Tankless Water Heater Installation Cost 2026
Tankless water heater installation cost runs $1,200 to $5,600 in 2026, with most homeowners paying $2,400 to $5,400 for a complete, professionally installed job. A direct electric swap is the budget end; a gas conversion needing a bigger gas line and new venting is the expensive end.
The number that surprises most homeowners is the labor side. The unit itself is only 30 to 50 percent of the total tankless water heater installation cost; venting, gas line work, electrical upgrades, permits, and old-equipment removal make up the rest. That is why two quotes for the same heater can differ by thousands of dollars: the house, not the box, drives the final number. Home Depot cites a national average of about $4,300 installed.
Cost at a Glance
Here is the full picture of tankless water heater installation cost in one view.
| Item | 2026 Cost |
|---|---|
| Total installed, typical range | $1,200 to $5,600 |
| What most homeowners pay | $2,400 to $5,400 |
| Gas tankless, installed | $2,100 to $5,600 |
| Electric tankless, installed | $1,400 to $3,000 |
| Direct swap (same fuel, same spot) | $1,200 to $2,800 |
| Conversion from storage tank | $2,000 to $4,500 |
| Permits | $50 to $200 |
Tankless Water Heater Installation Cost by Fuel Type
Fuel type is the first fork in the road. Gas costs more to install but delivers far more hot water at once, making it the most common whole-house choice; its tankless water heater installation cost reflects larger venting and gas line work. Electric installs more simply but pulls enormous current.
| Fuel Type | Installed Cost | Unit Only | Typical Flow Rate |
|---|---|---|---|
| Natural gas | $2,100 to $5,600 | $1,500 to $2,600 | 9 to 11+ GPM |
| Electric | $1,400 to $3,000 | $600 to $1,000 | 2 to 7 GPM |
| Propane | $1,600 to $4,500 | $1,000 to $2,000 | Similar to gas |
Estimators put the tankless water heater installation cost at roughly $3,293 to $3,859 for gas versus $1,642 to $1,925 for electric. The catch with electric: whole-house models can draw around 120 amps, so a dedicated 240 volt circuit ($250 to $900) is standard, and many homes need a panel upgrade ($850 to $1,700, or $1,200 to $2,500 when 100 amp service must jump to 200 amps).
Condensing vs Non-Condensing Units
A condensing unit rates 0.92 to 0.96 efficiency, with a secondary heat exchanger that recovers exhaust heat for 20 to 30 percent better efficiency than a non-condensing model at 0.80 to 0.85. The condensing premium adds roughly $500 to $1,000 to the tankless water heater installation cost, which high-use homes typically earn back in 3 to 5 years. Non-condensing is the sensible pick mainly for low-use or vacation homes, where total tankless installation cost matters more than lifetime efficiency.
Tankless Unit Prices by Brand and Size
Brand matters less than the installer and the venting plan, but unit price sets the floor of your quote. These 2026 figures cover residential gas condensing units, the most popular category, and the unit typically makes up only a third to half of your total tankless water heater installation cost.
| Brand | Unit Only | Installed | Max Flow | Warranty |
|---|---|---|---|---|
| Rinnai | $1,100 to $2,600 | $3,200 to $5,000 | Up to 11 GPM | 15 years heat exchanger |
| Navien | $1,000 to $2,200 | $2,800 to $4,500 | Up to 11.2 GPM | 15 years; recirc pump built in on A2 models |
| Rheem | $800 to $2,000 | $2,500 to $4,200 | Up to 9.5 GPM | 12 years; widely stocked at Home Depot |
| Noritz | $900 to $2,400 | $2,600 to $4,800 | Up to 11.1 GPM | 12 years (EZ series 25 years) |
The Noritz EZ series is built for tank swaps: its flexible vent fits the old tank’s B-vent, cutting conversion venting costs substantially.
Installation Scenarios: Swap vs Full Conversion
What your home already has matters more than brand name for the average tankless water heater installation cost: reusing the gas line, venting, and mounting location quotes far less than starting from scratch.
| Scenario | 2026 Installed Cost | What It Involves |
|---|---|---|
| Direct swap, tankless to tankless | $1,200 to $2,800 | Same fuel and location; existing gas line, venting, and mounting reused |
| Conversion from storage tank, same fuel | $2,000 to $4,500 | Wall mounting, new venting, gas line sizing check, condensate routing, old tank removal |
| Full conversion (fuel change or major upgrades) | $2,500 to $7,000+ | Gas line upsizing, new vent route, electrical panel work, possible relocation |
Older homes are the wildcard: Chicago installers report that pre-1970 homes often add $1,500 to $3,000 in labor for infrastructure upgrades. Coming from a conventional tank? Our water heater installation cost guide lays out the tank side of the comparison.
