Tankless Water Heater Installation in Mesa, AZ

A tankless water heater heats water on demand instead of storing 50 gallons and reheating it all day. Installed and sized correctly, it delivers endless hot water, cuts water heating energy use by 25 to 35 percent, and lasts 20 years or more. The Plumbing Dr. installs, converts, and repairs tankless units from Navien and Rinnai across Mesa and the East Valley.

Tankless is only as good as its install. Gas supply, venting, flow rate, and water hardness all have to be right, and in Mesa's hard water a scale filter and annual descaling aren't optional. We size the unit to your household's real demand, run the gas and venting to code, and set you up with the maintenance that keeps it running for two decades.

Tankless services we offer

New tankless installation (gas and electric)
Tank-to-tankless conversion, including gas line upsizing
Tankless repair and error-code diagnosis
Annual descaling and flush service
Scale filter and softener pairing for hard water
Recirculation setups for instant hot water

Tankless units are popular in newer Gilbert, Queen Creek, and Chandler homes and as upgrades in older Mesa and Tempe houses, but the East Valley's water hardness is the number one reason they fail early. Every tankless we install gets a scale filter at minimum, and we'll tell you honestly whether a water softener makes sense for your home. Garage installs also need venting that handles summer heat correctly.

Why Choose The Plumbing Dr. for Tankless Water Heaters

Sized to Your Household

Flow rate matched to real demand, so showers never go cold.

Code-Compliant Gas & Venting

Gas line upsizing and venting sized and installed to code.

Hard-Water Protection

Scale filters and descaling plans built into every install.

Financing Through Wisetack

Spread the cost of a 20-year upgrade.

Common Tankless Water Heater Issues We Fix

Water Runs Cold Mid-Shower

Usually a unit that's undersized for the demand, or scale restricting flow through the heat exchanger.

Error Codes on the Display

Ignition, venting, and flow sensor codes are common and usually repairable.

Long Wait for Hot Water

The unit's fine; the run to the fixture is long. A recirculation pump fixes it.

Reduced Flow Over Time

Scale buildup. Annual descaling restores it, and a scale filter prevents it.

Request Service

Also common

Gas supply too small on units installed by someone else
Condensate drain issues on condensing models

If a previous installer skipped the gas line upsizing or venting spec, the unit will underperform no matter the brand. We fix those installs regularly.

OUR PROCESS

Call & Assess

We check gas capacity, venting path, flow demand, and water hardness.

Quote & Install to Code

Flat price up front, then a full code-compliant install with proper gas, venting, and scale protection.

Test & Warranty

We verify flow and temperature at every fixture and back the work with a 2-year warranty.

What our customers say

Ryan and Spencer from The Plumbing Dr came to check my water heater because of some concerns I had. They were able run some tests on the equipment and give me some very helpful advice. They were respectful of my home, wearing shoe covers while inside, and respectful of my time. They were also very kind and friendly. While I ended up not needing a water heater repair at this time, I wouldn't hesitate to use them in the future.

Erica S.

We are so pleased with our service! We received an appointment in 2 days even though we didn't have an emergency. The plumber, Ryan, was so personable and very professional! He diagnosed our issues, fixed them, and even offered suggestions to avoid similar issues in the future! We were so impressed with him and will definitely use The Plumbing Dr again!

Gina P.

How much is a tankless water heater in Mesa?

Pricing depends on what the job actually needs, so we look first and quote second. You get a written price in hand before we pick up a tool, and that number does not move once we start. Whatever we do is covered by our two-year workmanship warranty. If it is a larger project, Wisetack financing shows up as a payment option on your invoice once the work is finished. Call (480) 735-9020 and we will tell you what we already know about jobs like yours.

Ask About Financing

Frequently Asked Questions

Everything you need to know about our services and process. If you can't find your answer, feel free to reach out to our team.

Is tankless worth it in Arizona?

For most households, yes. Lower energy use, endless hot water, and a lifespan of 20+ years versus 8 to 12 for a tank in our hard water. The key is correct sizing and scale protection.

How much does it cost to convert from a tank to tankless?

Conversions cost more than a tank swap because they often need a larger gas line, new venting, and an electrical outlet. We quote a flat price after checking your home, and financing is available through Wisetack.

How often does a tankless unit need descaling?

In Mesa's hard water, once a year. With a scale filter or softener, you can stretch that, but annual service is cheap insurance for a 20-year unit.

What brands do you install?

Navien and Rinnai, with AO Smith available on request.

Can a tankless unit run a whole house?

Yes, when it's sized correctly. A single 199,000 BTU gas unit handles most homes; larger homes may need two units or a recirculation loop.

The Plumbing Dr. technician repairing an underground sewer line in an open excavation

PLUMBING EXPERT
Cameron Balli

Cameron Balli is the owner and lead plumber of The Plumbing Dr., a locally owned, Arizona ROC-licensed plumbing company based in Mesa. After eight years in the trade, he started The Plumbing Dr. in 2023 with one standard: do the job right the first time, explain the work in plain language, and never sell a customer something they don't need. More about Cameron.

Proudly serving Mesa & the Phoenix East Valley