Schedule professional water heater service once a year. Tank models need the tank flushed, the relief valve tested, and the anode rod inspected. Tankless models need descaling at the interval in the manufacturer’s handbook, which is usually shorter in hard water. Do not wait for symptoms to appear.
Most people think about their water heater twice: when they buy it, and when the shower runs cold. The years in between are when sediment piles up in the tank, the anode rod wears away, and a safety valve that has never been tested waits for the day it is needed. So how often should you schedule water heater service? For most homes, once a year. A few exceptions depend on the type of heater and your water.
This guide gives you a schedule you can actually follow. It covers what each visit should include, how tank and tankless units differ, and what changes if your water is hard. It also lists the warning signs that mean you should not wait for the next appointment. Dees Plumbing and Heating provides residential plumbing across Dracut and nearby towns, and our technicians work on both tank and tankless units. You do not need to know how your heater works. You only need to know which type you own and how long it has been since anyone looked at it.
The Short Answer: Once a Year for Most Water Heaters
A yearly visit is the interval a major manufacturer builds its annual water heater maintenance checklist around, and it applies to tank and tankless units alike. A good visit covers:
- A check for leaks at the tank, fittings, and base
- Flushing the tank to remove sediment (tank models)
- Testing the temperature and pressure relief valve
- Inspecting the sacrificial anode rod
- Checking the venting and air intake on gas models
- Confirming the thermostat is set to 120 degrees Fahrenheit and the electrical connections are tight
Your owner’s manual comes first. If it sets a different interval for your model, follow it.
How Often to Service a Tank Water Heater
A tank heater has three parts that need attention on a schedule.
Flushing. Minerals in the water settle at the bottom of the tank as sediment. Flush the tank at least once a year, and more often if your water is hard. You can often hear the problem before you see it, as popping or rumbling when the burner or element runs.
The relief valve. The temperature and pressure relief valve stops the tank from over-pressurizing. The manufacturer’s guidance is that you test it once a year and that a professional inspects it every five years. If the discharge pipe drips, the cause is usually high water pressure or a missing thermal expansion tank, not a bad valve. Replacing the valve alone does not fix that.
The anode rod. The rod corrodes on purpose so the steel tank does not. How fast it wears depends on your water chemistry, how much hot water you use, and whether you run a water softener. Have it inspected once a year. Replacing a worn rod is far easier than replacing a tank that has rusted through.
How Often to Service a Tankless Water Heater
A tankless heater has no tank, so there is nothing to flush in the usual sense. It still needs service. Minerals in the water form scale inside the narrow heat exchanger, and many tankless models need periodic descaling to keep it clear. The right interval depends on the model, so follow the manufacturer’s handbook. The inlet filter also needs a look now and then to keep debris out.
For Navien tankless water heaters, Dees Plumbing and Heating recommends annual professional maintenance, with more frequent descaling where the water is hard. That visit includes descaling, inspecting key components, cleaning the heat exchanger, and testing the safety controls.
What Changes Your Schedule
Three things move your interval up or down.
Water hardness. Hard water builds sediment and scale faster. Your water supplier publishes an annual water quality report that shows what is in your water. If the water is hard, shorten the flush or descaling interval.
Hot water use. A busy household with long showers, daily laundry, and a dishwasher puts more wear on a heater than a household of one or two. Heavy use also wears the anode rod faster.
History. A heater that has never been flushed needs more care, not less. Sediment that sits for years can harden and block the drain valve, which makes flushing harder. If a heater has gone years without service, let a plumber handle the first one.
Signs You Should Not Wait for the Next Service
Call sooner if you notice any of these:
- Popping, banging, or rumbling from the tank
- Rust-colored or cloudy hot water
- Hot water that runs out faster than it used to
- A drip from the relief valve discharge pipe
- Water around the base of the heater
Water at the base is the urgent one. Turn off the power or gas, shut off the cold water supply to the heater, and call. Dees Plumbing and Heating offers emergency plumbing around the clock for leaks that cannot wait. For other symptoms, our post on water heater repair in Dracut explains what each one usually means.
What You Can Do Yourself, and What to Leave Alone
Many homeowners can flush a tank heater by following the manufacturer’s instructions. Turn off the heat source, connect a hose to the drain valve, and drain the tank until the water runs clear. Let the water cool first, because it can scald.
Call a plumber instead if you are not comfortable working with gas or electricity, if the drain valve is clogged and will not open, or if you own a tankless unit. Tankless descaling needs the right equipment and the manufacturer’s procedure. A local plumbing and heating company in Dracut, MA can also handle the first service on a heater that has been ignored for years.
Pair It With Your Heating Tune-Up
If you already book a yearly boiler or furnace tune-up, put the water heater on the same calendar reminder. One fall appointment is easier to remember than three separate ones, and it keeps you ahead of the winter rush.
Schedule Your Water Heater Service in Dracut
Annual service is the simplest way to protect a water heater you depend on every day. Dees Plumbing and Heating services tank and tankless units across Dracut and nearby towns. Contact Dees Plumbing and Heating to set up your yearly visit, or call now if your heater is already showing warning signs.
FAQs
How often should a water heater be serviced?
Once a year for most tank and tankless water heaters. Follow your owner’s manual if it sets a different interval for your model.
How often should you flush a water heater?
Flush a tank water heater at least once a year. In hard water areas, flush it more often, because sediment builds up faster.
Do tankless water heaters need to be flushed?
Tankless units have no tank to flush, but many need descaling to remove mineral scale from the heat exchanger. The interval depends on the model, so check the manufacturer’s handbook.
How do I know if my water heater needs service now?
Popping or rumbling noises, rusty hot water, running out of hot water faster, a dripping relief valve pipe, or water around the base all mean it is time to call.
