1. 6 Liters, outer shell/body design is optional
2. Double ignition pin, automatic electrical pulse ignition device; 1.0kgs heat exchanger in copper
3. Flame failure safety device adopted
4. Over water pressure protection device
5. Water-gas interlock valve device
6. Anti-dry combustion protection device
7. Winter-summer switch option for gas saving
8. Anti-freezing device
9. 20-minute timer is optional
10. Zero water pressure start is optional
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