Tankless Water Heater Cost: Installed Prices & What Moves Them
A gas whole-home tankless water heater runs $2,800 – $5,800 installed, while an electric whole-house unit lands at $1,400 – $3,200 and a single point-of-use heater at $400 – $1,200. The unit is only part of the bill: venting, gas-line upsizing and labor decide where you land. Here is the full breakdown, plus an estimator for your job.
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| Type | Installed range | What it serves |
|---|---|---|
| Gas, whole-home | $2,800 – $5,800 | The endless-hot-water replacement for a 50 gallon tank |
| Electric, whole-house | $1,400 – $3,200 | Warm-climate homes or modest demand; needs heavy electrical |
| Point-of-use (single fixture) | $400 – $1,200 | Remote bathroom, wet bar, or a slow-to-arrive faucet |
| Condensing gas (premium) | $3,100 – $6,600 | High efficiency, PVC venting; $300 – $800 over non-condensing |
| Line item | Range | When it applies |
|---|---|---|
| Venting (stainless or PVC) | $300 – $1,200 | Sidewall or roof run; condensing units use cheaper PVC |
| Gas line upsizing | $350 – $1,500 | Tankless burns 150k – 199k BTU; many 1/2" lines need 3/4" |
| Condensing upgrade | $300 – $800 | Added over a non-condensing unit of the same output |
| Recirculation pump | $500 – $1,200 | Near-instant hot water at far fixtures |
| Hard-water prefilter or softener loop | $200 – $500 | Protects the heat exchanger from scale |
| Permit & inspection | $50 – $250 | Required in most jurisdictions |
| Brand | Installed range | Note |
|---|---|---|
| Rinnai | $3,000 – $6,000 | Wide gas lineup, condensing and non-condensing |
| Navien | $3,200 – $6,500 | Condensing specialist, built-in recirculation on many models |
| Noritz | $3,000 – $6,200 | Commercial heritage, strong residential gas range |
| Electric (EcoSmart, Stiebel, Rheem) | $1,400 – $3,200 | Unit cost lower, electrical upgrade often the swing item |
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Answer four questions about the fuel, the conversion and your demand to narrow the national range to your job.
What fuel will the tankless unit use?
Why the install costs more than the unit
A gas tankless heater itself runs $700 – $2,000 at retail, yet the installed job lands at $2,800 – $5,800. The gap is the work a tankless conversion demands that a tank swap does not. A whole-home gas unit fires at 150,000 to 199,000 BTU, several times a tank burner, so the existing 1/2 inch gas line frequently has to be upsized to 3/4 inch back toward the meter: $350 – $1,500 depending on the run.
Venting is the other big line. Tankless units vent through dedicated stainless steel (non-condensing) or PVC (condensing), out a sidewall or up through the roof: $300 – $1,200. Condensing models cost $300 – $800 more for the unit but use the cheaper PVC venting and recover more heat, so on longer vent runs the premium narrows. Add the permit, mounting, water connections, and a condensate drain on condensing units, and the labor alone is often a full day.
Gas, electric or point-of-use: which fits
Gas whole-home tankless ($2,800 – $5,800) is the default upgrade from a gas tank: it delivers endless hot water at 5 to 9 gallons per minute and carries a 20-year service life. It is the version most households mean when they price a tankless.
Electric whole-house tankless ($1,400 – $3,200) has a lower unit price, but a whole-home electric model can draw 100 to 150 amps and may force a panel or service upgrade, which is where the real money hides. It works well in warm climates where incoming water is already mild. In cold-inlet northern homes, electric whole-house units struggle to keep up with simultaneous demand.
Point-of-use units ($400 – $1,200) solve one problem: a fixture far from the heater that runs cold for 30 seconds. Mounted under a remote sink or in a guest bath, they pair with your main heater rather than replacing it. If your only complaint is one slow faucet, this is the targeted fix, not a whole-home conversion.
The 10-year math against a tank
First cost favors the tank, and our breakdown of a standard tank replacement cost puts a like-for-like swap at $1,300 – $3,500. Tankless asks $2,800 – $5,800 up front. The case for closing that gap is built over a decade.
A gas tankless unit lasts about 20 years against 8 to 12 for a tank, so over a 20-year horizon you buy one tankless or two tanks. Energy use drops 8 to 34 percent versus a tank, because there is no standby loss reheating 50 gallons all night. Annual descaling, $150 – $250, is the offsetting cost. The pure-dollar payback often runs 8 to 12 years, so the honest pitch is the combination: endless hot water, a smaller footprint, and a longer life, with energy savings that soften the up-front bite rather than erase it.
Sizing by GPM, not gallons
A tank is sized by capacity; a tankless is sized by flow rate (gallons per minute) and temperature rise. Add up the fixtures you run at once: a shower is about 2 GPM, a kitchen faucet 1.5, a tub filler 4. Two showers plus a sink is roughly 5.5 GPM.
Temperature rise is the catch. The unit must lift incoming water to about 120 degrees. In a southern home with 65-degree groundwater, a 55-degree rise is easy. In a northern winter with 40-degree inlet water, the same unit delivers far less flow at the required 80-degree rise. This is why a unit rated 9 GPM on the box may only give 5 GPM in January in Minnesota. Sizing to your coldest month and real simultaneous demand is what separates endless hot water from a lukewarm surprise, and it is the single judgment a good installer earns their fee on.
Hard water and the maintenance you cannot skip
A tankless heat exchanger is a tight passage, and scale from hard water narrows it fast, cutting flow and eventually tripping error codes. Manufacturers require an annual descale or flush, $150 – $250 if you hire it out, to keep the warranty intact. Skip it on hard water and the exchanger can foul in two to three years.
If your home has hard water, a prefilter ($200 – $500) or a whole-house treatment system pays for itself in protected equipment. Our guide to water softener cost covers that side. Either way, budget the annual flush as a real line in the ownership cost; it is the part of tankless ownership most homeowners forget until the unit starts under-delivering.
When gas-line work is the deciding factor
The hidden swing item on most quotes is the gas supply. A tankless burner needs far more fuel than a tank, and many homes have a 1/2 inch branch line that cannot feed it without starving the furnace or range. Upsizing that line to 3/4 inch, sometimes back to the meter or the meter itself, runs $350 – $1,500 and occasionally more on long or buried runs.
If your install also touches the meter or a new appliance run, our gas line installation cost page lays out those numbers. Get the gas sizing checked before you fall for a unit: two quotes for the same heater can differ by $1,000 purely on what each plumber finds at the gas line.
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