How to remove the sight glass on Whirlpool water heater?

Removing the sight glass from a Whirlpool water heater is a relatively straightforward process, but it's important to follow the necessary steps carefully to ensure safety and proper reassembly if needed. The sight glass on a water heater is typically used to visually check the water level or condition inside the tank. Before you begin, please note that working on water heaters can be dangerous, and if you're not comfortable with the process, it's best to consult a professional plumber.

Here are the steps to remove the sight glass from a Whirlpool water heater:
Safety Precautions:
Turn off the power supply: If your water heater is electric, switch off the circuit breaker or disconnect it from the power source. For gas water heaters, turn off the gas supply valve.
Allow the water heater to cool: The water inside the tank can be extremely hot, so it's crucial to let it cool down before attempting any maintenance.
Gather Your Tools:
To remove the sight glass, you'll need a few tools, including a pipe wrench, adjustable pliers, and a bucket or towels to catch any water that may spill during the process.
Locate the Sight Glass:
The sight glass is typically located on the side of the water heater tank, near the bottom. It consists of a small glass or plastic window with a threaded fitting.
Drain the Water Heater:
To prevent water from spilling when you remove the sight glass, it's a good idea to drain some of the water from the tank. Attach a hose to the drain valve at the bottom of the tank and open it to release a few gallons of water into a bucket or drain.
Disconnect the Sight Glass:
Use a pipe wrench or adjustable pliers to carefully loosen and unscrew the sight glass fitting from the tank. Be cautious not to apply excessive force, as this can damage the threads or the tank itself. If the sight glass is stuck, you may need to use penetrating oil to loosen it.
Remove and Inspect the Sight Glass:
Once you've unscrewed the sight glass fitting, gently pull it out from the tank. Inspect the sight glass for any damage or sediment buildup. If it's damaged, you'll need to replace it.
Clean and Replace:
If the sight glass is reusable and in good condition, you can clean it thoroughly before reinstallation. Use a soft brush or cloth to remove any sediment or buildup. If it's damaged or worn, replace it with a new one of the same size and type.
Reinstall the Sight Glass:
Apply plumber's tape (Teflon tape) to the threads of the sight glass fitting to create a watertight seal. Carefully screw the fitting back into the tank by hand, and then use the pipe wrench or adjustable pliers to tighten it snugly. Be cautious not to overtighten and risk damaging the threads.
Refill and Restore Power:
Close the drain valve and slowly open the cold water supply valve to refill the tank. Once the tank is full, turn the power supply (electric) or gas supply (gas) back on.
Check for Leaks:
Inspect the sight glass fitting for any leaks. If you notice any, tighten it further or apply more plumber's tape if necessary.

In conclusion, removing the sight glass from a Whirlpool water heater involves turning off the power supply, draining some water from the tank, disconnecting the sight glass fitting, inspecting and cleaning the sight glass, and then carefully reinstalling it with the proper precautions. If you are unsure about any step or encounter difficulties, it's always recommended to seek assistance from a qualified plumber to avoid any potential hazards or damage to your water heater.