Quick Verdict
- Ordinary 10A wiring: choose storage (5L/6L, plug and play).
- New 16A dedicated line available and tight under-sink space: choose instant.
- Renters: a 300 CNY 5L storage unit, removable when moving.
Key Differences
| Dimension | Storage | Instant |
|---|---|---|
| Power | 1200-2200W | 5500-7000W |
| Wiring | Ordinary 10A socket | 16A dedicated line + 2.5mm² copper + breaker |
| Hot water | One tank per fill (~10-20 min reheat) | Endless, on demand |
| Size | Large | Palm-sized |
| Price | 300-1000 CNY | 400-800 CNY (excl. rewiring) |
Why Most Homes End Up With Storage
5500W+ instant units trip old 10A circuits and require a dedicated 16A run from the panel. Most kitchens lack that line, not the vertical space. Storage models match short, frequent tasks like rinsing and dishwashing perfectly.
Three Exceptions Favoring Instant
- Cabinet depth under 30cm — storage tanks do not fit.
- A 16A dedicated line already exists (check the acceptance sheet).
- Concentrated continuous use, e.g. post-dinner dishwashing for a big family.
Unsure about your wiring? Run our Heater Match Check tool before ordering.