Tankless Water Heater Installation Cost Calculator
Tankless water heaters cost more to install than tanks, mostly because of gas line, venting or electrical upgrades. Choose a unit type and the upgrades your home needs.
Most homeowners pay $3,600 to $6,400 for a gas condensing tankless.
Your estimate
- Materials and labor
- Add-ons
- Permit
National installed prices, materials and labor included. Your local quotes may differ.
Tankless water heater installation cost by option
Installed totals, with standard conditions and permit included.
| Option | Typical total |
|---|---|
| Electric whole-house tankless | $1,900 to $3,900 |
| Gas non-condensing tankless | $2,600 to $4,900 |
| Gas condensing tankless | $3,600 to $6,400 |
What drives the price
- Gas supplyTankless gas units need a larger gas line than most tanks, and upsizing it is the most common hidden cost.
- VentingCondensing models vent through PVC, which is cheaper to run. Non-condensing models need stainless steel venting.
- Electric capacityWhole-house electric tankless units draw a lot of power and often need a panel upgrade.
- Flow rateUnits are sized by how many fixtures run at once. Larger households need higher-capacity units.
How this estimate works
The calculator starts from the installed price range for the type you pick, then adds any extras you tick and typical permit. The headline number is the midpoint of your range. Low-end prices fit simple jobs in lower-cost areas. High-end prices fit complex jobs, premium brands and high-cost metros.
Get at least three written quotes before you hire. Ask each contractor to list materials, labor, permits and disposal separately so you can compare them line by line. Read how we build our ranges.
Common questions
How long do tankless water heaters last?
Many last 20 years or more with annual descaling, roughly twice as long as a tank.
Do tankless heaters save money?
They use less energy than tanks because they don't keep water hot around the clock. Payback depends on your usage and fuel prices.
Can I install a tankless heater myself?
Gas line, venting and electrical work typically require licensed trades and a permit.
Sources and method
Price ranges are national installed estimates maintained by the HouseMath editorial team and last reviewed September 2026. For the labor side of the job, see the U.S. Bureau of Labor Statistics Occupational Employment and Wage Statistics data for plumbers, pipefitters, and steamfitters (SOC 47-2152), which shows how trade wages differ by state.