Step 3 · Preparation and System Shutdown
Locate the main water shutoff valve for the house and turn it clockwise until it is fully closed. To drain the entire plumbing system, open all faucets, starting with the highest fixture in the house (e.g., an upstairs shower) and ending with the lowest (e.g., a basement sink or outdoor spigot). Let the water run until it stops. For safety, shut off the electrical breaker or the gas supply valve for your water heater. Place a bucket and towels under the water heater's drain valve and open it to drain the tank.