本实用新型的烟道中可以设置一组与双层水套相通的横置二次加热管。
A group of horizontal secondary heating pipes communicating with the double-layer water jacket can be arranged in the flue of the hot-water boiler.
本实用新型的烟道中可以设置一组与双层水套相通的横置二次加热管。
A group of horizontal secondary heating pipes communicating with the double-layer water jacket can be arranged in the flue of the hot-water boiler.
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