Tankless Water Heater Repair & Installation in Lithonia, GA

A gas tankless water heater burns gas for heat, yet it cannot make a drop of hot water without electricity. The control board, combustion fan, igniter, flow sensor, display and freeze protection all run on household power, usually through an ordinary outlet or a dedicated circuit. That small electrical side is behind a fair number of no-hot-water calls, and it is easy to overlook because owners think of the unit as a gas appliance. Gas and electric tank models are covered in our water heater overview for Georgia.

What electricity does inside a gas unit

• Control board: reads the sensors and decides when to fire, how hard and when to stop.
• Combustion fan: pushes air through the burner and exhaust out through the vent.
• Igniter: lights the burner every time hot water is called for.
• Freeze protection: small heating elements that warm internal parts in cold weather.
• Controllers and pumps: wall controllers and, on some models, a built-in recirculation pump.

Problems that start with power

A tripped outlet or breaker. Garage and outdoor outlets are often GFCI-protected, and moisture, a failing component or a wiring fault can trip them. The heater goes dark and the taps run cold.

A loose plug or worn outlet. A cord that has worked partly free, or an outlet with tired contacts, can produce shutdowns that come and go with no obvious pattern.

Surges. Control boards are sensitive electronics. A nearby lightning strike or a surge when utility power returns can blow a fuse on the board or damage the board itself, which is why a surge protector suited to the appliance is a common recommendation.

Outages. Without power the unit produces no hot water and its freeze protection stops. Some models show a code or need a reset once power is back.

How an electrical fault is diagnosed

The technician starts at the source: voltage at the outlet, correct polarity and a sound ground. Flame sensing on many gas units relies on a good ground, so a wiring problem can show up as an ignition failure rather than a dead display. Next come the board's fuse and wiring connectors, then the fan, igniter and freeze-protection elements, each tested before anything is replaced. If the outlet or circuit itself is at fault, we will tell you plainly so an electrician can correct it.

Typical repairs

• Replacing a blown board fuse, after finding what made it blow.
• Replacing a damaged control board when the part is still available for the model.
• Replacing a failed fan motor, igniter or freeze-protection element.
• Repairing a damaged wiring harness or connector inside the cabinet.

When a board for an older unit is discontinued, a surge can end the heater's life, and replacement is the practical answer. Some households then compare a storage tank through our gas water heater installation or electric water heater service.

Backup power and restarting after an outage

Some owners keep the heater running during outages on a generator or battery system. Power quality matters to sensitive boards, so check what the manufacturer permits before connecting one. When the grid comes back, confirm the display is lit, run a hot tap and note any code before resetting. In freezing weather, follow the manual's draining steps if the outage will last.

Replacing the heater: Lithonia permits

Lithonia's permit checklist lists water heater replacement among the jobs that need a permit. The City of Lithonia Building and Permitting Division handles the application and the inspection, and permits generally go to contractors who hold a license, or to an owner who lives in the home and files a homeowner affidavit.

Questions about power problems with tankless heaters in Lithonia

Why did my tankless heater stop working after a thunderstorm?

Storms bring surges and outages, and both affect the electronics. Start by checking the outlet, any GFCI reset button and the breaker. If the display stays dark with power present, a fuse on the control board may have blown, or the board may be damaged. Repeated resets will not fix that, so note what happened and have the unit tested.

Can a gas tankless heater be plugged into a GFCI outlet?

Yes, and garage or outdoor installations are often on GFCI-protected outlets. The manual lists the unit's electrical requirements. A GFCI that trips repeatedly is telling you something, such as moisture in a connection or a failing component, so the trip should be investigated rather than bypassed with an extension cord or a different outlet.

Does a gas tankless heater use much electricity?

Not much by household standards. The board, fan and igniter draw modest power while the burner runs, and the freeze-protection elements add a little more in cold weather. Electric tankless heaters are a different matter entirely, since they use electricity for the heating itself and need large dedicated circuits.

Information to have on hand

Tell us whether the display is lit, what code it shows, whether a storm or outage came first and what kind of outlet the heater uses.

Dark display or cold taps after a storm in Lithonia? Phone Alpha Plumbing and Sewer at (404) 409-4448 and we will start with the power side.