Always turn off the power to electric water heaters at the breaker and the gas supply for gas models before inspection. Be cautious of hot surfaces and potential water leaks. If you detect any gas odor, leave the area immediately and contact your gas company or emergency services.

For this initial assessment, a flashlight is crucial for inspecting dark areas and potential leaks. A camera or smartphone can be helpful to document any observed issues like rust or corrosion. Keep a pen and paper handy to note down model numbers and observations.

No, the "beginner" difficulty and "1 hour" estimate apply solely to the *assessment phase* of deciding if your water heater needs replacement. Actual water heater replacement is a complex job that usually requires professional tools, significant time (several hours), and expertise, making it an advanced DIY project or best left to a qualified plumber.

The label is typically a sticker located on the side of the tank. If it's unreadable, search online using the water heater's brand and model number; many manufacturers provide online date code decoders. If all else fails, a plumber can often identify the age during a service call.