Tankless Water Heater Maintenance in Phoenix, AZ

Donley A/C & Plumbing in Phoenix, AZ, offers unparalleled expertise in tankless water heater maintenance. Known for our responsive service, we showcase unmatched skills in every job.

Whether routine maintenance or complex repairs, you can rely on our proven track record for keeping your tankless water heating system in peak condition.

Ensure your tankless water heater operates at its best with Donley A/C & Plumbing. Schedule tankless water heater maintenance by calling 602-787-3956 today.

When Tankless Water Heater Maintenance Is Necessary

Tankless water heater maintenance is necessary to ensure the unit’s optimal performance and longevity. Typically, it should be done annually, but it may need more frequent maintenance in areas with hard water to prevent scale buildup. 

Signs that maintenance is required include fluctuating water temperatures, reduced water flow, or unusual noises from the unit. Professional maintenance is needed if your tankless water heater delivers inconsistent heating, takes longer to deliver hot water, or displays error codes.

Schedule tankless water heater maintenance by calling 602-787-3956 today.

The Benefits of Tankless Water Heater Maintenance

Regular maintenance of tankless water heaters offers many benefits, including:

  • It extends the unit’s life span, preventing premature wear and tear.
  • It ensures operational efficiency, translating to a consistent hot water supply and potential energy cost savings. 
  • Maintenance helps identify and resolve issues before they become costly tankless water heater repairs.
  • It maintains water quality by preventing sediment buildup and ensures the unit complies with manufacturer warranties. 

Maximize the efficiency of your water heater with expert care from Donley A/C & Plumbing. Schedule water heater maintenance by calling 602-787-3956.

Our Maintenance Check Process

At Donley A/C & Plumbing, our highly trained and certified technicians excel in detecting and addressing tankless water heater issues through a comprehensive maintenance process:

  • Maintenance preparation: Our team starts by safely shutting off the energy source to your water heater and closing all water valves, ensuring no unintended water flow. We’ll then remove the port valve caps, connect hose lines to each valve, and open the port valves.
  • Descaling: We use a specialized descaling solution to remove any sediment buildup, ensuring smooth water flow in your water heater.
  • System flush: Your tankless water heater will be thoroughly drained and flushed, typically taking 45 minutes.
  • Sanitize: With the water heater emptied, we take the opportunity to clean and sanitize the interior and all its components.
  • Restart: We then restart your tankless water heater. Post-maintenance, it will operate at peak performance, delivering optimal results.

Schedule tankless water heater maintenance by calling 602-787-3956 today.

Preventative Maintenance Tips

Maintaining your tankless water heater is crucial for its longevity and efficiency. Here are three steps you can follow in between professional maintenance visits:

  • Visual inspection: Regularly examine your water heater for any visible damage, leaks, or signs of pests. Ensure the surrounding area is free from contamination.
  • Pressure valve check: Keep an eye on the pressure valve on the heater’s exterior. Refer to your owner’s manual for guidance. High pressure can lead to pipe damage, so consult a professional plumber if pressure levels are concerning.
  • Exterior cleaning: Occasionally clean the outside of your water heater to prevent dust and debris accumulation. 

Trust our professional service to keep your water heater in prime condition. Schedule maintenance with us by calling 602-787-3956 today. 

Plumbing - Water Heater | Donley

Why Choose Us?

As a family-owned business with over 40 years of experience, Donley A/C & Plumbing proudly offers top-notch tankless water heater maintenance. Our values ensure that every service we provide isn’t just a transaction but a commitment to maintaining the comfort and efficiency of your home.

For expert care from a family business, schedule tankless water heater maintenance with Donley A/C & Plumbing. Call 602-787-3956 to ensure your system runs smoothly for years to come.

Schedule Service

Expert & reliable service since 1976

Since 1976, Donley A/C & Plumbing has remained committed to providing expert and reliable service. Our experienced technicians and plumbers receive over 120 hours of continuous training per year, and all our work is fully guaranteed. Every staff member undergoes a rigorous drug screening and background check before joining our team or working with our valued customers.

As a local family-owned and -operated company, we strive to give back and support the community. Our commitment to excellence is why we’re two-time winners of the Better Business Bureau Ethics Award. It’s all part of what separates us from countless others in the industry.



Responsive and honest service



Our friendly staff will work with you to schedule a convenient appointment. The plumber will call you when in route to introduce themselves, provide an ETA, and confirm the reason for the service call.


Honest & Upfront Pricing

All pricing is listed in the plumber’s price book, ensuring no hidden fees or costs. We'll work with you on financing options by request.


Swift Installation

Our plumbers have the skill and experience to complete the repair or installation on the day of service. You won’t have to worry about a drawn-out and complicated process.



The plumber will review the completed repair or installation with you, including warranties. Once the job is complete, we're available to answer any questions or concerns.

Reliable & Expert Service | Donley Reliable & Expert Service | Donley Reliable & Expert Service | Donley Reliable & Expert Service | Donley Reliable & Expert Service | Donley
Valley-Wide Service | Donley

Valley-Wide Service, 7 Days a Week

We serve the entire valley with technicians available seven days a week. Even when problems arise on weekends or after hours, our professionals are only one call away. We proudly serve these cities:


  • Ahwatukee
  • Anthem
  • Carefree
  • Cave Creek
  • Chandler
  • Fountain Hills
  • Gilbert
  • Glendale
  • Goodyear
  • Mesa
  • Peoria
  • Phoenix
  • Queen Creek
  • Scottsdale
  • Sun City
  • Surprise
  • Tempe
  • Tolleson
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