Tankless water heater prices installed usually range from $1,200 to $10,000, with many standard replacements costing about $4,500. Fuel type, household hot-water demand, venting, gas-line or electrical upgrades, and local labor rates drive the final quote.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Installed electric unit | $1,200 | $2,400 | $4,000 | Existing wiring and panel can support the unit |
| Installed gas unit | $2,500 | $4,500 | $7,500 | Standard venting and gas supply |
| Complex gas conversion | $5,000 | $7,500 | $10,000+ | May include new venting, gas line, or electrical work |
| Equipment only | $400 | $1,300 | $3,000 | Price varies by fuel, capacity, and brand |
Installed Prices for Gas and Electric Tankless Heaters
A basic electric tankless installation commonly costs $1,200-$4,000, while a gas model with ordinary venting generally costs $2,500-$7,500. A typical gas replacement averages around $4,500 when the home already has a suitable gas line and vent route. Premium condensing units and complicated conversions can exceed $10,000.
Equipment alone is often $400-$1,500 for a standard electric model and $800-$2,500 for a residential gas model. Larger homes may need a higher-capacity unit or two heaters; those configurations can bring equipment above $3,000 before installation. Assumptions: U.S. residential installation, standard-quality equipment, accessible work area, and no major code corrections. Replacing a compatible gas unit is usually less expensive than converting a tank system or changing fuel type.
What Gas Lines, Venting, and Labor Add to the Quote
Quotes combine equipment with installation work and any required site changes. The following ranges are common planning estimates, not fixed national rates.
| Quote item | Typical price | What changes the charge |
|---|---|---|
| Heater equipment | $400-$2,500 | Fuel, capacity, and condensing design |
| Installation labor | $600-$2,000 | Replacement versus new location |
| Gas-line work | $300-$1,500 | Pipe diameter, length, and capacity |
| Venting and termination | $300-$1,200 | Route, wall or roof penetration, and vent material |
| Electrical, permits, disposal | $150-$900 | Outlet or circuit needs, local fees, old-unit removal |
Electric models may require a dedicated circuit or panel upgrade, which can add $500-$2,500 or more. Gas installations may need condensate drainage for a condensing model. Ask for equipment, labor, venting, permits, and disposal as separate quote lines.
How Capacity, Gas-Pipe Diameter, and Vent Length Change Price
Capacity is commonly stated in gallons per minute (GPM). A unit around 5-7 GPM may suit a smaller household with modest simultaneous use; homes seeking 8-11 GPM for multiple showers and fixtures may need a more powerful model or multiple units. Higher capacity can add several hundred to more than $1,500 to equipment costs.
Gas supply is another major variable. A long run, undersized pipe, or demand above the existing line’s capacity can require a larger-diameter line and additional labor. Venting costs rise when the heater is far from an exterior wall or needs a long, complex route. Moving a heater to a different room may add $1,000-$3,000 for plumbing, vent, and electrical changes. Confirm the unit’s required GPM and gas input against actual household demand before comparing equipment prices.
Ways to Lower a Tankless Installation Quote
Keeping the new heater near the current water-heater location can avoid long pipe runs and extensive vent relocation. If the existing gas line, electrical supply, and venting meet the new unit’s specifications, ask the installer to verify that before pricing upgrades. A compatible replacement generally costs less than a new location or fuel conversion.
Compare at least three itemized quotes with the same fuel type, capacity, venting scope, warranty, and permit allowance. Choosing a standard model rather than a premium control package may save $300-$1,000. Do not cut costs by skipping required permits or undersizing the heater; either can create code, performance, or warranty problems. Controlling location and matching capacity to demand are often more effective savings than choosing the cheapest unit.
Regional Labor Rates Shift Tankless Heater Pricing
Labor and permit costs can make installed prices roughly 10%-25% higher in expensive metro areas than in lower-cost rural markets. High-cost coastal cities may also require more extensive inspections or code-related work. In lower-cost regions, straightforward replacements may come in 10%-15% below a national planning estimate, though equipment pricing is less region-dependent.
These percentages are broad comparisons, not guaranteed discounts. Local gas, plumbing, and electrical requirements matter more than state averages for a particular home. A quote should identify permit fees and any anticipated code upgrades rather than burying them in one installation charge. Compare local bids for the same equipment and scope instead of relying on a national average alone.
How Long Installation Takes and What Labor Covers
A direct replacement often takes 4-8 hours for a two-person crew, while a new vent route, gas-line work, or heater relocation can extend the job to one or two days. Plumbing or HVAC labor commonly bills at about $75-$150 per hour, with licensed electrical work sometimes priced similarly or higher. Some contractors quote a project price instead of hourly labor.
The labor charge can include disconnecting the old heater, mounting the new unit, connecting water and fuel, testing operation, and checking for leaks. Ask whether startup, haul-away, and final inspection coordination are included. Longer installation time usually reflects added system changes, not just the heater’s mounting.
Common Extras for Condensate, Recirculation, and Removal
Condensing gas models can need a condensate drain and neutralizer, typically adding $100-$400 when the drain is nearby. A recirculation pump or compatible control can cost about $200-$800 installed, depending on whether the home already has a return line. Removing and disposing of an old tank may add $100-$300 if it is not included in the base quote.
Emergency or same-day service may add $150-$500, and difficult access can raise labor charges. Ask which accessories are required by the selected heater and which are optional convenience upgrades. Separate required code or operating components from optional recirculation and control features.
Tankless Replacement Versus Keeping a Storage-Tank Heater
A standard storage-tank replacement often costs about $1,200-$3,500 installed, while a tankless replacement typically costs more upfront, especially if venting or utility upgrades are needed. A tankless system can save space and provide continuous hot water within its rated capacity, but savings on energy bills depend on household use, fuel prices, and the old heater’s efficiency.
For a working tank heater, compare the cost of a repair—often $150-$800 for common valve, thermostat, or component work—with full replacement. If a tank is leaking, repair may not be practical. Tankless units also need periodic flushing in hard-water areas; service may cost roughly $150-$300. Compare the full installed quote and expected upkeep, not equipment prices alone.