• 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.

    本实用新型烟道可以设置双层相通的二次加热

    youdao

  • 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.

    本实用新型烟道可以设置双层相通的二次加热

    youdao

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