Scottsdale homes can run tankless water heaters well, but city water gets harder the farther south you live, and a water heater replacement in Scottsdale needs a Minimum Plumbing Permit. Any gas line work needs a full plumbing permit. Call the number on this page to be connected with a local plumber in Scottsdale.
Scottsdale Water draws on Colorado River water through the CAP canal, Salt and Verde River water through SRP, city wells and recycled water, and disinfects with chlorine rather than chloramine. The city's hardness figures differ by area: softest north of Chaparral Road and hardest south of Indian School Road. That pattern matters more for a tankless heater than for a tank, because scale collects in the small passages of the heat exchanger.
What to do now
- Find your hardness area. Note where you sit relative to Chaparral and Indian School Roads, then read the city's water quality report and hardness fact sheet.
- Confirm your fuel. Check your bills. With natural gas, note where the meter is; in an all-electric house, ask about electrical capacity before choosing an electric tankless model.
- Count peak demand. Add up the showers and appliances running at once on a busy morning. That number, not the square footage, sizes the unit.
- Plan for the permit. Scottsdale issues a Minimum Plumbing Permit with no plan review for gas or electric water heater replacement, and a plumbing permit for gas line changes, through its SPUR portal. The One Stop Shop is at 480-312-2500.
- Decide on recirculation. In a sprawling single-story home, a recirculation pump or return line can cut the wait at distant bathrooms.
Symptoms and likely causes
| Symptom | Likely cause |
|---|---|
| Hot water flow weaker than it used to be | Scale in the heat exchanger or a clogged inlet filter |
| Unit shuts off when only a trickle runs | Flow below the activation minimum |
| Water swings hot, cold, then hot | Cold water sandwich after a short pause, or a sticking mixing valve |
| Ignition error at startup | Gas line too small, low gas pressure or a vent blockage |
| No hot water after a cold night | An exterior unit lost power to its freeze protection |
What affects cost
The biggest factors are gas pipe size from the meter, the vent path, whether a condensing unit needs a drain, and how far the new location is from the old tank. In the harder southern parts of the city, many owners also budget for a softener or scale filter. The permit adds a fixed cost. If you ever smell gas, leave the house and call 911 and your gas utility from outside; its name and emergency line are printed on your gas bill.
Tankless Water Heaters questions in Scottsdale
Is a water softener worth adding ahead of a tankless unit?
Do I need a permit to switch from a tank to a tankless water heater?
Can a recirculation pump shorten the wait for hot water?
Can a tankless heater freeze on a rare cold night?
More plumbing services in Scottsdale
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