Published July 27, 2026 · Updated October 2, 2026
A standard Navien tankless water heater installation from Zest Plumbing & Drain runs $6,495 in Scottsdale. That is a flat-rate price, quoted in full before any work begins, with no trip charge. The final number depends on your home’s gas line and venting setup, the unit size your household needs, and whether you are converting from a tank system or replacing an existing tankless unit.
For comparison, a standard 40 or 50 gallon tank replacement runs $2,195 electric or $2,395 gas. Tankless costs more up front, lasts longer, saves space, and delivers unlimited hot water. Not sure which is right for your home? Read our tank vs tankless comparison for who actually benefits from each.
2026 Scottsdale Tankless Costs at a Glance
| Service | Zest price |
|---|---|
| Standard Navien tankless installation | $6,495 |
| Tankless water heater repair | $350 to $950 |
| Tankless diagnostic (only when needed) | $179 |
| Standard tank replacement, for comparison | $2,195 electric / $2,395 gas |
What Changes the Installation Price
- Tank to tankless conversion. This is the most involved path: it can require gas line upsizing, new venting, and sometimes additional plumbing connections. We evaluate all of it before quoting.
- Tankless to tankless replacement. A straightforward swap of an existing unit is less involved and sits at the standard rate.
- Unit size. Sizing is driven by your household’s peak hot water demand: how many showers, appliances, and fixtures run at once.
- Gas and venting condition. Homes with adequate gas supply and workable venting need less modification.
You get the full installation price before any work begins. No allowances, no surprises mid-job.
Tankless and Scottsdale Hard Water
Scottsdale’s hard water is no joke for tankless systems. Scale builds up inside the heat exchanger and, without maintenance, shortens the system’s life and triggers error codes. Two things matter here: regular flushes, and pairing the system with a water softener if your home does not have one. A whole-home softener runs $2,150 for a 48K water softener or $3,998 for a softener and regenerating carbon system, installed. Maintained properly, tankless units commonly outlast tank heaters by a decade or more.
Repairs
Tankless repairs run $350 to $950 depending on the failed component: flow sensors, igniters, or a heat exchanger scaled up from hard water. A $179 diagnostic charge applies only when needed to properly isolate the failure, and your plumber reviews it with you before anything is started.
Why Scottsdale Homeowners Choose Zest Plumbing & Drain
- Locally owned, not corporate, not private equity
- Serving Scottsdale since 2008
- 1,400+ five star Google reviews
- Licensed, bonded, and insured Arizona plumbing contractor
- Flat-rate, upfront pricing with no trip charge
- Financing available
Frequently Asked Questions
Q: How much does tankless water heater installation cost in Scottsdale? A: A standard Navien tankless installation from Zest Plumbing & Drain runs $6,495 flat-rate. The final price depends on gas line, venting, and unit size requirements, and you get the full number before any work begins.
Q: Is converting from a tank to tankless more expensive? A: Usually yes. Conversions typically need gas line upsizing, new venting, and sometimes extra plumbing connections, while replacing an existing tankless unit is a simpler job. We quote the full scope up front either way.
Q: Are tankless water heaters worth it in Scottsdale? A: For most households that plan to stay in the home, yes. Tankless lasts longer, frees up space, and delivers unlimited hot water. The tradeoffs are higher upfront cost ($6,495 versus $2,195 to $2,395 for a tank) and the need for regular maintenance in our hard water.
Q: How much do tankless repairs cost? A: Repairs run $350 to $950 depending on the component. A $179 diagnostic applies only when needed to isolate the failure, and it is reviewed with you first.
Q: Is there a trip charge? A: No. No trip charge and no service call fee, and every price is quoted in full before work begins.
Get Your Exact Price in Writing
Call 480.618.1750 or book online and we will size the right unit for your home.
Zest Plumbing & Drain 16445 N 91st St #107, Scottsdale, AZ 85260 480.618.1750 | info@callzestplumbing.com
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