Got a tankless quote?
Upload it and we'll check the price against city wage data and flag missing scope like venting upgrades, gas line resizing, or expansion tanks. Free, no email.
Tankless Water Heater Cost by Type and Brand (2026)
Tankless pricing varies by fuel type, BTU output, and condensing vs. non-condensing technology. The table below is unit-only retail. Add $1,000 to $3,500 for installation depending on whether it is a like-for-like swap or a first-time conversion.
| Brand & Model | Type | Output | Unit Price |
|---|---|---|---|
| Rinnai RU160 / RU180 | Gas condensing | 9-10 GPM | $1,400-$2,000 |
| Rinnai RU199 | Gas condensing | 11 GPM | $1,800-$2,500 |
| Navien NPE-240A2 | Gas condensing | 11.2 GPM | $1,900-$2,700 |
| Navien NPE-180A2 | Gas condensing | 8.4 GPM | $1,500-$2,200 |
| Noritz NRC711-DV | Gas condensing | 7.1 GPM | $1,300-$1,900 |
| Noritz NRCB199-DV | Gas condensing combi | 11.1 GPM | $2,400-$3,500 |
| Rheem RTGH-95 | Gas condensing | 9.5 GPM | $1,400-$2,000 |
| A.O. Smith ATI-540H | Gas condensing | 10 GPM | $1,500-$2,200 |
| Bosch Tronic 6000C | Gas non-condensing | 5.4 GPM | $900-$1,400 |
| Stiebel Eltron Tempra 36 | Electric | 6 GPM | $900-$1,400 |
| EcoSmart ECO 27 | Electric | 6 GPM | $700-$1,000 |
| Rheem RTEX-27 | Electric | 5.9 GPM | $700-$1,000 |
Prices reflect Q1 2026 distributor and retail averages from Ferguson, Home Depot Pro, and Supply House. Combi units (Navien NCB and Noritz NRCB) heat both domestic hot water and a hydronic loop and cost $400-$1,000 more than the equivalent water-only model.
Gas vs. Electric Tankless: Recovery Rate and Real-World Output
The biggest spec to understand is GPM at temperature rise. A tankless rated 8 GPM at 35-degree rise will only deliver about 4 GPM at 70-degree rise (the gap between cold groundwater and a hot shower). Cold-climate buyers who size by the headline number end up with cold-shower complaints in February.
- Gas tankless: 6-11 GPM at full load. Mid-range condensing models (Rinnai RU180, Navien NPE-240, Noritz NRC711) cover 2-3 simultaneous fixtures even at 70-degree rise. Most homes north of the I-40 corridor need gas to keep up.
- Electric tankless: 3-8 GPM advertised, but real-world output drops sharply with cold inlet water. A 27 kW electric (Rheem RTEX-27, EcoSmart ECO 27) delivers about 3 GPM at 70-degree rise. Best for warm-climate homes (Florida, Texas Gulf Coast, Southern California) or single-fixture point-of-use applications.
- Why gas usually wins on operating cost: natural gas is roughly $1.20 per therm in 2026, vs. roughly $0.16 per kWh for electric. A gas tankless heating 60 gallons per day costs about $25 per month. Equivalent electric runs $50-$70 unless rates are unusually low.
- Where electric wins: small condos, point-of-use under-sink units, and homes with no existing gas service where running a new line would cost $1,000-$5,000.
Sizing: GPM by Household Size and Simultaneous Fixtures
Manufacturer sizing tools all use the same rule: list every fixture that may run at the same time, sum the GPM, and pick a unit that delivers that flow at your local cold-water inlet temperature.
| Fixture | Typical GPM |
|---|---|
| Low-flow showerhead (post-2010) | 2.0-2.5 |
| Standard shower (older) | 2.5-3.0 |
| Kitchen faucet | 1.5-2.0 |
| Bathroom faucet | 1.0-1.5 |
| Dishwasher | 1.0-1.5 |
| Clothes washer | 1.5-2.5 |
| Tub fill | 4.0 |
Quick rules of thumb. 1-2 person home, 1 bath: 5-7 GPM unit (Rinnai RU130, Noritz NRC66). 3-4 person home, 2 bath: 8-9 GPM (Rinnai RU180, Navien NPE-180). 4-5 person home, 3+ bath: 11 GPM (Rinnai RU199, Navien NPE-240, Noritz NRCB199). For homes with a tub fill above 4 GPM and simultaneous shower demand, the 11 GPM unit is the floor, not the ceiling.
