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How Much Does a Tankless Water Heater Cost?
Quick answer: A whole-home tankless water heater typically costs about $2,500–$5,000 installed as an example range: unit $800–$2,500 plus installation $1,000–$3,000, with gas-line, venting or electrical upgrades adding more. Point-of-use electric units can be under $1,000 installed. Estimate, not a guarantee — get licensed quotes.
Context: what you are actually paying for
The price tag on a tankless unit is only part of the cost. Installation, any fuel upgrades and venting often cost as much as the unit itself. Switching from a tank to tankless also changes how your home uses gas or electricity, so the first install is usually the most expensive; later replacements are simpler.
Terms
- Unit cost: the heater itself, set mostly by GPM capacity, fuel and condensing vs non-condensing design.
- Install cost: labour, fittings, valves, mounting, removal of the old tank.
- Upgrade cost: gas line upsizing, new venting, electrical panel or circuits.
- Operating cost: yearly energy; see the cost savings calculator.
Cost table (example ranges)
| Type | Unit (example) | Installed total (example) |
|---|---|---|
| Point-of-use electric | $150–$600 | $400–$1,200 |
| Whole-home electric | $500–$1,500 | $1,500–$4,500+ (panel work varies) |
| Non-condensing gas | $800–$1,600 | $2,500–$4,500 |
| Condensing gas | $1,200–$2,500 | $3,000–$6,000 |
| Propane | $900–$2,500 | $2,800–$5,500 |
Process: building your estimate
- Size the unit with the tankless size calculator.
2. Decide fuel — see electric vs gas tankless.
3. Ask whether your gas line or panel needs upgrading (installer check).
4. Add venting, permit and haul-away.
5. Compare with the cost of a new tank and expected energy savings.
Worked example
Figures below are illustrative examples (2026-10-29), not quotes or guarantees.
Assumptions: natural gas, 6 GPM peak, condensing unit, existing ½-inch gas line needs upgrading.
- Unit: $1,400
- Installation: $1,800
- Gas line: $500
- Venting (PVC): $300
- Permit: $150
Example total: $4,150. If a replacement tank would cost $1,800 installed, the difference is about $2,350. With example savings of $80/yr, simple payback would be roughly 29 years — which is why many buyers choose tankless for endless hot water and space savings rather than payback alone. Lifespan matters too; see tankless lifespan.
What pushes cost up or down
- Up: long vent runs, gas-line or panel upgrades, tight spaces, high labour markets, cold-climate sizing.
- Down: like-for-like tankless replacement, existing adequate gas line, outdoor install in mild climates, smaller household peak.
Mistakes to avoid
- Comparing unit prices online without the upgrade costs.
- Accepting a single verbal quote.
- Undersizing to save money and then losing flow in winter.
FAQ
Is tankless worth the cost?
It depends on your usage, fuel prices and how long you stay. Compare in tankless vs tank.
Are there rebates?
Some utilities and governments offer rebates for high-efficiency units; check current programs locally.
Why do quotes vary so much?
Different assumptions about upgrades, venting and labour. Ask each installer to itemize.
Does maintenance add cost?
Yearly descaling, roughly $0–$150 DIY-supplies to pro service as an example. See tankless maintenance.
Safety and code reminders
Gas, venting, combustion air, condensate disposal and high-amperage electrical work all carry real safety risks, including carbon monoxide, fire, scalding and shock. They are also governed by local code and permits that differ between towns and provinces or states. Treat every step on this page as preparation for a professional visit, not as instructions to do the work yourself. Keep the manufacturer's manual for your exact model, set water temperature with scald risk in mind (120°F is a common household target), and stop and call a licensed professional whenever something is unclear.
Quick reference: typical fixture flow rates
These example flow rates help you translate everyday use into the GPM numbers used throughout this site. Check the rating stamped on your own fixtures, as older fixtures often run higher.
| Fixture | Example hot-water flow |
|---|---|
| Low-flow showerhead | 1.5–1.8 GPM |
| Standard showerhead | 2.0–2.5 GPM |
| Bathroom faucet | 0.5–1.2 GPM |
| Kitchen faucet | 1.0–1.8 GPM |
| Dishwasher | 0.8–1.5 GPM |
| Washing machine (warm) | 1.0–2.0 GPM |
| Bathtub fill | 2.0–4.0 GPM |
Add only the fixtures that genuinely run at the same time. Running the dishwasher or laundry outside shower hours is the simplest way to stay within a unit's capacity.
Questions to ask a licensed installer
Bring these questions to every quote so you can compare them fairly. Good installers welcome them, and the answers often reveal hidden costs before work starts.
- What peak GPM and temperature rise did you size this unit for, and what inlet water temperature did you assume for winter?
- Is my existing gas line, meter or electrical panel large enough, and if not, what exactly needs upgrading and what does that line item cost?
- What venting route will you use, how long is it, and does it meet the manufacturer's instructions and local code?
- Does the quote include a permit, isolation (service) valves for future flushing, a condensate drain if needed, and removal of the old heater?
- What are the labour warranty and the manufacturer's heat-exchanger and parts warranty terms, and do they require registration or yearly professional service?
- How long will the install take, and will there be a period without hot water?
How to read the numbers on this site
Every figure on TanklessMath is a planning estimate. Ranges reflect typical North American examples as of 2026-10-29 and will differ with your region, home, fuel prices and installer. Equipment ratings vary by model, so always check the specification sheet for the exact unit you are considering. When our example and a licensed installer disagree, trust the installer who has seen your home.
Next steps
Write down your peak fixtures, coldest incoming water temperature, fuel type and possible locations, then ask at least two licensed installers to confirm sizing, venting, gas or electrical capacity, permits and local code. Compare written quotes line by line so the unit, labour, materials and upgrades are separated. Questions about this site: hello@charlandandco.com.
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