What Drives the Price Up or Down
Gas Line Sizing
A storage tank uses a half inch gas line at about 40,000 BTU; a whole-home tankless unit needs 150,000 to 199,000 BTU, usually requiring a 3/4 inch line to the meter. Upsizing or running a new gas line costs $350 to $2,000, typically $300 to $800, the most common reason gas conversions blow past estimates.
Venting
Replacing existing gas exhaust vents runs $100 to $600, while first-time venting on a conversion costs $500 to $1,500. Condensing units vent through inexpensive PVC; non-condensing units require stainless steel venting that can cost more than the pipe run itself.
Electrical and Panel Work
Even gas units need power, and electric units need a dedicated 240 volt circuit at $250 to $900. If the panel cannot handle the load, expect $850 to $1,700 for an upgrade, or $1,200 to $2,500 where service must jump from 100 to 200 amps. Your tankless water heater installation cost quote should always spell out whether panel work is included.
Labor, Permits, and Install Time
Installation labor runs $600 to $2,500 for a job that typically takes 3 to 10 hours. Permits typically cost $50 to $200, and old-unit disposal often runs about $250 bundled into the bid.
Extras and Add-On Costs
Beyond the core tankless water heater installation cost, these add-ons show up on real quotes.
| Add-On | 2026 Cost |
|---|---|
| Gas line upsize or new run | $350 to $2,000 |
| Dedicated electrical circuit | $250 to $900 |
| Panel upgrade | $850 to $1,700 ($1,200 to $2,500 for 100 to 200 amps) |
| First-time venting | $500 to $1,500 |
| Hot water recirculation pump | $500+ (built in on Navien A2 models) |
A recirculation pump is the most popular comfort add-on, keeping hot water at the tap instead of running it down the drain. If your quote lists the price of tankless water heater installed with options, this is usually the line item worth adding.
Sizing Your Tankless Unit by GPM
An undersized tankless unit is a cold shower waiting to happen. Add up everything that might run at once: the tankless water heater installation cost you budget should match that number, not the cheapest unit on the shelf.
| Simultaneous Demand | Target Flow Rate |
|---|---|
| 1 shower | 4 to 5 GPM |
| 2 showers | 6 to 7 GPM |
| 2 showers + washing machine | 8 to 9 GPM |
| Large family, 3 baths | 9 to 11 GPM |
| Heavy use, 12+ GPM | 12+ GPM (may need two units) |
Fixture benchmarks: shower 1.5 to 2.5 GPM, kitchen faucet 1 to 2, bathroom faucet 0.5 to 1.5, dishwasher 1 to 2.5, washing machine 1.5 to 3, filling tub 3 to 5 or more. Size for the coldest winter month, not summer: take your desired 120 degrees and subtract incoming groundwater temperature. Northern homes facing a 70 degree rise need about 40 percent more BTU capacity than warm-climate homes at a 50 degree rise.
Gas units at 150,000 to 200,000 BTU handle roughly 5 to 8 GPM at a high rise; electric units manage about 2 to 4 GPM. The tankless water heater installation cost at the large end can mean two units plumbed in parallel.
Tank vs Tankless: Should You Switch?
Endless hot water is the headline selling point, but lifespan, running cost, and the price tag matter too. Weigh the tankless water heater installation cost below against a conventional tank.
| Factor | Conventional Tank | Tankless |
|---|---|---|
| Installed cost | $600 to $3,100 (Homewyse avg $1,586 to $1,843) | $1,200 to $5,600 |
| Lifespan | 8 to 15 years | 15 to 20+ years with maintenance |
| Annual running cost | Higher (standby heat loss) | About $100 per year less (DOE) |
| Hot water supply | Limited by tank capacity | Endless, but limited flow (2 to 5 GPM typical) |
| Install complexity | Standard swap | Often needs venting, gas line, or panel upgrades |
| Space | Floor-standing tank | Wall-mounted, compact |
| Maintenance | Anode rod, periodic draining | Annual descaling ($100 to $300) |
The switch pays best when your household regularly runs out of hot water or you plan to own the home for 15 years or more. For the tank baseline see our water heater installation cost guide, and for a different upgrade path entirely see our solar water heater cost guide.
