1400 Central Ave, Albany, NY 12205 Open 24/7, nights, weekends and holidays 4.9 Rating · 31+ Google Reviews
Wall mounted tankless water heater installation
24/7 plumbing service

Tankless Water Heater Repair and Installation in New York

Whether your Navien is flashing an error code or you are ready to trade the tank for endless hot water, we repair, maintain and install tankless water heaters across New York.

Open 24/724 hour emergency plumber
4.9 Stars on Google31+ real reviews
Fully Insured7 years in business
Upfront PricingQuote before work starts

Quick answer: Yes. Navien repair is one of the most common tankless calls we get. We diagnose error codes, clean inlet filters, descale heat exchangers, check venting and condensate drains, and replace failed sensors and components. You get an upfront quote before any repair starts.

A tankless water heater heats water only when you open a tap, so you get a steady supply without a storage tank taking up floor space. They are efficient and compact, but they are also precise machines. Flow sensors, heat exchangers, inlet filters and venting all have to be in good shape, and hard water scale is the most common reason they fail. Fullerton Plumbing repairs and installs tankless units, and we see a lot of Navien models, since that is one of the most popular brands in New York homes.

For repairs, we start with the error code and the unit's history, then check flow, the inlet filter, venting and the heat exchanger for scale. Many problems are fixed with a thorough descaling flush and a cleaned filter. For new installations, we size the unit for your home's peak demand, not just the number of bathrooms, and plan water connections, venting and isolation valves so future maintenance is easy. Every job comes with an upfront quote before work starts.

Two wall mounted tankless water heaters installed by Fullerton with new copper water piping
Know the warning signs

Signs Your Tankless Water Heater Needs Service

  • The display shows an error code or the unit will not fire up.
  • Hot water turns cold in the middle of a shower.
  • Temperature swings when someone else opens a tap in the house.
  • Hot water flow is weak compared to cold water flow.
  • The unit has not been descaled in more than a year in hard water.
  • You hear unusual clicking, whistling or fan noise when it runs.
What is included

What Our Tankless Water Heaters Service Covers

  • Navien tankless water heater repair and troubleshooting
  • Error code diagnosis on Navien, Rinnai and other brands
  • Descaling flushes through installed service valves
  • Inlet filter, flow sensor and condensate drain service
  • New tankless installations sized for peak household demand
  • Tank to tankless conversions with an upfront quote
How it works

Our Tankless Water Heaters Process

Read the Error Code

Tankless units tell you a lot. We read the error code and service history, then confirm what the code points to. Navien and other brands use codes for flow, ignition, venting and overheating issues, and each leads to specific checks.

Inspect and Test

We check the inlet filter, flow sensor, water pressure, venting, condensate drain on condensing models and the heat exchanger. Scale is the usual suspect, so we look closely at how the unit performs under real demand.

Descale or Repair

Many issues are solved with a descaling flush through the service valves and a cleaned inlet filter. Failed sensors or components are replaced. You get an upfront quote before any repair or part replacement begins.

Verify Steady Performance

We run multiple fixtures at once to confirm steady temperature and flow. We clear any stored error codes, show you the service valves, and recommend a realistic descaling schedule based on your water.

New York plumbing

Why Tankless Units Need Extra Care in New York

Tankless heaters and hard water do not mix well without maintenance. In western New York and the Finger Lakes, where limestone geology gives water high mineral content, scale builds inside the narrow passages of the heat exchanger and can trigger overheating errors or reduced flow. Even areas with softer municipal water see some buildup over time. Cold winter inlet water also matters, because a tankless unit has to raise the temperature further in January, which reduces how many fixtures it can serve at once. Sizing for a New York winter, not an average day, is essential.

If your Navien or other tankless unit is acting up, call Fullerton at (518) 776-7838. We answer 24/7 from our Albany base, serve all of New York State and will get your hot water back. If your unit is past saving, or you are ready to move from a tank to tankless, we will size a new one for winter demand and give you an upfront quote before any work starts.

Pricing

What Affects the Cost of Tankless Water Heater Service

Tankless service cost depends on whether you need a descaling flush, a part replacement or a full installation. Repairs vary with the failed component and the model, since some parts are more involved to replace than others. For new installations, the unit's size and type, venting needs, water connections, condensate drainage and whether you are converting from a tank all affect the price. A water softener may be recommended in hard water areas. We give you an upfront quote before any work starts.

Call (518) 776-7838 for an upfront quote. We answer 24/7 and explain the price before any work starts.

Real photos from our jobs

Recent Plumbing Jobs

No stock photos here. These are our own technicians, our own equipment and real repairs.

Two wall mounted tankless water heaters installed by Fullerton with new copper water piping
Dual tankless water heater installation with new copper piping
Two new tank water heaters side by side in a commercial mechanical room installed by Fullerton
Twin tank water heaters installed for a commercial building
Commercial water service room with valves, meters and copper piping serviced by Fullerton plumbers
Commercial water service room, valves and piping serviced
Fullerton hydro jetting machine with high pressure hose reel used for drain and sewer cleaning
Our hydro jetter, ready for grease and root clogs
Real Google reviews

What Customers Say About Fullerton

4.9
31+ Google reviews
Read all reviews
★★★★★
Came on short notice replace my water heater! answered all my questions. Great service highly recommend there technicians!!
Owner reply: Kenzie - we truly appreciate your feedback. As usual, your satisfaction is our pride. Glad to serve you
Kenzie FlipsGoogle review, November 2024
★★★★★
We needed a new water heater and Fullerton made the whole process stress-free. Quick installation and great customer service!
Dominique SotoGoogle review, November 2024
★★★★★
The technician was on time, knowledgeable, and fixed our issue with our water heater quickly. Great service at a fair price. Highly recommend!
Dylan DixonGoogle review, November 2024
Local service

Tankless Water Heaters Near You

We provide tankless water heaters across New York State from our Albany base, with daily coverage throughout the Capital Region.

FAQ

Tankless Water Heaters Questions, Answered

Yes. Navien repair is one of the most common tankless calls we get. We diagnose error codes, clean inlet filters, descale heat exchangers, check venting and condensate drains, and replace failed sensors and components. You get an upfront quote before any repair starts.

Common causes include scale buildup in the heat exchanger, a clogged inlet filter, low flow that does not trigger the unit, or too many fixtures running for the unit's capacity. A cold sandwich effect between uses is also normal for some models. We test to find which one applies.

Many manufacturers recommend descaling at least once a year, and more often in hard water. In western New York and the Finger Lakes, homes with hard water may benefit from more frequent service or a water softener. Your unit's manual and our inspection will set the right schedule.

It depends on the unit's size and model, your existing setup, venting requirements, water connections and condensate drainage. Converting from a tank usually involves more work than replacing an existing tankless unit. We assess your home and give you an upfront quote before any work starts.

For many homes, yes. You get continuous hot water and save floor space. The tradeoffs are a higher upfront cost and the need for regular descaling in hard water. Sizing it for cold winter inlet water is critical. We will help you decide whether it fits your home.

Navien codes point to specific issues, such as ignition problems, flow or water supply issues, venting faults, overheating or sensor failures. The exact meaning depends on the code and model. Write down the code and call us, and we can usually narrow down the cause before we arrive.

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