Fixing Rusty Hot Water

Troubleshooting rusty hot water in the electric and gas water heaters. What is the cause of the discolored water and why do I see rusty or brown water coming out of the tap or in the tub?

Reasons for rusty or discolored hot water appearance

With the first signs of the discolored hot water, often found as rusty or brown, many consumers will assume that their gas or electric heater got corroded. So, is the rusty fluid result of the rusty tank or something else is going on?

There are several reasons for the rusty appearance:

Water heater tank corrosion

Rusty waterRusty water (photo: pixabay)

If you look at most of the tank-type heaters today, no matter electric or gas-powered ones, you will see that almost all of them are equipped with the metal tank. The inner surface of the metal tank is exposed to different water conditions, and corrosion is one of the problems that can occur.

To prevent corrosion and rusty tank, the manufacturers will cover the tank with the glass-porcelain coating treated with the high temperatures. Such a technology prevents the tank from rusting. The anode rod is another element that is used to protect the metal components from corrosion.

If for any reason, the glass lining is cracked, hot water can get in touch with the metal, start the chemical reaction and after some time corrode the tank. Every time during the hot water draw, water will get in contact with the rusty spots developed on the tank, get contaminated and change the color to brown.

Rust particles and dirt from the water supply can also accumulate on the bottom of the water heater. When you turn the heater on, sudden move stirs up the water, making the hot water brownish at the tap.

Bacteria as the result of the rusty hot water

The iron-reducing bacteria, which is usually found in the soil, wells and water distribution systems is the bacteria that can make water have a rusty look. Soluble iron is food for bacteria, which will, with the lack of oxygen and no water movement inside the tank, reduce the anode rod efficiency and speed up the corrosion.

Water mains

The main pipeline that is made of cast iron pipe or metal could also rust, delivering stained water to your home when used. To confirm the problem with the municipality water, first check around to see if your neighbors are having the same problem. If other homes are affected, the only thing you can do is to flush your plumbing system for at least half an hour. You can repeat it several times until water runs clear.

There could also be repairs on the main supply line and even bursts down the road. As rust accumulates in water mains, and when hydrants in the area are flushed (or used by firefighters), this will disturb the normal water flow and pick up the rust particles, which will end up in your sink or shower.

Deposits in water

Incoming water might bring clay, mud and sand deposits if your home plumbing is connected to the well system. If there is a break on the central plumbing system, or new houses are built in the area, the dirt, mud, and clay will enter the pipeline system and mix with water, resulting in brown or rusty appearance.

Also, any disturbance of sediments inside the water tank can cause brown particles appearing in water.

Now, as your heater is between the tap and central plumbing, it will collect the dirt coming from the outside supply pipeline so the hot water will have this rusty or brown color look.

emergency plumber

Rusty pipes

If the brown water is coming from the cold water tap, rusty pipes should be blamed. Rust usually forms sediments that settle on the bottom of the pipes. Once the pressure inside the pipe changes (increases) or something else stirs up, eventually they will appear at the tap. The best solution is to replace a deteriorating pipe.

If your plumbing is using galvanized pipes, they could corrode over time. However, if the plumbing consists of copper or plastic tubes, then you should look for the cause somewhere else.

Pipes can also rupture, so dirt can slowly get inside, contaminate the water, and making it look rusty.

Universal solution for the rusty hot water

One of the solutions for the rusty hot water, excluding hard conditions such as a rusty tank, is to drain and flush the tank thoroughly through the drain valve. If the heater tank and plumbing system are infected with the bacteria than shock therapy with the chlorine, followed by flushing, should be applied.

Most of the time heaters are blamed for the rusty hot water and other changes in color. Keep in mind that both electric and gas-powered heaters are built with the quality tank glass lining, so it is rare to see cracks in the lining that will allow water to contact the metal tank and get corroded.

If your water heater is over 10 years old and hot water comes out brown often, it is time to replace it.

Conclusion

Most of the time rusty hot water is not harmful if you want to shower or brush your teeth, but it is not recommended to drink, and it can discolor dishes and clothes. It is not appealing to see, and it can smell and taste bad. To prevent further and more series problems, it should be taken care of on time. Water heater manufacturers recommend regular maintenance, such as flushing, to clean out the sediments and rust, ensure better performance and at the same time extend the life of the unit.

emergency plumber

Related

Enter Your Title (ex. rotten egg smell)

Please describe the problem in details including the type of water heater and brand/model.

What Other Visitors Have Said

Click below to see contributions from other visitors to this page...

Brown water in hot water supply Not rated yet
We have brown water in our hot water system. This only happens first thing in the morning for a few seconds then seems to be fine. Our hot water tank is …

Click here to write your own.

> > How to repair rusty hot water

Popular articles

Recommended stores

The Home Depot Logo