Cost breakdown
| Item | Typical price |
|---|---|
| Gas tankless unit | $1,000 – $1,800 |
| Electric tankless unit | $500 – $1,200 |
| Installation labor | $800 – $2,500 |
| Gas line / venting upgrade | $500 – $1,500 |
| Whole-home gas tankless (installed) | $3,000 – $4,500 |
Estimates only — your exact price depends on your home. Get local quotes for the real number.
What drives the price
- Gas vs electric — the biggest driver.
- Whether gas line / venting needs upgrading
- Unit capacity (GPM)
- Removing the old tank
- Electrical or panel upgrades (electric units)
How to save on tankless water heater installation
- If your gas line and venting already suit a tankless, you skip the priciest part of the job.
- An electric tankless avoids gas-venting costs but may need a panel upgrade — price both.
- Size by peak flow (GPM), not by guesswork; an oversized unit wastes money.
- Ask about manufacturer and utility rebates on high-efficiency models.
How to get an accurate tankless water heater installation quote (and avoid overpaying)
National averages tell you the ballpark; only a quote tells you your number. Here's how to get a fair one:
- Get at least 3 itemized quotes. For the same tankless water heater installation, bids routinely vary 20–40%. Comparing line items (not just the total) is the fastest way to spot padding.
- Check license & insurance. Ask for the contractor's license number and proof of liability + workers' comp. Unlicensed/uninsured bids are cheaper for a reason.
- Beware the extremes. A bid far below the others usually means a missing scope item or a bait price; a high-pressure "today only" quote is a classic overpay trap.
- Get it in writing. The quote should list materials, labor, what's included (removal, permits, cleanup), the timeline, and the warranty.
- Confirm what's not included. Removal/disposal, permits, and code upgrades are the line items that turn a "cheap" bid into the expensive one.
Frequently asked questions
Most installs run $1,500–$4,500 including the unit and labor, averaging ~$3,000. Gas units that need new venting cost the most.
They cost more upfront but last ~20 years (vs 10–12 for tanks), save 10–30% on water heating, and never run out of hot water.
The unit itself is moderate; the cost is in upgrading gas lines and venting to handle the high burner output.
A tankless hot water heater runs $1,500–$4,500 installed including the unit and labor, averaging ~$3,000. Gas models that need new venting or a larger gas line cost the most.
These are national averages — your actual tankless water heater installation price depends on your home, your ZIP, and who you hire. Get up to 3 real quotes and stop guessing.
What would this cost at your house?
Tell us your ZIP and project — local pros send real pricing.
We share your details with up to 3 local pros — not the whole internet. No spam, no obligation.
Sources & methodology
Our price ranges are compiled and cross-checked against published cost studies, industry datasets, and current contractor pricing, then reviewed against the sources below. Cost guides are estimates, not quotes — local pricing varies by region, materials, and labor.
Related cost guides
Local service pages
These service pages from our local network cover tankless water heater installation work in their areas: