If this question is pertaining to a electric tank water heater no.
Change water heater element without draining.
In this case i would shut off power turn off water supply and just remove the element as fast as you can knowing you will have some loss.
Use a screw driver to remove the cover of the access panel.
Turn off water to heater or house.
The upper panel houses the upper water heater element.
Replacing the water heater elements will require a few tools.
Gently remove the.
Set the insulation aside in a dry place.
Normally there are two a high and a low elements.
Re leave pressure anywhere you want but when it s gone close the valve sink tub ect remove cover and disconnect wires.
The tank must be fully drained and cooled before you can change the heating element.
It is either that or get a pump and dicon top line and feed tube into tank and use pump to remove water.
If you must change one order both.
There s usually insulation between the panel door and the thermostat.
Turn off power to heater.
Get new heater element ready remove from package put on gasket ect.
The thermostat should have a plastic cover.
This is great and saves a ton of time.
Here is how you change the elements on an electric water heater.
I have viewed some videos on the internet about changing a hot water heater element without draining the tank first.
Put big towel down in front of heater.