How to Clean a Tiger Water Heater?

To clean an electric Tiger water heater (3.0L or larger), use citric acid.

Here's the process:

1. Boil Citric Acid Solution: Boil one pot of water with one bag of citric acid (30g).
2. Rest: Let the solution sit in the water heater for 6 hours after boiling.
3. Drain: Pour away the citric acid solution.
4. Rinse (If Necessary): If you notice any lingering odors, boil water one or two more times to rinse the water heater.