Does a Water Heater Need Yearly Maintenance?
Yes. A tank water heater should be flushed once a year, and in our experience the tanks that get flushed on schedule outlast the ones that never do.
No flush is ever guaranteed to go smoothly. What changes is the odds, and they shift a long way in your favor on a heater that has been maintained from the start.
Most homeowners find out their water heater needed attention on the day it stops making hot water. Flushing is the one piece of maintenance that changes that timeline.
The average tank water heater lasts ten years. Maintenance is what decides whether yours lands at the front of that range or the back of it.
What the flush is actually removing
Sediment. It settles out of the water, collects in the bottom of the tank, and stays there until something takes it out. Flushing is what takes it out.
You can tell how long a heater has gone without one by what comes off the hose. A tank that gets flushed every year runs clear. A tank that has never been flushed drains slushy, a sandy looking sediment suspended in rust colored water. That is what has been sitting in the bottom of your water heater the entire time it has been in the house.
None of it leaves on its own. Every year that goes by without a flush is another year of it building up down there.
Why the window closes
Here is the part that decides everything else on this page. A tank that goes long enough without a flush can reach a point where it cannot safely be flushed at all.
People assume the risk with an old water heater is that the drain valve will not seal back up afterward. That is not what we run into. The problem is getting it open in the first place.
A lot of water heaters that have never been flushed have an impacted drain. Sediment has packed into the valve and it will not pass water. Opening it accomplishes nothing, and a true flush at that point means the drain valve has to come out and be replaced.
What we try first
An impacted drain is not automatically the end of it. There are things worth attempting that carry no risk to the tank, and we work through those before we call it. Blowing compressed air back through the drain will sometimes break up the sediment block and get it passing water again, and once it passes water the flush goes ahead normally.
That is what the diagnostic charge pays for. Not a look and a shrug, but the attempts that might save the tank a trip toward replacement.
Where we stop
What we will not do is force the valve body. If the sediment will not clear and the only remaining option is to break a seized drain loose, that is the end of the visit.
Plastic drain valves are the worst case
If your heater came with a plastic drain valve, the squared edges a wrench is supposed to grip round off very easily. Once they are rounded, the valve body cannot always be broken free at all. There is no technique that fixes that, and there is no way to know before putting a wrench on it.
We would rather tell you no than turn your maintenance call into a replacement you did not budget for.
What it costs
If we get there and the drain is impacted, there is no flush and no flush charge. There is a $100 diagnostic for the trip and the time, and you get a straight answer about where that water heater stands and what your options are.
What this means if yours has never been flushed
It means the sooner the better, and it means going in knowing it might not be possible.
We are not going to tell you it is hopeless without looking. Plenty of neglected tanks still have a drain valve that opens fine. But if yours does not, the answer is not to force it.
This is the entire argument for flushing on schedule from the day the heater goes in. It is not only about the sediment. It is that maintenance stays possible on a tank that has always had it, and stops being possible on one that never did.
Once a year, and when that is not enough
Once a year is the answer for every house we work in, on city water and on a well.
There is one exception. On a well carrying a lot of sand, six months is on the table. But at that point flushing twice a year is treating the symptom, and the conversation we would rather have is about sediment filtration.
Two ways we handle sediment before it reaches the tank
Spin down filters. A screen filter that is cleared out by opening a valve at the bottom. Nothing to buy and replace, and you can service it yourself.
Two and three stage sediment filters. More filtration in stages, for water carrying more than a spin down is going to keep up with.
Either one takes load off the water heater and off every other fixture in the house at the same time.
Common questions
Can I flush my water heater myself?
On a heater that has been flushed regularly, it is a reasonable homeowner job. On one that has not, the risk is that you open a drain valve that will not pass water and cannot be closed back down cleanly, and now the problem is worse than when you started. If the heater has never been flushed, it is worth having someone there who can finish it.
How long does a flush take?
On a tank with a working drain valve it is a short visit. If the drain turns out to be impacted, the visit ends there rather than turning into a bigger job.
What if the drain valve will not open?
We try to clear it first. Blowing compressed air back through the drain will sometimes break up the sediment block, and if it starts passing water the flush goes ahead as normal. What we will not do is force a seized valve. Snapping a drain off a tank full of water turns a maintenance call into a water heater replacement. If it cannot be cleared, there is no flush charge, a $100 diagnostic applies for the trip and the time, and we will tell you plainly what we think that heater has left in it.
My water heater is nine years old. Is it too late?
Not necessarily, and it is worth finding out. Plenty of older tanks still have a drain valve that opens without a fight. If yours does not, that is worth knowing too, because it tells you the tank is closer to the end of its useful life than the calendar does.
Do you descale tankless water heaters?
Yes. A tankless descale is $250.
We do not use a chemical descaler. A tankless unit is plumbed into the water you drink, cook with, and bathe in, and we would rather not introduce a chemical cleaning agent into that system even though it gets flushed back out afterward. We circulate a vinegar and water mixture instead. It pulls the scale and debris out of the heat exchanger just as effectively, and there is nothing in it we would not want coming back out of a faucet.
What areas do you serve?
TennCo. Plumbing serves Benton, Carroll, Henry, Henderson, and Decatur counties, including Camden, Paris, Lexington, Jackson, Milan, Medina, Waverly, Savannah, Carroll County, and Decatur County.
When it is past maintenance
Flushing keeps a healthy tank healthy. It does not bring back one that is already failing. If yours is leaking, running out of hot water early, or making noise it did not used to make, that is a different conversation. We cover the warning signs and what replacement costs on our West Tennessee water heater page.