Calculator
Tankless Water Heater Cost Calculator
Price a tankless water heater including the upgrades a conversion usually triggers.
Verified August 2026
Select a state to re-price the estimate with local labor and material costs.
Estimated installed cost
$3,841 – $5,456
- Unit
- $1,540
- Supply and venting upgrades
- $1,550
- Labor and permit
- $1,275
Estimates only. Local pricing, site conditions and code requirements change the real number.
The formula
Cost = unit price + gas/electrical upgrade + venting + labor + permit
The unit is rarely the expensive part. Converting from a tank usually means a larger gas line, new stainless venting or a 120-amp electrical upgrade.
Worked example
A gas tankless conversion with a new gas line and venting typically runs $3,600 to $5,400 installed.
Frequently asked questions
How much does a tankless water heater cost installed?
Most gas tankless installations run $2,800 to $6,000 in 2026. Straight swaps of an existing tankless unit are cheaper; first-time conversions are the expensive case.
Is tankless worth it?
Tankless units last about twice as long as tanks and cut standby losses, but the payback on a first-time conversion is usually 10+ years unless hot water use is heavy.
Sources
Sources & verification
Last verified August 2026. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing — they are not quotes. Permit rules change; confirm with the building department before starting work.