How much does tankless water heater installation cost?
A tankless water heater typically costs $1,000–$3,500 installed, including the unit ($500–$1,500) and labor. Upgrading gas lines, venting, or switching from a tank can push a job to $4,000–$6,000+.
Ranges are typical planning guides — actual price varies by region, access, materials and your local pro. Always get a written quote.
| Scenario | Typical cost | Notes |
|---|---|---|
| Gas unit, straight replacement | $1,000–$2,500 | Existing gas & venting reused |
| Electric tankless install | $1,500–$3,000 | May need panel/circuit work |
| Tank-to-tankless conversion | $2,500–$4,500 | New gas line + venting |
| Gas line or venting upgrade | +$500–$1,500 | Larger line, stainless vent |
What affects the price
Gas vs electric
Gas tankless units heat more water but need a larger gas line and special venting. Electric units are simpler to vent but may need a panel upgrade for the heavy load.
Converting from a tank
Swapping a tank for tankless is the priciest path because the gas line, venting, and mounting all change — not a like-for-like swap.
The unit itself
Unit price ($500–$1,500) sits on top of labor. Higher flow rates (GPM) and condensing models cost more but run cheaper.
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How much does tankless water heater installation cost?
Usually $1,000–$3,500 installed for a gas unit reusing existing gas and venting. Converting from a tank, or upgrading the gas line and vent, can reach $4,000–$6,000+.
Is a tankless water heater worth the extra install cost?
Over time, yes for many homes — they last 20+ years and cut standby energy loss, but the higher upfront cost means the payback is slow if your hot-water use is low.
Can I replace a tank with tankless myself?
It is not recommended. Gas sizing, venting, and combustion air must meet code, and gas work is best left to a licensed plumber or gas fitter for safety.