When the ambient temperature is close to 0 ℃, in order to prevent the water heater in the water and ice caused by expansion of water pipes rupture, must be done antifreeze work. Ordinary models using manual drainage antifreeze method; antifreeze models have been equipped with automatic heating antifreeze.
The device will automatically heat when the temperature is below a certain temperature (but the ambient temperature of the water heater will drop below -15 ℃, the device may not be able to protect it. Please use the antifreeze method.) To prevent freezing, but to ensure that the electricity
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