Wattage by Type
- Storage: 5L about 1200-1500W, 6L 1500-1800W, 10L 1800-2200W — all fine on 10A sockets.
- Instant: 5500-7000W — requires a 16A dedicated line, 2.5mm² copper and its own breaker.
High Wattage Is Not High Cost
A 6L/1500W storage unit heats one tank in ~15 minutes (0.3 kWh) and loses 0.5-1 kWh per day on standby — roughly 1-1.5 kWh daily, or 20-30 CNY a month.
Why Instant Units Draw So Much
With no tank, water must be heated in seconds of flow — hence 5500W+ and strict wiring requirements.
Three Saving Tips
- Switch off when away for long periods.
- Set winter standby to medium.
- Prefer Grade-1 efficiency models with thicker insulation.