Energy Savings and Payback
The Department of Energy estimates a tankless unit saves about $100 per year on water heating (roughly $272 per year versus $388 for a tank), and ENERGY STAR puts a certified gas unit at about $95 per year for a family of four. One lifetime analysis at around $127 per year over 20 years returns about $2,540, enough to cover the install premium and the tank replacement you avoid around year 10 or 12. That is why a higher tankless water heater installation cost can still be the cheaper lifetime choice. The tradeoff: limited simultaneous flow can mean two units for big households.
Tax Credits and Rebates in 2026
Ignore old articles: the federal 25C credit is $0 for tankless water heaters installed in 2026. The Energy Efficient Home Improvement Credit (30 percent, capped at $600 for tankless) was terminated for equipment placed in service after December 31, 2025; 2025 installs can still be claimed on the 2025 return. No federal credit reduces your tankless water heater installation cost in 2026, and if a contractor proposal shows one as a 2026 offset, the proposal is wrong.
State programs typically offer $200 to $1,000 on qualifying high-efficiency equipment, and utility rebates run $100 to $500, up to $1,300 from some gas utilities. Check your state energy office and utility, or the DSIRE database, before buying.
Maintenance: Budget for Annual Descaling
Tankless units need annual descaling, especially with hard water; skipping it can cut lifespan by two or more years. A professional visit costs $100 to $300 per year; a DIY kit runs about $50. Treat maintenance as part of the real tankless water heater installation cost of ownership: it is what turns a 12 year unit into a 20 year unit.
How to Hire a Pro and Get Accurate Quotes
Quotes for the same house can differ by thousands, so always get 3 local quotes from licensed plumbers or HVAC contractors with tankless experience. Ask each bidder to itemize the unit, venting, gas line or electrical work, permits, and old-unit disposal separately, and confirm whether the price of tankless water heater installed in your quote includes the condensate drain route for condensing models. While the plumber is on site, bundling small jobs can save real money: adding a garbage disposal installation or a sump pump installation to the same visit cuts the trip charge.
Finally, be wary of any bid that looks too good; it usually means venting or gas line work was quietly left out. Get your tankless water heater installation cost in writing, with every line item named.
FAQ
Quick answers to the most common tankless questions.
How much does a tankless water heater cost installed?
Most homeowners pay $2,400 to $5,400, within a typical tankless water heater installation cost range of $1,200 to $5,600. Gas runs $2,100 to $5,600 installed, electric $1,400 to $3,000.
Is a tankless water heater worth it?
It is worth it if your household runs out of hot water or you will own the home 15 years or more: about 20 years of life versus 8 to 12 for a tank, plus roughly $100 per year in energy savings. For small households that may sell soon, payback is marginal.
What size tankless water heater do I need?
Add up simultaneous use: a shower uses about 2.5 GPM, a washer about 3, a dishwasher about 2. Most two to three bath homes need 6 to 8 GPM; four or more baths need 9 to 11+ GPM, and each step up in size typically adds $1,000 to $2,000 to your tankless water heater installation cost. Always size for the coldest winter groundwater temperature.
Gas or electric tankless: which is cheaper?
Electric is cheaper upfront ($1,400 to $3,000 tankless installation cost versus $2,100 to $5,600 for gas), but electric delivers lower flow and may need a $1,200 to $2,500 panel upgrade, while gas gives 9 to 11+ GPM and better long-run savings.
How long does installation take?
A straightforward swap usually takes a day or less, around 3 to 10 hours of labor, though the tankless water heater installation cost quote for a complex home may include extra days for gas line upsizing, new venting, or panel work.
Is there a federal tax credit for tankless water heaters in 2026?
No. The Section 25C credit ended for units placed in service after December 31, 2025, so nothing reduces your tankless water heater installation cost at the federal level for 2026 installs. Check state programs ($200 to $1,000) and utility rebates ($100 to $500, sometimes up to $1,300) instead.
Tankless water heater installation cost in 2026 lands between $1,200 and $5,600, with most complete jobs at $2,400 to $5,400. Size the unit to your real flow, budget for venting and gas line work on conversions, and skip any quote that ignores them. All prices in this guide are estimates based on 2026 national contractor pricing. Every home is different, so get 3 local quotes before you sign anything.
For TheFixPrice, I’m Mike Reynolds. I research contractor pricing across the US so homeowners can budget with real numbers before they call a pro.
