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1. Compulsive exhaust digital constant temperaure water heater;
2. The temperature set at will, automatic constant temperature convenient operation.
3. Protection device against unexpected flameout;
4. Burned air expelled compulsively, the air indoors much fresher and safer;
5. Protection device against creepage;
6. Protection device against over wind pressure or flue snarl-up;
7. Start up under low water pressure even 0.02Mpa. Protection function against;
8. Protection device against frozen.
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