A tankless hot water heater gives you endless hot water and lowers energy bills. These systems are built to last over 20 years under ideal water conditions. But that lifespan only happens if you actively care for the system.
Without regular upkeep, your plumbing system works harder and wastes energy. It eventually breaks down and leaves you needing costly repairs. If you want to keep your hot water flowing safely and avoid a cold shower, you must prioritize this upkeep.
Keep Hot Water Flowing With Regular Maintenance
Here is your quick reference guide to what needs checking and who should do it.
| Maintenance Task | Frequency | Who Does It |
|---|---|---|
| 💧 Inlet water filter cleaning | Every 6 months | DIY |
| 🌬️ Air intake filter cleaning | Every 6 months | DIY |
| ✨ Heat exchanger descaling | Annually or every 6 months in hard water | DIY or Pro |
| 🎛️ Pressure relief valve test | Annually | Pro recommended |
| 🔥 Burner and igniter check | Annually | Pro |
| 💨 Venting inspection | Annually | Pro |
| 🔍 Exterior check for leaks | Annually | DIY or Pro |
How to Handle Routine Maintenance Tasks
Understanding the actual process takes the mystery out of maintenance. Let’s break down what these tasks look like in real life and where to find each component on your system.
Cleaning the Inlet Water Filter and Air Intake Filter
Keeping your system healthy starts with two small filters. You will find the water inlet screen near the bottom of the unit. This screen blocks dirt and debris before they can reach your plumbing. If you run a gas heater, you also have an air filter up top to stop dust from getting inside the burner area.
You do not usually need tools to reach them. Just pull the screens out and give them a good rinse in the sink before sliding them back into place. Spending five minutes on this every six months is the easiest way to keep your water pressure high and avoid safety issues.
Descaling Heat Exchangers
The heat exchanger is the core component that does all the heavy lifting inside your heater. It quickly heats your water, but fills up with hard mineral deposits over time. Clearing out that buildup requires a process called descaling or flushing.
A plumber will connect a pump and a hose to your system and push a strong liquid cleaner through the heater. After an hour or two, the hard minerals dissolve completely, and the whole system gets drained and rinsed.
Testing the Pressure Relief Valve
To keep pressure from building up too high, your unit has a safety switch called a pressure relief valve. You will usually spot it on the side or bottom of the heater. Testing it is a simple yearly task.
Just place a bucket under the pipe and briefly lift the little metal lever. Water should shoot out and then stop completely the second you drop the lever. If water leaks from the fittings instead, the entire valve needs immediate replacement.
Inspecting the Burner and Venting
Every year, a professional needs to look at the burner assembly that creates the fire and the ignition components that spark the flame. This annual check guarantees everything is burning safely.
While they are at it, your plumber will also inspect the vent lines blowing exhaust outside. Finding and fixing any blockages or cracks is a crucial step for running a safe system.
Why Dallas-Fort Worth Water Quality Makes This Non-Negotiable
Most manufacturer guides tell you to flush your unit every one to two years. But those national guides do not account for North Texas. Water from the North Texas Municipal Water District is incredibly hard.
Calcium and magnesium pile up inside your unit much faster here than in the rest of the country. A yearly flush is the absolute minimum for DFW homeowners.
If your home has extremely hard water, servicing the unit every six months makes a huge difference. Committing to this schedule and keeping your equipment healthy will save the system from a premature replacement.
What You Can Handle versus When to Call a Plumber
Rinsing filters and doing quick visual checks are safe DIY tasks. However, you can only flush the unit yourself if your original installer included special shut-off valves. Without these valves, flushing is not safe.
Anything involving gas lines or the burner must go to a licensed professional. Top brands require professionally documented service to maintain your warranty coverage. Doing major maintenance yourself without proof can void your warranty.
Always log the date and the service type. If your unit is flashing error codes or heating poorly, something is already broken. Check your user manual or look into common heating unit symptoms before calling for a repair.
Temperature Settings and Energy Efficiency
Always check that your water temperature is set to 120°F. Setting the heat higher speeds up scale growth and spikes your energy bills.
For homes using 41 gallons of hot water or less daily, an on-demand household unit is up to 34 percent more efficient than a standard tank. You only get to keep those energy savings if you stay on top of the schedule above.
Get Expert Help for Your Tankless Hot Water Heater
Do not wait for a complete breakdown to get help. Annual maintenance keeps your system running efficiently and extends its life.
Remembering to book your yearly flush is easy when you sign up for our preventative plumbing care program. Members enjoy automated service reminders, priority scheduling, and exclusive discounts on all necessary upkeep.
Call Intown Plumbing at (469) 207-1400. We serve Rockwall, Mesquite, Dallas, and the surrounding area. If you are deciding whether to install a new unit, you can easily explore available continuous heating options to find the perfect fit for your home.
Frequently Asked Questions
What regular maintenance is needed for a tankless water heater?
The most important jobs are flushing the heat exchanger and washing the air and water filters. You also need to test the pressure relief valve. A pro should check the burner assembly and venting. In DFW, flushing out the hard minerals is the most important step.
How often should a tankless water heater be flushed?
National brands say every one to two years, but our local water supply builds up minerals incredibly fast. A yearly flush is the absolute minimum here. If your water tests high for minerals, a twice-yearly flush stops the unit from breaking down early.
Can I flush my tankless water heater myself?
You can only do it safely if your system has an isolation valve kit. Even then, most major manufacturers demand professionally documented service to keep your warranty active. A DIY flush without proof can void your warranty.
What is the most common problem with tankless water heaters?
Mineral scale buildup is the biggest issue in hard water areas. As minerals crust up inside, your hot water gets weak, and the system works way too hard. If left alone, parts overheat and break. Regular flushing is your best defense.
How much does it cost to flush and maintain a tankless water heater?
The price depends on the size of your unit and local labor rates. Call a licensed plumber for an exact quote. Keep in mind that regular maintenance costs a fraction of a massive repair or buying a brand-new unit.
