Tankless Water Heater Installation & Repair in Jacksonville & Orange Park, FL

A tankless water heater gives you hot water on demand, cuts standby energy waste, and frees up the floor space an old tank used to take. Lance Maxwell Plumbing installs, repairs, and maintains gas and electric tankless water heaters for homes and businesses across Jacksonville, Orange Park, and the rest of Clay, Duval, and St. Johns counties. We’ve been a locally owned plumbing company here since 1994, and we’ll make sure your tankless system is sized and installed to run the way it should.

Request tankless water heater service and we’ll get you scheduled.

Tankless Water Heater Services

Tankless Water Heater Installation

Most tankless problems start with a bad installation, so this is where we take the most care. Every installation includes:

Proper sizing based on how many fixtures run at the same time (flow rate) and how much the unit has to heat the incoming water
Gas line evaluation for gas units, since tankless heaters need far more gas volume than a tank. We upsize the gas piping when needed.
Correct venting for the unit and its location, indoor or outdoor
Electrical capacity check for electric units, which draw significantly more power than an electric tank
Isolation valves so the unit can be flushed and serviced easily for years to come

Tank-to-Tankless Conversions

Switching from a tank to tankless isn’t a straight swap. Gas supply, venting, water connections, and mounting location usually all change. We handle the full conversion, remove your old tank, and explain exactly what the job involves before we start.

Tankless Water Heater Repair

When a tankless unit acts up, it usually tells you with an error code. Our plumbers troubleshoot and repair:

Ignition and flame failure errors
Water that turns hot, then cold, then hot again
Low hot water flow or pressure
Units that shut off mid-shower
Scale buildup in the heat exchanger
Flow sensor, fan, and venting problems

Tankless Water Heater Maintenance & Descaling

Northeast Florida’s mineral-heavy water leaves scale inside a tankless heat exchanger. Left alone, it reduces efficiency, triggers error codes, and shortens the life of the unit. An annual descaling flush and inlet filter cleaning keeps your tankless water heater running efficiently and protects the investment you made.

Benefits of a Tankless Water Heater

Hot water that doesn’t run out, even with back-to-back showers
Lower energy use, since water is heated only when you need it
A compact, wall-mounted unit that frees up closet or garage space
A longer service life than a tank, often 20 years or more with maintenance
No tank to rust out and flood your utility area

Is a Tankless Water Heater Right for Your Home?

Tankless is a strong choice for households that regularly run out of hot water, homeowners planning to stay put long enough to benefit from the energy savings, and homes where space is tight. It’s worth a closer look if your home has a small gas line, limited electrical capacity, or a lot of fixtures running at once, because those factors affect sizing and installation cost.

If a tank still makes more sense for your home, we’ll tell you. Our water heater repair and replacement team handles gas, electric, and hybrid tank units too.

Tankless vs. Tank Water Heaters

Upfront cost: A tank costs less to buy and install. Tankless costs more, especially when gas or venting upgrades are needed.
Operating cost: Tankless avoids the energy a tank wastes keeping water hot around the clock.
Lifespan: Tanks typically last 8 to 12 years. Tankless units often last 20 or more.
Space: Tankless mounts on a wall. A tank needs floor space.
Hot water supply: A tank can run out. A properly sized tankless unit won’t.

Tankless Brands We Install and Service

We install and repair major tankless brands, including Rinnai, Navien, and Rheem. If you already have a unit, we can service it regardless of who installed it.

Why Choose Lance Maxwell Plumbing for Tankless?

Locally owned since 1994. More than 30 years serving Orange Park, Jacksonville, and Clay County.
Best of Clay winner four years running, 2021 through 2024.
Gas piping in-house, so your conversion doesn’t need a second contractor.
Installation through maintenance, from sizing and installation to repairs and annual descaling.
24/7 service when hot water stops unexpectedly.

Tankless Water Heater Service Across Clay, Duval & St. Johns Counties

We install and service tankless water heaters throughout Orange Park, Fleming Island, Middleburg, Green Cove Springs, and Julington Creek, plus Jacksonville neighborhoods including Mandarin, Deerwood, Baymeadows, Avondale, and Oakleaf Plantation.

Tankless Water Heater FAQs

How long does a tankless water heater last?

With annual descaling, most tankless water heaters last 20 years or more, roughly twice as long as a typical tank.

How often does a tankless water heater need to be flushed?

We recommend descaling once a year in Northeast Florida. Homes with a water softener may be able to go longer between flushes.

How much does tankless water heater installation cost?

It depends on the unit’s size, gas or electric, and whether your gas line, venting, or electrical service needs upgrading. Conversions from a tank cost more than replacing an existing tankless unit. We’ll give you a clear price for your home before work begins.

Will a tankless water heater give me instant hot water?

It gives you endless hot water, not instant hot water. Water still has to travel from the unit to the faucet, so the wait at the tap is similar to a tank. A recirculation setup can shorten that wait.

Does a tankless water heater work during a power outage?

Generally, no. Even gas tankless units need electricity to run their controls, fan, and ignition. It’s worth knowing before hurricane season.

Why does my tankless water heater go hot, then cold, then hot?

That’s often called a “cold water sandwich.” It can happen when hot water is turned off and on quickly, but if it’s frequent or getting worse, it can point to a sizing issue, a flow sensor problem, or scale buildup. We can diagnose it.

Upgrade to Tankless or Get Your Unit Running Again

Whether you’re switching from a tank or need a repair on an existing unit, Lance Maxwell Plumbing can help. Contact us to schedule tankless water heater service in Jacksonville, Orange Park, or anywhere in Clay, Duval, and St. Johns counties.