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Maui

Tankless Water Heater Installation in Maui, HI

Fast, reliable service – done right the first time.

Licensed Hawaii plumbers serving Maui since 2019. We size, vent, and install tankless systems from Kahului and Kihei to Haiku and Kula, with a County permit and inspection on every job.

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Island homes use hot water heavily, and a tank heater in a warm Maui garage works against itself all day. Tankless removes stored water and frees up floor space. That matters in a home with an ohana unit or a rental downstairs. We handle gas, water, venting, and permits as one job. Salt air is part of the plan too, since a coastal install needs the right cabinet and vent termination.

Trusted Tankless Solutions for Maui Residents

We install every tankless configuration common in Maui homes. Each job includes a demand calculation, a gas and venting check, and a walkthrough before we leave.

Gas Tankless Water Heater Installation

A gas tankless unit fires at a much higher input than a tank heater, so the gas line often needs to be upsized. We check line size and supply pressure before recommending a model. For propane homes, we also confirm the tank and regulator can handle the load.

Electric Tankless Water Heater Installation

Electric units suit condos, ohana units, and places without gas service. They draw heavy amperage, so we confirm panel capacity and circuit space before quoting. If the panel can’t handle it, we say so instead of installing something that trips breakers.

Tank to Tankless Conversion

Converting requires new venting, gas or electrical capacity, and usually new water connections. We remove the old storage tank, handle the changeover, and pull the Maui County permit. Most conversions finish in a day.

Outdoor Tankless Installation

Maui’s climate makes outdoor mounting practical and frees up interior closet space. Coastal sites need corrosion-resistant hardware and careful vent placement away from salt spray. We mount, seal, and route condensate on condensing models.

Recirculation Pump Installation

A recirculation pump moves hot water to distant fixtures, reducing wait time at the tap. We fit dedicated return loops or crossover valve systems depending on how the home is piped. On long single-story layouts, this often determines whether people like the system.

Multi-Unit and Rental Property Installation

Homes with an ohana unit, guest cottage, or permitted rental need hot water in two places at once. We size for combined peak demand or install separate units where that works better. Commercial and multi-unit work follow the same permit and inspection process.

In Maui, a Tankless Install Is Permit Work, Not a Swap

Tankless installation in Maui is regulated work, and the permit isn’t optional paperwork. Maui County’s Plumbing Permit and Inspection Section names the code in force. The County adopted the 2018 Uniform Plumbing Code, requiring permits for new and retrofit plumbing installations.

That matters more on a tankless conversion than almost any other job. You change the gas load, venting, and often water connections at once. Each is a code item and something an inspector actually checks.

It also protects you afterward. An unpermitted gas appliance can stall a sale and give a manufacturer grounds to deny a warranty claim. Many Maui homes have a permitted ohana or rental unit. Unpermitted work on a shared gas system is a problem that surfaces at the worst time.

So we pull the permit, book the inspection, and build to the adopted code rather than habit. If a home’s gas line or vent path cannot meet current code, we tell you at the quote, not after the wall is open.

Our Tankless Installation Process on Maui

Every job starts with measurement and a look at what the home can supply. Sizing comes from fixture count and use, never from the size of the tank being removed.

  1. Demand and fixture count. We count fixtures, ask how the household uses hot water, and calculate peak flow in gallons per minute.
  2. Gas, power, and water check. We verify gas line size and supply pressure or panel capacity for an electric unit.
  3. Vent plan. We confirm vent material, length, and clearances for the model, and keep terminations clear of salt spray on coastal sites.
  4. Permit application. We apply for the Maui County plumbing permit before scheduling any work.
  5. Written quote. You get the full price up front, including permit cost and any gas line upsizing.
  6. Removal and install. We drain and remove the old tank, mount the new unit, and run water, gas, and venting.
  7. Service valves. We fit isolation valves with service ports as standard, so future flushing needs no pipe cutting.
  8. Inspection and walkthrough. We meet the County inspector, then fire the unit, check gas pressure under load, and show you the controls.

We leave the area clean and close out the paperwork. If the plan changes mid-job, we stop and get your approval before continuing.

