Tankless Water Heater Repair In Big Island, HI

A malfunctioning tankless water heater can disrupt your daily routine. At Steve’s Plumbing and A/C – Big Island, we provide responsive repair services to restore your hot water. Our team is trained to diagnose and fix tankless systems of all types quickly and correctly.

Why Big Island Homeowners Trust Our Team

Local experts in high-efficiency water heater repair
Fast diagnosis and repair for all models
Service across the island, from Hilo to Kona
Focus on quality and system longevity
Transparent pricing and courteous professionals

Why Choose Steve's?

Four decades of trust. One simple promise.

We’ve been part of Hawaiʻi homes since 1986. Locally operated, community-rooted, and backed by the kind of guarantee most companies won’t put in writing.

24/7 Service

5-Star Service

We Do It Right

Community Focused

Locally Operated

Specials

Financing Options Available

Need a new system? Don’t let cost hold you back. We offer flexible financing with approved credit so you can stay comfortable now and pay on your terms.

Get the Reliable, Island-Trusted Service You Deserve

From emergency repairs to full system installs, Steve’s keeps your home comfortable, efficient, and worry-free.

Top-Quality Plumbing Services Near Big Island, HI

We offer a full line of installation, maintenance and repair that your home’s plumbing may require, no matter the problem or time of year. You can count on the trusted professionals at Steve’s Plumbing and A/C Service – Big Island for exceptional service and quality craftsmanship.

Don’t Let a Small Issue Turn into a Full System Failure

Our team understands how to spot issues early and make fast, affordable repairs. We help extend the life of your tankless system and keep it running at full capacity.

Issues We Commonly See and Repair:

Ignition or sensor failure
Hard water damage and mineral buildup
Intermittent hot water or low flow
System shutdowns and diagnostic error codes
Internal leaks or vent blockages

Zero Hot Water

Perhaps the most obvious and concerning sign and symptom of a broken tankless water heater is having no hot water in your Big Island, HI house. Any time you simply cannot get any hot water out of your faucets, showers, or other hot-water using appliances, unfortunately, your inclinations are probably correct. Have a certified plumber inspect your tankless water heater, diagnose the issue, provide a solution, and repair your water heater.

Multiple Appliance Issues

Oftentimes when a tankless water heater is experiencing issues that require professional repair, it will then affect other water-using appliances around your Big Island, HI home. If you’ve noticed issues with hot water in regard to your washing machine or dishwasher, it’s time to schedule an expert tankless water heater repair.

Power Issues

Is your tankless water heater shutting itself off? This is a problem. Power issues with your tankless water heater are usually an indication of a clogged filter. Tankless water heaters create extremely hot exhaust, and if your unit is not properly ventilated for whatever reason, it will cause your system to break down and shut down. In the event of power issues within your tankless water heater, address the issue right away to avoid potential fire hazards with your water heater.

Discolored and Foul-Tasting Water

Any time that your water supply is discolored and tinted with a brown, red, yellow, black hue and/or has a foul, metallic tasting smell to it, something is wrong. Since tankless water heater units do not have a reservoir bank for sediment to form in, you shouldn’t have discolored or foul tasting water, so in the event that you do, have one of our plumbing experts examine your water heater and water supply to pinpoint the issue and provide repair solutions. It should be noted that water discoloration and foul-tasting water can be caused by many other things in your Big Island, HI home, but if you notice it in conjunction with any of our other listed signs of a tankless water heater in need of repair, it’s likely due to your water heater.

Odd Noises

Your tankless water heater system will likely make very faint noises in its normal operation, but if you notice any odd, loud noises such as banging, humming, screeching, or knocking, there is something wrong with your water heater. Make sure to schedule an expert tankless water heater repair as soon as you possibly can if you hear any loud and unfamiliar noises coming from your tankless water heater.

Leaking Water

Tankless water heaters should never leak water, so if you are noticing water leaking from your unit, address it immediately. It could be due to a loose valve or fitting, or something much more complex, but professional assistance will be needed.

We’ll walk you through the repair, show you the results, and offer tips to help avoid future problems.

Relax, We'll Handle It

Tankless Water Heater Repair In Big Island, HI FAQs

My tankless water heater stopped producing hot water on the Big Island. What's likely wrong?

The most common causes on the Big Island are scale buildup restricting flow through the heat exchanger, a tripped or empty propane supply, or an error code from the control board indicating a component fault. Check whether the propane tank has fuel and whether the regulator has tripped. Look at the unit’s display for any error codes. If propane supply is confirmed and there’s no error code, a severely scaled heat exchanger can reduce flow to the point where the unit won’t fire. A plumber can diagnose whether the issue is scale, a flow sensor, igniter, or control board failure.

Can a tankless water heater be repaired, or does it need to be replaced when it fails on the Big Island?

Most failures are repairable. Flow sensors, igniters, gas valves, and control boards are all serviceable components on most major brands. The exception is a severely corroded or cracked heat exchanger, which typically makes replacement more economical than repair, especially on older units. A plumber can diagnose the specific fault and give you a straight comparison of repair cost versus replacement cost, including the efficiency and warranty benefits of a new unit if that’s the better direction.

What are common signs that a tankless water heater on the Big Island needs repair?

Fluctuating water temperature during a shower, longer than usual wait times for hot water to arrive, error codes on the display, reduced hot water pressure, and any unusual sounds like clicking, banging, or hissing are all signs that service is needed. A unit that frequently trips and needs to be manually reset is indicating a developing fault rather than a one-time event. Ignoring recurring symptoms typically leads to a complete failure rather than a simpler repair.

How does hard water on the Big Island cause tankless water heater failures?

Hard water carries dissolved calcium and magnesium that precipitate out as mineral scale when water is heated. In a tankless unit, the heat exchanger operates at high temperatures and scale builds up on the interior tube walls, reducing the tube’s diameter and restricting water flow. If the flow drops below the unit’s minimum activation threshold, it won’t fire at all. Scale also acts as an insulator, forcing the heat exchanger to work harder to heat the water, which accelerates wear. Annual descaling removes the buildup before it causes permanent damage.

Does Steve's Plumbing service all tankless water heater brands on the Big Island?

Steve’s Plumbing & A/C Service repairs the major tankless water heater brands found on Big Island properties, including Rinnai, Navien, Noritz, and Rheem. Diagnostic and repair service includes reading error codes, testing components, and sourcing replacement parts. If you’re not sure whether we service your specific model, call us with the make and model number and we’ll confirm availability and schedule a service call.

Tankless Water Heater Repair In Big Island, HI

Why Big Island Homeowners Trust Our Team