Attach a garden hose to the drain spigot and run the hose outside or into a toilet or sink. Open the spigot and drain the tank until the water runs clear. You could have turned off the water heater beforehand so as to reduce the risk of scalding yourself.
You should drain the tank as recommended by the manufacturer. If not, lime scale forms and insulates the bottom of the tank and causes the water heater to use more energy because it cannot heat the water efficiently.
It is probably sediment from the hot water heater, you may need to flush out the hot water heater tank, all it takes is a garden hose.
According to DIY on Hot Water Promblems if theres not enough water then you hit the reset button. If the water is too hot then change the temperature and reset. If you have a leaky heater then you need to replace the valve. If you have a rusty tank then you need to replace the water heater. If you have a noisy heater then you need to drain and flush the tank. If you have dirty water then drain and flush the tank and do it on a regular basis.
It would help as most of the rust accumulates at the bottom of the tank.
Toilet tank
The hot water tank might be undersized for your usage.
take the tank off and flush it out with a water hose...
It is probably best to drain and flush the tank.
do they help with hot water tank replacement
how long does it take for hot water after lighting water tank its gas?
No, a hot water tank heats water by itself.
If your water comes from a well and you have your own pump and tank. The tank may be waterlogged.
So the steam can rise from the boiler to the hot water tank storage