Recommended by Dominick Plumbing
Navien Tankless Water Heaters
Endless hot water, condensing efficiency — our top tankless pick for Arizona homes.
- Licensed & Insured · ROC #350819
- Pro install & warranty
Why we recommend it
Navien Tankless Water Heaters — our honest take
Navien NPE-A2 and NPE-S2 condensing tankless water heaters are the units we install most in Scottsdale, Paradise Valley, and Phoenix. Up to 0.96 UEF efficiency, dual stainless heat exchangers, and a built-in recirculation pump on the A2 — endless hot water without the standby loss of a 50-gallon tank.
- Condensing efficiency means lower SRP / Southwest Gas bills
- Dual stainless exchangers handle Scottsdale hard water far better than competitors
- ComfortFlow on the NPE-A2 = instant hot at the fixture, no extra pump install
- Navien support and parts availability in the Valley is excellent
Key features
What you're getting
- Up to 0.96 UEF — among the most efficient gas water heaters made
- Dual stainless steel heat exchangers (won't crack like aluminum)
- ComfortFlow® built-in recirculation pump & buffer tank (NPE-A2)
- Up to 11.2 GPM — runs multiple showers + laundry simultaneously
- 2″ PVC venting up to 60 ft — easier retrofits in Arizona attics
- 15-year heat exchanger warranty
Specs at a glance
Navien Tankless Water Heater specifications
- Capacity
- 150,000–199,900 BTU/hr
- Max flow
- Up to 11.2 GPM
- Efficiency (UEF)
- 0.93–0.96
- Fuel
- Natural gas or propane
- Venting
- 2″ or 3″ PVC, concentric or twin-pipe
- Warranty
- 15-yr heat exchanger / 5-yr parts / 1-yr labor
FAQs
Common questions
Should I switch from a tank water heater to a Navien tankless in Scottsdale?
If your tank is 8+ years old, you run out of hot water with back-to-back showers, or you're tired of a 40–50 gallon tank sitting in the garage soaking up Arizona summer heat — yes. A Navien NPE-A2 will pay back through lower gas bills, free up garage space, and last 18–20+ years vs. 8–12 for a tank.
How much does a Navien tankless installation cost in Scottsdale?
Most Scottsdale Navien installs run $4,800–$7,200 fully supplied and installed, depending on gas line size, venting path, electrical, and whether we need a recirculation return line. We always provide a flat written quote before starting.
NPE-A2 vs NPE-S2 — which Navien should I get?
Get the NPE-A2 if you want instant hot water at every fixture (built-in recirculation pump and buffer tank). Get the NPE-S2 if you have a dedicated recirculation loop or simply want endless hot water at lower install cost. We'll spec the right one for your home.
Do Navien tankless heaters work with Scottsdale's hard water?
Yes — the dual stainless steel heat exchangers are far more scale-resistant than aluminum competitors. We still recommend annual descaling and pairing it with a softener (we like the Encore Reveal) to maximize the 15-year warranty.