Draining a water heater can be a messy business. Sometimes homes don’t have drains. Thankfully there are still ways you can drain your water heater with no floor drain.
You’re going to need to find the drain so you can attach a hose that will feed into either a floor drain or, in your case, something farther away like a bathtub or a window.
Most homes use a gas water heater. For safety, turn off the gas source to the water heater and put out the pilot light.
To get the water moving, you’re going to need to open the pressure relief valve as well.
Screwups can be costly. Still, if you’re worried about it, you can always pay a professional plumber to do it the first time around.