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Before buying, determine whether or not or no longer you wish a high-temperature delivery or a low-temperature start. High temperature start: When the temperature reaches the set temperature, switch on the flexibility to begin the device. (For example, when it reaches eighty degrees, turn on the ability of the circulating pump) Low temperature start: When the temperature reaches the set temperature, convey to an end the power to show off the device. (eg, attain eighty degrees, flip off the heater) The threaded interface is a 4-point outdoors thread interface. The diameter of the exterior thread is set 20mm.