How Much Does Tankless Water Heater Installation Cost in 2026?

Three major cost researchers agree on this one: HomeAdvisor ($2,638), Angi ($2,629), and Fixr ($2,811) all put the average tankless installation at roughly $2,600, with most projects landing between $1,400 and $3,900. The spread inside that range comes down to two choices — gas versus electric, and whether you're converting from a tank for the first time.

Tankless Installation Cost at a Glance

HomeAdvisor ($2,638), Angi ($2,629), and Fixr ($2,811) all land within $200 of each other on the national average — call it about $2,600 installed, with most projects between $1,400 and $3,900. Installed figures above follow HomeGuide and Fixr, whose gas numbers include the venting and gas-line work a real conversion requires.

Gas vs. Electric: Where the Money Goes

Electric units are cheaper twice over: the unit costs less ($600–$1,000 vs. $1,500–$2,600 for gas, per HomeGuide) and installation is simpler — no venting, no gas line. Gas units heat more water faster and cost less to run in most markets, but the install adds $700–$2,600 in venting and fuel-line work. If your electrical panel needs upgrading to feed a whole-home electric unit, that advantage narrows fast (panel upgrades run $850–$1,700).

Converting From a Tank? Budget for the Add-Ons

A like-for-like tankless swap skips most of this table — which is why replacing an existing tankless unit ($600–$2,000 per Fixr) costs so much less than a first-time conversion.

Cost by Flow Rate

Size to your peak simultaneous demand — shower plus dishwasher plus laundry — not your total daily use. Undersized units are the most common tankless complaint.

The Federal Tax Credit

ENERGY STAR-certified gas tankless units qualify for a federal credit of 30% of project cost up to $600 under the Inflation Reduction Act's Section 25C (per Forbes Home). On a $2,600 install, that's real money — keep your receipts and confirm the model's certification before you buy.

Factors That Affect Cost

• Fuel type — gas installs run $700–$2,600 more than electric
• First conversion vs. replacement — gas line, venting, and panel work only hit once
• Flow rate and brand tier — 8+ GPM and premium brands (Rinnai, Takagi) price highest
• Local labor and permits — plumber rates $45–$150/hr; permits $50–$500
• Whole-home vs. point-of-use — single-fixture units start around $400 installed

Tankless vs. Tank: The Long Game

A tankless unit costs more upfront than a standard tank but lasts roughly twice as long — 20+ years versus 8–12 — and heats water only when you use it. Whether the math works for your household depends on usage, fuel prices, and how long you'll stay in the home. Our tankless installation page covers the decision in depth, and the water heater replacement cost guide shows the tank-side numbers for comparison.