A cost guide for US homeowners. Most installations land between $1,200 and $5,500+ depending on fuel type, brand, and what your home already has in place. Pick a fuel type below to see exactly what drives the cost in your scenario.
National average: $2,637 (gas) · $1,850 (electric)Lifespan: 20 years vs 11 for tankEnergy savings: 24 to 34% vs tank
Cost by Fuel Type
Fuel choice is the single biggest cost driver. Switch tabs to see the breakdown.
$2,100–$5,600
Fully installed · $2,637 average
Unit cost
$700–$1,995
Labor
$600–$1,850
Venting
$200–$600
Permit
$50–$250
Natural gas whole-house unit. Most homes can direct-swap a tank heater to gas tankless.
Cost by Installation Scenario
What the project actually involves drives 80% of the variance. A direct swap is half the cost of a full fuel-type conversion.
Scenario
Unit
Labour
Extras
Total Installed
Direct swap, same fuel
Existing gas line and venting compatible
$700–$1,200
$600–$1,200
Permit only
$1,200–$2,800
Conversion, gas to gas
New venting route required
$900–$1,500
$800–$1,500
Venting $200–$600
$1,800–$3,500
Gas line upgrade required
1/2-inch line upsized to 3/4-inch for higher BTU demand
$900–$1,800
$900–$1,850
Gas line $300–$800
$2,500–$5,000
Electric, panel upgrade
200-amp panel needed for whole-house electric
$400–$900
$1,000–$2,000
Panel $1,000–$3,000
$2,500–$5,500
New gas line installation
Switching from oil/electric to gas
$700–$1,995
$1,500–$4,000
Plus utility tap fees
$3,500–$7,000
Our own research from publicly available contractor quotes, manufacturer pricing, and homeowner reports as of April 2026.
Is Tankless Worth It For You?
The question every homeowner has, answered with your own numbers. Estimate annual savings at your fuel rates and how many years it takes to recoup the install cost.
Break-Even Calculator
How many years to recover the upfront cost vs keeping a tank water heater?
US avg: $60–$100/month
Gas avg: $2,637 · Electric: $1,850
What Drives the Cost
Six factors account for nearly all the variance between a $1,500 install and a $7,000 install.
Fuel type
Natural gas, propane, electric, or hybrid heat pump. Each has different unit costs, install requirements, and operating costs.
Brand and BTU
Rinnai and Navien run premium ($900 to $1,995). Rheem and Bosch sit mid-range. EcoSmart leads electric budget tier.
Conversion complexity
Same-fuel direct swap is cheapest. Switching fuel types or upsizing gas lines doubles labour cost.
Venting type
Direct vent simplest. Concentric or sidewall venting through finished walls adds $200 to $600.
Local labour rates
Coastal and metro markets run 25 to 50% higher than rural. California, NY, MA peak; OK, MS, AL bottom.
Permits and inspection
Required in nearly all jurisdictions. $50 to $250 for plumbing and gas permits. Strict areas (CA, NJ) up to $400.
2026 Tax Credit Update
The federal 25C Energy Efficient Home Improvement Credit expired on December 31, 2025. Installations completed before that date can still be claimed on 2025 tax returns filed in 2026. 2026 installations are not eligible. State and utility rebates remain the primary 2026 incentive.
The heat-pump water heater tier of 25C (30%, capped at $2,000) also ended on December 31, 2025, so no federal water heater credit applies to 2026 installs. See our full rebates and incentives guide for state-by-state programmes.
A direct swap with the same fuel type and compatible venting runs $1,200 to $2,800. A full conversion requiring a new gas line, new venting, or an electrical panel upgrade runs $2,500 to $7,000+. The single biggest variable is whether the existing infrastructure (gas line size, electrical capacity, venting route) can support the new tankless unit. Always ask your contractor whether the quote covers a direct swap or a full conversion.