Tankless Water Heater Cost Calculator (2026)
By Dan Whitlock, Home Projects Editor · Updated August 2026
A tankless (on-demand) water heater costs more than a tank to install but rewards you with endless hot water, a 20+ year lifespan, and a reclaimed closet. In 2026 the installed price runs about $1,200 to $5,500. The single biggest swing is whether you go gas or electric, and, for gas, whether your existing gas line and venting can handle the higher demand. Build your estimate below.
Tankless water heater cost at a glance
Installed 2026 prices by unit type, before regional adjustments. The gas-line, venting, or panel upgrade a unit may need is the biggest hidden swing.
| Unit type | Typical installed cost |
|---|---|
| Electric point-of-use (single fixture) | $350 – $1,000 |
| Electric whole-home | $1,200 – $2,800 |
| Gas non-condensing | $1,800 – $3,800 |
| Gas condensing (most efficient) | $2,400 – $5,000 |
| Add: gas-line + venting upgrade | +$500 – $1,500 |
| Add: electrical panel / circuit upgrade | +$600 – $2,000 |
Not sure what capacity you need before you price it? Use our tankless water heater sizing guide (GPM by household)
Estimate your cost
Unit plus standard install labor.
Tankless units draw more gas or amperage than a tank.
Labor and materials swing with local cost of living.
Estimated tankless water heater cost
$2,550 – $5,450
Most homeowners pay around $3,575
Cost breakdown
- Gas condensing (most efficient)$3,300
- Permit, descaling kit & old-unit removal$275
Planning estimate based on 2026 national price data, not a quote. Get local quotes to confirm.
What drives your tankless water heater cost
- Gas vs. electric: gas units heat more water per minute but often need a larger gas line and new venting.
- Flow rate (GPM): sizing for two showers at once costs more than a single-bathroom unit.
- Condensing vs. non-condensing: condensing units cost more up front but use cheaper PVC venting and less fuel.
- Panel capacity: whole-home electric tankless can require a 150–200A service upgrade.
- Hard water: annual descaling protects the warranty; a softener may be recommended.
Ready for real numbers?
A calculator gets you the fair range. Local quotes confirm it for your exact home. Comparing 2–3 written quotes from licensed local pros is the single best way to avoid overpaying: ask each for the same scope in writing so the numbers are comparable.
Ways to save
- Choose electric if your household is small and your panel has spare capacity; it skips gas-line work.
- Non-condensing gas is cheaper up front if your venting can accommodate it.
- Ask whether your existing 3/4" gas line is adequate before assuming an upgrade.
- Point-of-use units are a cheap fix for one far-away fixture, not a whole-home solution.
Hire it out, or do it yourself?
Leave this one to a proGas tankless installs are plumber-and-electrician territory. Most whole-home gas units require a 3/4" to 1" gas line, and many homes are on 1/2" and need an upgrade that involves cutting into the line and pulling a permit. Venting is a second issue: condensing units use PVC, non-condensing units need stainless or Category III venting, and routing that through the house adds time and money. A botched gas connection or improper venting is a carbon monoxide problem, not a leaky-faucet problem.
Electric whole-home tankless units draw 150–200 amps of 240V, often more than an older home's entire panel capacity. The install typically means a dedicated double-pole breaker and heavy-gauge wire run, and frequently a panel upgrade on top of that. Point-of-use electric units (under a single sink) are genuinely DIY-able for a homeowner comfortable with a circuit breaker, but whole-home electric is not.
The practical move is to get two or three quotes before the old tank dies rather than after. Ask each plumber whether your existing gas line and venting can handle the new unit without upgrades; that answer will split $2,600 quotes from $4,500 quotes on the same heater. And if you are in a hard-water area, ask about a softener at the same time: mineral buildup is the number-one cause of premature heat-exchanger failure, and adding it after means a second round of labor.
Helpful products
Taking the DIY route, or doing part of the job yourself? These are the product categories most people buy for this project. As an Amazon Associate we may earn from qualifying purchases, and it never changes your price.
Frequently asked questions
How much does a tankless water heater cost installed in 2026?
About $1,200–$5,500. A gas condensing whole-home unit averages ~$3,100 installed; an electric whole-home unit averages ~$1,800. Gas-line or panel upgrades add $500–$2,000.
Is gas or electric tankless cheaper?
Electric is usually cheaper to install because there is no venting or gas line, but it may need an electrical service upgrade in older homes. Gas costs more to install but delivers a higher flow rate for larger households.
Do tankless water heaters really save money?
They cut standby energy loss and last about twice as long as a tank, so lifetime cost is often lower, but the up-front premium means the payback is best when you stay in the home 8+ years.
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Price ranges cross-referenced against these 2026 cost guides and contractor databases:
Hard water is the top killer of tankless heat exchangers. In a hard-water area, the softener should be budgeted alongside the heater, not as an afterthought when the first descaling is due.
Water Softener cost from $1,000 →