How to Flush a Water Heater Safely (Step-by-Step)

Regular flushing can reduce sediment, cut noise, and improve efficiency—especially in hard-water areas.

Safety First

• Turn gas to “pilot” (or off) on gas models; power off at breaker for electric.

• Let water cool to avoid scalding. Wear gloves and eye protection.

Steps

1. Shut off cold supply to the heater.

2. Attach a garden hose to the drain valve; run hose to a floor drain or outdoors.

3. Open a hot water faucet in the house to relieve pressure.

4. Open the drain valve and let the tank empty.

5. Pulse-flush: Close the drain, open cold supply for 10–15 seconds, then drain again. Repeat until water runs clear.

6. Close drain, remove hose, open cold supply, and let the tank fill.

7. When water flows steadily from the open hot faucet, close it.

8. Relight or restore power and set temperature to ~120°F.

If the valve is stuck, the drain is clogged, or you see heavy rust/debris, pause and call a pro—forcing it can cause damage.

Maintenance tip: Flush annually (or per manufacturer guidance). Consider anode rod checks every 2–3 years.

Need help? Book a professional flush—quick, clean, and compliant.