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Hawaii

Tankless Water Heater Installation

Fast, reliable service – done right the first time.

Tankless water heater installation on Hawaii by licensed plumbers, sized and installed to cut standby energy loss and deliver endless hot water. Book online.

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If your storage tank runs out of hot water mid-shower, takes up valuable space, or adds to an already high electric bill, a tankless water heater installation is worth considering. We help Hawaii homeowners choose the right size and fuel type, then install it to code so you get endless hot water on demand without heating a tank around the clock. Founded in 2019, we have built our reputation on doing this work right the first time.

What Hawaii’s High Energy Costs Mean for Your Water Heater

A tankless upgrade pencils out well on Hawaii because of the island’s high energy costs. The U.S. Energy Information Administration reports that Hawaii households had the highest average residential electricity bills in the nation in 2024, at $213 per month, even though they consumed the least grid electricity of any state.

That combination is key: when every kilowatt-hour is expensive, the energy a water heater wastes becomes a larger share of your bill than on the mainland. A storage tank loses heat continuously through its walls, called standby loss, and reheats that water using Hawaii’s costly electricity around the clock.

A tankless unit eliminates most standby loss by heating water only when you call for it. Savings that seem modest in a low-cost energy market are far more meaningful under Hawaii’s rates.

This is why we take sizing and fuel selection seriously when installing a tankless system here: the right unit, matched to your demand, turns the island’s high energy prices from a burden into the reason the upgrade pays off. We factor your actual usage into the recommendation so the efficiency gain is genuine rather than theoretical.

What Hawaii Customers Say About All Aloha Plumbing

Our reputation is built on responsiveness and follow-through.

Fast Response and Quality That Earned a Recommendation

Ray Kakuda chose us specifically because we responded faster than the competition, and stayed happy with both the quality of the work and the communication afterward. In his words:

“I selected All Aloha Plumbing because their response time to my request was faster than the competition. I am pleased with the work because of the quality and professionalism displayed by the service technician, Ray and the follow up communication from the staff. I would highly recommend them!”

Quick response, quality work, and clear follow-up are the standards we uphold on every installation. Read Ray’s full Google review.

On Time, Professional, and Thorough

Ronny praised our technician for showing up on time, explaining everything, and answering every question, right down to appreciating the office staff. He shared:

“I am more than pleased with the work that was done. Your employee Shack was awesome. He was on time, very personable and professional. He explained everything and answered all my questions. Even the office staff was great. I would not hesitate to recommend All Aloha Plumbing to my family and friends. If I need any plumbing work in the future, you will be the only one I call. Mahalo, Ronny”

Being on time and explaining the work is exactly how we approach a tankless installation from start to finish. Read Ronny’s full review on Google.

Why Homeowners Are Switching to Tankless on Hawaii

A traditional storage tank keeps 40 to 50 gallons of water hot every hour of every day, whether you use it or not. A tankless water heater instead fires only when you open a hot tap, heating water as it flows through the unit.

For an Hawaii household, that difference matters more than almost anywhere else in the country. It means you stop paying to reheat a tank that sits unused all day, free up the floor or closet space the old tank occupied, and get hot water that does not run out partway through the second shower.

Tankless units tend to last longer than tank models and carry a lower risk of a sudden tank rupture that could flood a garage. When we walk a homeowner through installing a tankless water heater, we lay out the tradeoffs plainly so the decision fits your home and budget.

Why Choose All Aloha Plumbing for the Switch

Founded in 2019 and serving Hawaii homes and businesses under Hawaii license CT-36812, we are a locally rooted, family-oriented team. Homeowners choose us because we size and install based on your actual hot water needs, not a one-size-fits-all guess.

  • Professional installation tailored to your home’s hot water demands and plumbing system
  • Expert guidance to help you choose the right high-efficiency tankless water heater
  • Licensed installers ensuring safe, code-compliant installation and reliable performance
  • Upfront, transparent pricing with a detailed estimate before installation begins
  • Removal and disposal of your old water heater for a hassle-free upgrade
  • Thorough system testing and a complete walkthrough so you know how to operate and maintain your new unit

Schedule Your Hawaii Tankless Water Heater Installation

If you are tired of running out of hot water or watching a storage tank pad your electric bill, a properly sized tankless unit is one of the best upgrades you can make in an Hawaii home. We are ready to assess your needs, recommend the right unit, and install it to code so you get reliable hot water for years to come.

Need Tankless Water Heater Installation on Hawaii?

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Quick Answers

Good To Know

Is a tankless water heater worth it on Hawaii?

For many homes, yes. Because Hawaii has the highest electricity costs in the country, the standby energy a storage tank wastes is more expensive here than almost anywhere else, so eliminating it with a tankless unit tends to pay off faster. The best way to know for certain is to have us review your usage and current setup and give you an honest projection.

How long does a tankless installation take?

A relatively simple replacement can often be done in a day, while a full tank-to-tankless conversion that requires new venting, gas, or electrical upgrades takes longer. After we assess your home, we give you a clear timeline and upfront pricing before we begin.

Will one tankless unit supply my whole house?

It can, as long as it is sized correctly for your peak demand. We calculate how many fixtures and appliances you run simultaneously and select a unit with a flow rate that matches. For very large homes with heavy simultaneous use, we sometimes recommend more than one unit.

Do tankless water heaters require maintenance?

Yes. Like any water heating system, a tankless unit benefits from routine maintenance to maintain efficiency and extend its lifespan. Periodic flushing helps remove mineral buildup, while regular inspections ensure that the burner, heat exchanger, and other components continue to operate safely and efficiently.

Can I replace my traditional water heater with a tankless system?

In most cases, yes. Many homeowners switch from a conventional storage tank to a tankless water heater for improved energy efficiency and endless hot water. Depending on your home’s existing plumbing, gas, or electrical setup, some modifications may be needed to ensure a safe, code-compliant installation.

How long does a tankless water heater last?

With proper installation and routine maintenance, a quality tankless water heater can last 20 years or more, often significantly longer than a traditional tank-style water heater. Regular service helps maximize performance, reliability, and the life of the system.

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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

Honolulu, Oahu

5 star rating quote

“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

Kailua, Oahu

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

Kapolei, Oahu

View All Reviews

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Proudly Serving

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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Kailua-Kona • Hilo • Waimea

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