If you are comparing tankless vs. tank, the real number to budget is the installed cost—not just the price tag on the box. A tankless water heater typically costs $2,000–$7,000 installed in the U.S., with most whole-house gas projects landing around $3,000–$6,000. The final price depends on fuel type, BTU capacity, venting, gas line or electrical upgrades, permits, and local labor rates.
Tankless Water Heater Cost at a Glance
| Project type | Typical installed cost (USD) |
|---|---|
| Electric point-of-use tankless | $800–$2,500 |
| Electric whole-house tankless | $1,500–$4,500 |
| Gas non-condensing whole-house | $2,000–$5,500 |
| Gas condensing whole-house | $3,000–$7,000 |
| Complex retrofit or high-end system | $7,000–$10,000+ |
Most homeowners should budget $2,500–$5,500 for a straightforward gas whole-house replacement, and more if the home needs a larger gas meter, new venting, or an electrical service upgrade.
Unit-only prices by fuel type and capacity
- Gas tankless water heater: $800–$2,500 for standard models; $1,500–$3,500 for high-efficiency condensing units. Whole-house gas models commonly range from 120,000 to 199,000 BTU/h.
- Electric whole-house tankless: $500–$1,500 for the unit. These often draw 18–36 kW and may require a 200-amp electrical service or dedicated circuits.
- Electric point-of-use tankless: $150–$800 for small under-sink or single-fixture units, typically 3.5–7.5 kW.
- Premium features: Recirculation pumps, smart controls, and stainless-steel venting can add $300–$1,500 or more.
What most U.S. homeowners actually pay
For a 2–3 bathroom home with existing gas service, a whole-house gas tankless installation commonly runs $3,000–$6,000. Electric whole-house installations often run $1,800–$4,500, but a required panel upgrade can push the project to $6,000–$8,000+. Point-of-use electric units for a condo or addition usually cost $1,000–$2,500 installed.
If you are still deciding between tankless and storage-tank equipment, compare styles, sizing, and pros and cons in our guide to tankless water heaters.
Tankless Water Heater Installation Cost Breakdown
| Cost item | Typical range (USD) |
|---|---|
| Tankless unit | $500–$3,500 |
| Professional labor | $600–$2,500 |
| Gas line upgrade | $300–$1,500 |
| Electrical work or panel upgrade | $300–$4,000 |
| Venting materials and labor | $400–$1,500 |
| Condensate management | $150–$500 |
| Permits and inspection | $100–$500 |
| Old unit removal and disposal | $100–$300 |
These ranges are not simply additive. A simple replacement may need only the unit, labor, and a permit, while a complex retrofit can include several upgrades at once.
Labor costs
Licensed labor for a tankless installation usually runs $600–$2,500, depending on access, venting distance, and local rates. Complex retrofits—such as moving gas lines, opening walls, or installing a condensate drain—can exceed $3,000 in labor alone.
Gas line, meter, and electrical service upgrades
Gas tankless units often require a larger gas supply than storage tanks. A gas line upgrade typically costs $300–$1,500; if the meter or regulator must be upgraded, expect $500–$2,000 or more. Electric whole-house tankless models may need a new 240-volt circuit, heavier wiring, or a service panel upgrade costing $1,500–$4,000.
Venting and condensate management
Non-condensing gas tankless units usually need stainless-steel venting, often $500–$1,200 installed. Condensing models can use PVC or CPVC venting, often $400–$1,000, but they produce acidic condensate that must be drained through a neutralizer, adding $150–$500.
Permits, inspection, and old unit removal
Permits and inspections typically cost $100–$500, depending on the jurisdiction. Removing and disposing of an old tank usually adds $100–$300. Never skip permits: unpermitted work can complicate insurance claims and home sales.
Tankless vs. Tank: Upfront Cost and Payback
| Item | Tankless | Storage tank |
|---|---|---|
| Equipment cost | $500–$3,500 | $500–$1,500 |
| Typical installed cost | $2,000–$7,000 | $1,200–$2,500 |
| Expected service life | About 20 years | 8–12 years |
| Standby heat loss | Low | Higher |
| Annual maintenance | $100–$300 | $50–$150 |
Tankless costs more upfront, but it can last roughly twice as long and avoids standby heat loss from a storage tank. That does not guarantee a fast payback. If a tankless premium is $2,000 and it saves $100–$250 per year, simple payback can take 8–20 years before accounting for maintenance and repairs.
For a broader comparison that includes storage tanks and heat-pump water heaters, see our water heater cost guide.
Operating Cost, Efficiency, and U.S. Standards
Look for the Uniform Energy Factor (UEF) on the yellow EnergyGuide label. Gas tankless models commonly range from about 0.82 to 0.96 UEF; condensing units generally deliver the highest efficiency. ENERGY STAR certified models can reduce water-heating energy use compared with standard storage tanks, but actual savings depend on hot-water demand, incoming water temperature, utility rates, and installation type.
In the U.S., gas tankless units should be certified to standards such as ANSI Z21.10.3/CSA 4.3 and listed by a recognized testing agency. Electric models should carry an appropriate UL listing, such as UL 499. Gas installation must also follow local codes and the National Fuel Gas Code (NFPA 54) where adopted.
Energy savings example
If your current gas storage tank costs $500 per year to operate and a tankless model cuts that by 20%, you save about $100 per year. At that rate, a $2,000 price premium takes roughly 20 years to recover—which is why tankless is often chosen for comfort, space, and service life rather than pure energy savings.
Maintenance costs
Budget $100–$300 per year for maintenance. In hard-water areas, descaling is usually recommended every 1–2 years and costs about $150–$300 per service. Skipping maintenance can shorten heat-exchanger life and may affect warranty coverage.
What Affects Your Tankless Water Heater Cost?
Hot-water demand and BTU sizing
Whole-house gas tankless units commonly range from 120,000 to 199,000 BTU/h. A smaller home with one or two bathrooms may work with 120,000–150,000 BTU/h, while a 3-bathroom home with simultaneous showers may need 160,000–199,000 BTU/h and 6–11 GPM flow capacity. Electric whole-house units often require 18–36 kW and a large electrical service.
Climate and incoming water temperature
Colder groundwater in northern states reduces tankless output. A unit rated for a certain flow rate in Florida may deliver less hot water in Minnesota, so sizing must account for the temperature rise needed in your climate.
Installation complexity
Retrofit projects cost more when they require long vent runs