เครื่องทำน้ำร้อนน้ำอุ่น ปลอดภัย ราคาถูก
The reason is it can cause an electrical fault. For the standard quality of the water heater, this switch must be designed to be positioned aside the hot water boiler, not directly underneath the boiler. If the boiler leaks, the hot water should not drop on the switch.
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