rather than sharing the old tank's flue, so a conversion is rarely a one-for-one swap. And output is finite: a unit sized comfortably for one shower can bog down when a second shower, the dishwasher, and the washing machine all draw at once, which is the complaint people are usually describing when they say tankless "was not what they expected."
Describe what the tank is doing and get matched with a licensed plumber who can tell you what it actually needs.
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