Tankless Water Heaters

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Tankless Water Heater Repair & Installation
in DC, Maryland & Northern Virginia

Tankless water heaters are a modern, more efficient alternative to traditional storage tank water heaters. They provide your home with endless hot water while still reducing energy costs by only providing it on demand. Their compact design saves space, and their durable construction means a longer lifespan compared with conventional systems.

In the D.C., Maryland, and Northern Virginia area, John C. Flood has been a trusted HVAC expert for over 120 years. We deliver full-service installation, repair, and maintenance for all major tankless water heater brands. Whether you’re upgrading your home’s entire HVAC system or addressing an existing issue, John C. Flood guarantees reliable performance and expert care.

Benefits of Tankless Water Heaters

Tankless water heaters are an excellent option for homeowners who want reliable hot water and reduced energy costs. Their advanced design delivers several advantages over traditional tank systems.

Key benefits of tankless water heaters include:

Continuous, on-demand hot water.
Compact design to free up valuable space.
Energy efficiency: only heats water when needed, reducing utility costs.
Longer lifespan, often up to 20 years.
Lower risk of leaks or tank corrosion.

Tankless vs. Traditional Water Heaters

In addition to the everyday buildup we discussed, there may be more serious underlying issues with your plumbing system. Tree roots, for instance, can break through underground pipes through tiny cracks or joints, gradually expanding and blocking water flow. Pipe corrosion, often caused by age or chemical reactions with water, can lead to rough interior surfaces where debris easily catches and accumulates. Other structural problems, such as pipe collapse, shifting soil, or improper installation, can also restrict drainage and cause recurring clogs. These deeper issues nearly always require professional inspection and repair to prevent extensive damage and restore proper plumbing function.

Feature	Tankless Water Heater	Traditional Water Heater
Hot Water Supply	Continuous, on-demand	Limited to tank capacity
Size	Compact, wall-mounted	Large, takes up floor space
Energy Use	Heats only when needed	Maintains full tank temperature continuously
Lifespan	Up to 20 years	10–15 years
Maintenance	Lower risk of leaks/corrosion	Higher risk of leaks and rust buildup

Tankless Water Heater Installation Services

Unlike installing standard water heater units, tankless systems require specialized gas line connections, properly designed venting, and water line configurations built for on-demand heating. These differences are there to ensure the system delivers consistent, efficient hot water while maintaining safety standards.

When considering installation, homeowners should focus on the following factors:

Proper unit sizing: Select a system that meets your household’s hot water demand for consistent performance.
Correct venting and electrical setup: Proper ventilation and electrical connections prevent safety hazards and maintain efficiency.
Integration with existing plumbing systems: Seamless compatibility helps avoid leaks, pressure issues, or unnecessary modifications.

Improper installation can reduce efficiency, shorten your water heater’s lifespan, or even void the manufacturer’s warranty. John C. Flood’s licensed plumbers are qualified to handle every step of your tankless water heater installation with precision. We guarantee code-compliant installation and optimized system performance for your home in the DMV area.

Tankless Water Heater Repair Services

Just like any home water heater system, tankless units occasionally require repairs to maintain reliable performance. As soon as you notice an issue, call a professional repair service to maintain consistent hot water and to prevent minor problems from becoming costly damage.

Any one of the signs below may mean your tankless water heater needs attention:

Fluctuating water temperature: Water suddenly becomes too hot or too cold.
Error codes on the display panel: System alerts indicate specific malfunctions.
Low water pressure: Reduced flow can signal internal blockages or valve issues.
Ignition failure or gas supply issues: The unit may fail to start or maintain heat.
Mineral buildup: Scale accumulation can reduce your system’s efficiency and damage internal components.

Repairs should always be handled by trained professionals. Attempting DIY fixes can harm delicate sensors and electronic components. John C. Flood’s licensed and experienced technicians are prepared to safely diagnose and repair all major tankless water heater brands and models for your home.

Tankless Water Heater Maintenance

It takes only a few simple steps to perform annual maintenance that will keep your tankless water heater running efficiently and extend its lifespan. Regular service helps guarantee consistent performance so you can avoid costly repairs.

Typical maintenance steps include:

Flushing mineral buildup: Removes scale, especially in hard-water areas like the DMV, to maintain heating efficiency.
Checking gas pressure, valves, and ventilation: For safe operation and to prevent combustion or flow issues.
Inspecting sensors and electrical components: Verifies all electronics are functioning correctly for optimal performance.
Testing system flow and performance: Confirms the unit delivers consistent hot water and meets household demand.

John C. Flood’s trained technicians handle each step thoroughly, keeping your tankless system safe, efficient, and ready to provide endless hot water.

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Providing Comfort to Families for over 120 Years

The plumber and electrician they sent were knowledgeable, professional, and equally as important, full of integrity. While they presented various options, they did not try to sell me something that I did not need. I would highly recommend them, the company has come a long way and I appreciate the service men they sent.

The technician helped me with my water heater. He researched the part that is needed, order it and I truly hope to see him again on the install soon. He was very knowledgeable and extremely helpful!!!

I have used John C. Flood for plumbing issues 3 times now. Each time, they're very responsive and reasonably priced. Each time, my technician has been Harry Hudson. He has done excellent work for me. Highly recommend the company and the technician!

I had an issue at my rental property over the weekend. John C Flood is a life saver! They sent someone out right away and he was knowledgeable, friendly and worked quickly for our guests. I will be using them again.

I cannot speak highly enough of John C. Flood and specifically Dale Jr. He has repaired my system twice in a moment of crisis and has gone above and beyond to make sure we are happy with the outcome. He takes the time to explain the situation and lays out all the options and processes so clearly so I feel comfortable with what he is doing. The company is excellent at sending people in a timely matter.

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Why Choose John C. Flood
for Tankless Water Heater Service?

The plumbers at John C. Flood are all licensed, insured professionals experienced with tankless systems. We provide honest, upfront pricing and no surprise fees. Our outstanding customer service includes 24/7 emergency availability. No wonder we’ve been trusted by DMV homeowners for over 120 years!

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FAQs About Tankless Water Heater Repair & Installation

How long does a tankless water heater last?

Up to 20 years with proper installation and annual maintenance.

How often should a tankless water heater be serviced?

Yearly maintenance is recommended to flush mineral buildup and inspect components for safe and efficient operation, especially in areas with hard water like the DMV.

Why does my tankless water heater keep shutting off?

Frequent shutdowns might be caused by mineral buildup, gas supply issues, improper venting, or faulty sensors. Professional technicians can safely diagnose and resolve the underlying problem.

Is it difficult to convert from a traditional to a tankless water heater?

Converting requires careful planning, including proper unit sizing, gas line adjustments, venting installation, and plumbing integration. Only a licensed professional can guarantee that your system meets code requirements and performs at optimal levels.