Why Maui Homeowners Choose All Aloha Plumbing

We install tankless systems on Maui every week and pass inspection the first time. Our plumbers work on condensing and non-condensing equipment from major brands.

  • Licensed Hawaii plumbing contractor, license CT-36812, and insured.
  • We pull Maui County permits and attend inspections as part of the job.
  • Upfront pricing, quoted in writing before work starts.
  • Sizing from a real fixture count, never from the old tank size.
  • We check the gas line and panel capacity before committing to a unit.
  • Corrosion-aware hardware and vent placement on coastal installs.
  • 24/7 availability when a water heater fails outside business hours.
  • Flexible financing so a full conversion does not have to wait.

We live and work on Maui and are one family across three islands. The plumber who quotes your install is the one who walks you through the finished system.

Ready to Go Tankless on Maui?

Tell us how many bathrooms you have, whether you have an ohana unit, and how your household uses hot water. We will size the unit, price the permit, and provide it all in writing first. Book service online.

If your existing unit has failed rather than reached the end of its life, see tankless water heater repair. For leaks that show up after a heater fails, we also handle leak detection and slab leak repair across Maui.

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We help you choose the energy-efficient unit rightly sized for your home.

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Tankless Water Heater Installation

Maui Tankless Water Heater Installation FAQs

Do I need a permit to install a tankless water heater on Maui?

Yes. Maui County requires a plumbing permit for new and retrofit plumbing installations, and a tankless conversion changes gas, venting, and water connections at once. We apply for the permit before scheduling the job and meet the inspector when the work is done. The permit cost appears in your written quote. Unpermitted gas work can stall a home sale and void a manufacturer warranty.

How long does tankless installation take on Maui?

Most Maui tankless installs finish in one day. A like-for-like tankless replacement, where gas and venting already suit the new unit, often takes four to six hours. A first conversion from a tank takes longer because it adds venting and often a larger gas line. Permit processing and inspection scheduling fall outside that window, and we include the expected timeline in our quote.

Will salt air damage a tankless water heater on Maui?

Salt air attacks exposed metal, so a coastal install needs the right hardware and vent placement. We choose corrosion-resistant fasteners and mounting hardware and keep vent terminations out of direct salt spray where the site allows. Indoor installs avoid most of this, which is one reason we walk the site before recommending a location. Rinsing the cabinet exterior with fresh water occasionally helps on oceanfront properties.

Can one tankless unit serve a house and an ohana unit?

Sometimes, depending on peak simultaneous demand rather than square footage. If both kitchens and showers run at once, the unit must meet that combined flow. In many cases, two smaller units, one per dwelling, cost less to run and give better service than one oversized unit. We size based on combined peak demand and show you both options before you choose.

Does a tankless water heater need a bigger gas line?

Often, yes. A tankless unit fires at a much higher rate than a tank heater. A half-inch line that fed an old tank often cannot supply it. We measure line size and static gas pressure before recommending a unit. For propane homes, we also check tank and regulator capacity. When the line falls short, the fix is a larger run or a lower-input model, and the cost shows in the quote.

Is tankless worth it on Maui compared with a tank?

Tankless makes sense on Maui where space is tight, hot water demand spreads across the day, or a property has more than one dwelling. You get endless hot water, a smaller footprint, and a longer service life than a typical tank. The tradeoff is higher installed cost and periodic flushing to clear mineral buildup. We price both options for your home rather than pushing one.

Real Customers • Real Stories

What Our Ohana Says

5 star rating quote

“All Aloha came out super fast and fixed our leak the same day. Excellent service! These guys are real pros and treated my home with respect.”

HBM

Hawaii Bottle Man

Kahului, Maui

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“They replaced our water heater quickly and left everything spotless. The crew showed up exactly when they said they would. Couldn’t ask for better.”

RC

Ray Cabanting

Kihei, Maui

5 star rating quote

“Called at midnight with a burst pipe. They were here in 25 minutes and had it contained before the ceiling came down.”

TT

Thai Tran

Lahaina, Maui

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Three Islands. One Family.

From the North Shore to Hilo, we’re proud to bring honest plumbing with aloha to homes across Hawaii.

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