What it costs: Quoted by unit and by what the conversion needs, which is where tankless jobs differ most: gas line sizing, venting and often an electrical circuit. We price the whole conversion, not just the box. See typical tankless water heaters pricing.
Signs you need tankless water heaters
- Running out of hot water during back-to-back showers with an old tank
- Wanting garage or closet space back
- Error codes or declining flow on an existing tankless (usually scale)
How we handle it
Gas & venting check
Tankless needs adequate gas supply and sealed venting, we verify your line can feed it before quoting.
Scale protection built in
We pair every install with a softener or an isolation/scale-filter kit so AZ minerals don't choke it.
Annual descale plan
We set you up on a yearly flush so the warranty stays valid and flow stays full.
What to know about tankless water heaters in Arizona
A tankless unit heats water on demand through a heat exchanger instead of storing 40-50 gallons, so it never runs out and isn't bleeding heat all day. The catch in metro Phoenix is the same hard water that kills tanks goes after those narrow exchanger passages even faster. Scale builds where water runs hottest and tightest, and once that exchanger scales up it throws error codes, drops flow, and quits. That's why tankless and water softening come as a pair out here. It isn't an upsell. It's how the thing survives.
Descaling isn't optional. A tankless should be flushed with a descaling solution about once a year in our water, more often without a softener. A lot of units now ship with isolation valves (service valves) for exactly this reason. If yours doesn't have them, adding them turns every future flush into a quick job instead of a teardown. Skip descaling in 18-grain water and you can choke a $1,500-plus appliance in a couple of years. That wipes out the lifespan advantage you paid for in the first place.
The honest math on tankless isn't just 'endless hot water.' Gas tankless units usually need a larger gas line and a dedicated, sealed venting path. So retrofitting one into a home plumbed for a tank can mean upsizing the gas supply and running new stainless vent. That's real cost, and it surprises people. Electric tankless can demand a heavy electrical service upgrade. We'll tell you straight whether your home's existing gas, venting, and panel actually support the unit you want before you commit, because a poorly matched install underperforms.
Tankless rewards the right household and the right water. With proper sizing, softening, and annual descaling, a quality unit lasts 18-20 years, well past a tank's life, and it frees up floor space. But it asks for discipline. Soften the water, flush it yearly, and respect the flow-rate limits (a single unit may struggle to run two showers and a dishwasher at once in winter when incoming water is colder). In Flagstaff and Prescott, colder inlet temperatures raise the required temperature rise, so sizing that's fine in Phoenix may fall short up north.
Tankless Water Heaters across Arizona
We provide tankless water heaters throughout the Phoenix metro and Northern Arizona high country: