depends if you are using any detergents some say cold some say hot and some say in the pot nine days old if I was you I would use hot then cold and then hot and cold because then it would expand and contract and hopefully loosen up all the debris and if its a water heater core I would use white vinegar.
To properly flush a gas hot water heater, follow these steps: Turn off the gas supply to the water heater. Shut off the cold water supply to the heater. Connect a garden hose to the drain valve at the bottom of the heater. Open a hot water faucet in the house to allow air into the system. Open the drain valve and let the water flow out through the hose. Flush the tank until the water runs clear. Close the drain valve, remove the hose, and turn on the cold water supply. Once the tank is full, turn on the gas supply and relight the pilot light. Remember to follow the manufacturer's instructions and safety precautions when flushing your gas hot water heater.
By Andreina Urdaneta A clean water heater will heat and maintain water better and last longer. Once a year, flush your water heater, and in extreme hard water areas, at least twice a year. If you feel up to the challenge, here are some tips to help you in a basic cleaning. 1 Turn the water heater and the cold water supply to the water heater off. 2 Hook a high-quality garden hose to the drain valve, and place the other end in an area where hot water will not cause damage. 5. Open the drain valve. 6. Disconnect the cold water pipe on the top of the water heater. This step will let air into the water heater so it will drain. When the water heater is empty, close the drain. 8. Pour tile cleaner into the cold water, leave for a couple of hours and drain the detergent out of the tank. 10. Reconnect the cold water supply to the water heater. Open the cold water valve and let the water heater flush for a couple minutes. 12. Close the drain valve and open the hot water faucet nearest to the tank, and let the water heater fill. 13. When water starts to come out of that faucet, reopen the drain and let the water heater continue to rinse. After all the air is out of the water heater, turn it back on. Take care of your water heater, and it will take care of you. If you keep ignoring the task, your water heater may just leave you in the cold.
To properly flush an electric water heater for optimal performance and efficiency, follow these steps: Turn off the power to the water heater. Shut off the cold water supply to the heater. Connect a garden hose to the drain valve at the bottom of the heater. Open a hot water faucet in the house to allow air into the system. Open the drain valve and let the water heater drain completely. Close the drain valve and refill the tank with cold water. Turn on the power to the water heater and let it heat up. Repeat this process every 6-12 months to remove sediment buildup and maintain efficiency.
To properly flush a Rheem tankless water heater, you will need to turn off the power and water supply to the unit. Connect a hose to the hot and cold water valves, then open the valves to allow water to flow through the unit and flush out any sediment or debris. Repeat this process until the water runs clear. Finally, disconnect the hose and restore power and water supply to the unit.
You should have a hot water heater for the kitchen for sure and also to have for the bathrooms. I personally like to wash my hands in hot water not cold.
To turn off the cold water supply to the water heater, locate the shut-off valve on the cold water pipe connected to the water heater. Turn the valve clockwise to close it and stop the flow of cold water to the heater.
Check piping. Make sure cold line going into cold side of water heater and hot side coming out hot side. Cold feed for water heater should come off main cold line. Make sure valves are open to and from water heater.
The two pipes going into the heater should be marked with either Hot and Cold or a H and C. There should be a shut off valve on the cold side, but sometimes there is one on both sides. If the piping is visible, you can follow one or the other to where it comes into the house. The water heater is usually the first thing the water line runs to.
cold
You should check and adjust the heating temperature, then turn on the cold water to fill the tank.
To drain and flush a water heater effectively, follow these steps: Turn off the power or gas supply to the water heater. Connect a garden hose to the drain valve at the bottom of the water heater. Place the other end of the hose in a safe drainage area, like a floor drain or outside. Open the pressure relief valve on the water heater to allow air in and help with draining. Open the drain valve and let the water heater drain completely. Close the drain valve and remove the hose. Fill the water heater with cold water to flush out any remaining sediment. Repeat the draining process if necessary until the water runs clear. Close the pressure relief valve and refill the water heater. Turn the power or gas supply back on and monitor the water heater for any leaks. Remember to follow the manufacturer's instructions and safety precautions when draining and flushing your water heater.
To drain and flush a water heater properly, follow these steps: Turn off the power or gas supply to the water heater. Connect a garden hose to the drain valve at the bottom of the water heater. Place the other end of the hose in a safe drainage area, like a floor drain or outside. Open the pressure relief valve on the water heater to allow air in and help with draining. Open the drain valve and let the water heater drain completely. Close the drain valve and remove the hose. Fill the water heater with cold water to flush out any remaining sediment. Repeat the draining process if necessary until the water runs clear. Close the pressure relief valve and refill the water heater. Turn the power or gas supply back on and monitor the water heater for any leaks. Remember to follow the manufacturer's instructions and safety precautions when draining and flushing your water heater.