Condensing vs. Non-Condensing Tankless
Condensing tankless units extract a second pass of heat from the exhaust, raising efficiency from about 82% (non-condensing) to 95-98% (condensing). They also vent through PVC or polypropylene instead of stainless steel because the exhaust temperature is much lower.
- Condensing: $300-$700 more for the unit, $200-$500 less for venting (PVC vs. stainless). Required for the 25C federal tax credit (UEF >= 0.95). Better cold-climate efficiency. Industry default in 2026 for new installs and replacements above 180,000 BTU.
- Non-condensing: Cheapest unit cost. Uses stainless steel Category III venting (more expensive, more complex routing). Acceptable for budget retrofits or short vent runs. UEF typically 0.82-0.85, below the 25C credit threshold.
- Concentric vs. twin-pipe venting: Concentric (one pipe inside another) is faster and cleaner-looking but adds $150-$400 to the kit. Twin-pipe is cheaper but requires two roof or wall penetrations.
Federal 25C Tax Credit and Utility Rebates
Gas tankless water heaters that meet ENERGY STAR Most Efficient criteria (UEF >= 0.95 condensing, all major condensing models from Rinnai, Navien, Noritz, Rheem, A.O. Smith) qualify for the federal 25C Energy Efficient Home Improvement Credit. The credit is 30% of project cost (unit + install + venting), capped at $600 per year for water heaters as part of the broader $1,200 building envelope cap.
To claim the credit, save the AHRI certificate, the manufacturer model number, and the contractor invoice. File IRS Form 5695 with your tax return for the year the work was completed (placed-in-service date). The credit is non-refundable, so it reduces tax owed but does not generate a refund beyond your liability.
Many gas utilities (SoCalGas, PG&E, NICOR Gas, Xcel) layer additional rebates of $100-$500 on top of the federal credit. Electric tankless units do not qualify for 25C but a few state programs (Mass Save, NYSERDA) offer small rebates.
Payback Math vs. a Standard Tank
The honest version: tankless does not pay back fast on operating cost alone. A 40-50 gallon gas tank costs $1,000-$3,500 installed and runs about $250-$350 per year for a typical 4-person home. A gas tankless costs $2,500-$6,500 installed and runs about $200-$280 per year. The annual savings is $50-$100. On a $2,500 install premium, simple payback is 25-50 years.
The real reasons people buy tankless: endless hot water (no running out during back-to-back showers), 18-25 year lifespan vs. 8-12 for tank, recovery of 9 cubic feet of utility-room space, and the federal tax credit. If those benefits matter, the cost premium is worth it. If pure operating-cost ROI is the only goal, a high-efficiency tank or heat pump water heater wins.
Hidden Tankless Costs Most Homeowners Miss
- Gas line upsize from 1/2" to 3/4" ($500-$1,500): Most existing tank water heaters run on a 1/2-inch gas line. Tankless units of 180,000-199,000 BTU need a 3/4-inch line, which means rerunning gas pipe from the meter. Often missed on initial estimates.
- Dedicated 240V circuit for electric models ($500-$1,200): A 27 kW electric tankless pulls 113 amps and needs three 40-amp double-pole breakers. Many older panels cannot accommodate this without a service upgrade ($1,500-$3,500 if needed).
- Upgraded venting (PVC concentric or stainless) ($300-$900): Tank flue venting cannot be reused. PVC is required for condensing units, Category III stainless for non-condensing.
- Water-softener pre-filter ($150-$400 plus installation): On hard water, scale builds in the heat exchanger. A whole-home softener or dedicated tankless filter is recommended above 7 grains per gallon hardness.
- Descaling kit (every 1-2 years, $50-$150 DIY or $150-$300 for a service call): Vinegar or commercial descaler flush. Required to keep the manufacturer warranty valid.
- Permit and inspection ($100-$400): Plumbing + mechanical permit for venting. Usually pulled by the plumber.
- Condensate drain ($75-$200): Condensing units produce 1-2 gallons of acidic condensate per day. A neutralizer cartridge ($75-$150) is required by code in many cities.
Tankless Quote Red Flags
- Undersized for household demand. A "good price" on a 7 GPM unit for a 4-bath home guarantees cold-shower complaints. Verify the GPM at your local cold-water inlet temperature, not the headline number.
- No descaling plan in the warranty paperwork. Without scheduled descaling, hard-water scale destroys the heat exchanger in 3-5 years and voids the manufacturer warranty.
