1–Prepare the heater for water. Turn off the power if the water heater is gas. Turn off the water by closing the valve onto the cold water line to the water heater. It’s on top of the water heater. Always the cold line is to the right. Open a tap of hot water in the kitchen. Air pressure gets out of the tap. Open the drain valve located at the water heater’s base. This seems like a bibb for the pants. Let out of the water heater a gallon, or more. For the time you work on the water heater, don’t encourage anyone to use hot water.Have a look at Water Heater Review Site for more info on this.
2-Clearance overhead. Anode rods are nearly as tall as water heaters themselves. More often than not, the ceiling is too close to the top of the water heater so that the whole anode rod can be pulled out. That way, raise the anode rod as far as possible. Check to see if they are exposed to any surface flaking or any of their core wire. If not, the anode can then be reinstalled as is. Many issues with the anode rods arise at its peak because that’s where most of the hot water is. If you need an anode rod removed. Bend it against the opening of the water heater in the middle, and pull it out.
3–Pick anodes and delete anodes. Three types of metals are used for making anode rods. It’s magnesium, aluminium, and zinc. You can mount a magnesium anode if you have soft water, obviously. Aluminum is used when you have very hard water or water which is heavily softened with salts. It is strongly recommended to install an aluminum anode after you find your previous anode has degraded. When you mount a magnesium anode after discovering a highly degraded anode, this could cause a negative water reaction and cause pressure to release faucets from the households. If an aluminum anode rod must be mounted, stop using the hot water to cook with.
4-A second anode rod should be added. If your water heater has an exposed hexagonal head on top of it, you can install yet another anode rod for more water heater protection. If the hex-head persists, de-screw the socket for hot water. It is the pipe to the left at the top of the water heater. That is where a hybrid anode rod can be mounted. Make sure the anode rod has a 2 to 6 inch brass nipple. Hire a plumber to do this, or look in my article on anode rods for information. Warning: It could be quite a challenge to add a second anode.
5-Take off sediment. There are three signs in your tank that you have buildup of sediments: a lower burnout factor if you have an electric water heater, a lot of noise if you have a gas water heater, or a foul odor from both types of water heaters. If the sediment piles up high enough, it will cover the lower heating element in an electric water heater and is unable to heat water. If your hot water suddenly starts running out long before it used to and you’ve got an electric water heater then it’s likely to build up sediment. At the rim, where the flame heats the burner plate, gas water heaters get filled by sediment down. Air is contaminated by mud and overheated vapour.
6-Install and flush the water heater with a curved dip tube. Usually it comes with a straight dip tube, when you buy a water heater. The dip tube is the section of plastic pipe that runs from the top of the cold water inlet of the water heater to the bottom of the water heater. It’s job to get the coldest water close to the bottom where it can easily heat up. Sediment is formed at the bottom of the water heater and is not moving at all except in the small portion of the water heater where the dip tube extends to the bottom. The water which comes out of the tube pushes away the sediment. It is also impossible to try to wash the sand out of the drain valve at the outside of the water heater. Installing a curved dip tube where the tube’s bottom curves to an angle of ninety degrees, causes the water heater’s bottom to be swept by the cold water coming in.
7-Remove the mud from a muck vortex. Use this tool to employ a plumber to remove the sediment from your water heater. The tool is costly and requires some knowledge about how to use it.