If your water heater is on its way out, you want a straight number, not a range so wide it is useless. Here is what actually drives the cost in 2026.
A standard 40 to 50 gallon gas tank, swapped like for like, usually lands between $1,400 and $1,800 installed on Long Island. That price covers the new tank, the permit, disposal of the old unit, and code items that get missed on cheaper quotes, like a proper expansion tank and updated venting.
A few things push the price higher:
- Switching from gas to electric, or the other way around, because that means new wiring or new gas piping, not just a tank swap.
- A tankless unit instead of a tank. Tankless units cost more up front, often $3,500 to $5,500 installed, but they take up less space and do not run out of hot water.
- A tank in a hard-to-reach spot, like an attic or a finished basement with the unit boxed behind a wall.
- Code updates your old installation never had, which is common in older Long Island homes that have not touched the water heater since the 1990s.
A few things that should not add to the price, but sometimes do on a lowball quote: a permit (skipping it is not a discount, it is a liability), an expansion tank where your town requires one, and honest disposal of the old unit.
The real question is not what a new water heater costs, it is whether you need one yet. A tank that is leaking from the bottom or is past 10 to 12 years old is not worth repairing. A tank that just needs a new thermocouple or heating element is often a $150 to $300 repair, not a $1,500 replacement.
If you are not sure which one you have, that is a five-minute question on the phone, and it is one we answer for free before anything gets scheduled.