- Retrofit without electrical or gas verification. A quote that does not list the gas line size or the electrical circuit is hiding $500-$2,500 of likely change orders.
- "No permit needed" claims. Tankless conversions require a permit in nearly every U.S. jurisdiction. Skipping the permit voids homeowners insurance after a leak, fire, or carbon monoxide event.
- Generic install warranty with no factory certification. Rinnai, Navien, and Noritz all require a factory-certified installer for the long-term warranty (typically 12-15 years on heat exchanger). An "all-brands install" plumber may default the warranty to 5 years.
- Lump-sum quote with no line items. Without unit, labor, gas, venting, electrical, and permit broken out, you cannot compare bids or push back on individual markups.
How to Get the Best Tankless Quote
- Document fuel type and existing setup. Photo the existing water heater nameplate, the gas meter, the electrical panel, and the venting before requesting quotes.
- Calculate simultaneous-fixture demand. List the showers, kitchens, dishwashers, and washing machines that may run at once. Sum the GPM. Add 20% for safety.
- Get 3 itemized quotes. Each should list unit make/model, install labor, gas line work, venting, electrical, permit, and warranty separately.
- Verify factory-certified installer. Ask for the certification number for the brand being installed. Call the manufacturer to confirm.
- Confirm permit and inspection. Plumber should pull a plumbing and a mechanical permit. Permit fee $100-$400.
- Save AHRI certificate and invoice for the tax credit. File IRS Form 5695 for the year the unit is placed in service.
- Schedule annual descaling. Either DIY with a $50-$150 kit or pay a plumber $150-$300 once per year.
Tankless Water Heater FAQ
How much does a tankless water heater cost installed in 2026?
Tankless water heater cost runs $2,500 to $6,500 installed in 2026. The unit alone is $1,200 to $3,500 (gas) or $700 to $2,000 (electric), and labor runs $1,000 to $3,500 depending on whether the install is a like-for-like swap or a tank-to-tankless conversion. Gas-to-tankless conversions add $500 to $1,500 for venting and gas line upsizing.
Is gas or electric tankless better?
Gas tankless wins for whole-home use in cold climates because it produces 6-11 GPM and recovers fast in winter. Electric tankless tops out at 3-8 GPM and cuts in half when groundwater is below 50 degrees, so it is best for one or two fixtures or warm-climate homes. Gas units cost more upfront but operating cost is usually lower than electric on $/MMBtu pricing.
What size tankless water heater do I need?
Size by simultaneous flow. A shower needs 2-2.5 GPM, a kitchen faucet 1.5 GPM, a dishwasher 1.5 GPM. A 2-bath family running shower + kitchen needs roughly 5 GPM at 70-degree rise. That maps to a mid-sized 180,000-199,000 BTU gas unit (Rinnai RU180, Navien NPE-240, Noritz NRC711). 3+ bath homes need 9-11 GPM.
Is a tankless water heater eligible for a tax credit?
Yes. Gas tankless water heaters that meet ENERGY STAR Most Efficient criteria (UEF >= 0.95 condensing) qualify for the federal 25C tax credit at 30% of cost, capped at $600 per year. The credit is non-refundable. Save the AHRI certificate and the contractor invoice and file IRS Form 5695.
How long does a tankless water heater last?
Tankless water heaters last 18-25 years with annual descaling, vs. 8-12 years for a tank. Skipping descaling on hard water (above 7 grains per gallon) can cut lifespan in half and void manufacturer warranties from Rinnai, Navien, and Noritz.
How long does a tankless install take?
A like-for-like tankless replacement takes 4-6 hours. A first-time tank-to-tankless conversion takes 6-10 hours because of new venting, gas line resizing from 1/2-inch to 3/4-inch, and a new dedicated 120V outlet for the controls.
See if your tankless quote is fair
Upload your contractor quote and we'll compare it against city wage data, flag missing scope (venting, gas resize, permits), and tell you the realistic price range for your exact tankless install. Free, no email required.
How We Calculate Tankless Water Heater Costs
Every range on this page is built from three public datasets: Bureau of Labor Statistics Occupational Employment and Wage Statistics for plumbers and pipefitters, Bureau of Economic Analysis Regional Price Parities for material adjustments, and 2026 retail material pricing from Ferguson, Home Depot Pro, and Supply House. Ranges represent the middle 60-70% of typical residential quotes, not the extremes. Read our full methodology.