How do you drain a water heater valve?

Draining a water heater valve involves connecting a hose, opening the drain valve, and opening the pressure relief valve to prevent a vacuum.

Here's a step-by-step guide based on the reference provided:

1. Connect a hose: Attach a hose to the drain valve located near the bottom of the water heater.
2. Start the draining process: Turn on the drain valve to begin draining the water.
3. Open the pressure relief valve: Locate the pressure relief valve (typically on top of the water heater) and open it. This prevents a vacuum from forming inside the tank, which could slow or stop the draining process.