Tongyi Air to water heat pump-All in one heat pump Advantages to All in one Heat Pump Water Heater 1. Easy and flexible installation 2. The output heat value up to 4 times as the electric consumption 3. All weather design, no matter in rainy or cloudy days 4. Reliable defrosting technology 5. Less running cost and easy maintenance 6. Hot water tank with built-in or external heat exchanger 7. Comfort water heating system with fully automatic and electronic panel control 8. Match electric water heater according to clients' requirement