"heating surface" meaning in English

{
  "forms": [
    {
      "form": "heating surfaces",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "heating surface (plural heating surfaces)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Norwegian Bokmål translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Norwegian Nynorsk translations",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1941 January, “Recent North American Locomotives”, in Railway Magazine, page 27:",
          "text": "[...] combined heating surface is 6,151 sq. ft. (tubes, 530 sq. ft., flues, 3,275 sq. ft., firebox, with arches and thermic syphons, 415 sq. ft., and superheater 1,931 sq. ft.); [...].",
          "type": "quote"
        }
      ],
      "glosses": [
        "In a steam boiler, the aggregate surface exposed to fire or to the heated products of combustion, especially of all the plates or sheets that are exposed to water on their opposite surfaces."
      ],
      "id": "en-heating_surface-en-noun-09gxulEs",
      "links": [
        [
          "steam boiler",
          "steam boiler"
        ],
        [
          "aggregate",
          "aggregate"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "fire",
          "fire"
        ],
        [
          "combustion",
          "combustion"
        ],
        [
          "plate",
          "plate"
        ],
        [
          "sheet",
          "sheet"
        ],
        [
          "water",
          "water"
        ]
      ],
      "synonyms": [
        {
          "word": "fire surface"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "surface exposed to fire in a boiler",
          "word": "tulipinta"
        },
        {
          "code": "nb",
          "lang": "Norwegian Bokmål",
          "sense": "surface exposed to fire in a boiler",
          "tags": [
            "feminine",
            "masculine"
          ],
          "word": "heteflate"
        },
        {
          "code": "nn",
          "lang": "Norwegian Nynorsk",
          "sense": "surface exposed to fire in a boiler",
          "tags": [
            "feminine"
          ],
          "word": "heteflate"
        }
      ]
    }
  ],
  "word": "heating surface"
}

{
  "forms": [
    {
      "form": "heating surfaces",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "heating surface (plural heating surfaces)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with Norwegian Bokmål translations",
        "Terms with Norwegian Nynorsk translations"
      ],
      "examples": [
        {
          "ref": "1941 January, “Recent North American Locomotives”, in Railway Magazine, page 27:",
          "text": "[...] combined heating surface is 6,151 sq. ft. (tubes, 530 sq. ft., flues, 3,275 sq. ft., firebox, with arches and thermic syphons, 415 sq. ft., and superheater 1,931 sq. ft.); [...].",
          "type": "quote"
        }
      ],
      "glosses": [
        "In a steam boiler, the aggregate surface exposed to fire or to the heated products of combustion, especially of all the plates or sheets that are exposed to water on their opposite surfaces."
      ],
      "links": [
        [
          "steam boiler",
          "steam boiler"
        ],
        [
          "aggregate",
          "aggregate"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "fire",
          "fire"
        ],
        [
          "combustion",
          "combustion"
        ],
        [
          "plate",
          "plate"
        ],
        [
          "sheet",
          "sheet"
        ],
        [
          "water",
          "water"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "fire surface"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "surface exposed to fire in a boiler",
      "word": "tulipinta"
    },
    {
      "code": "nb",
      "lang": "Norwegian Bokmål",
      "sense": "surface exposed to fire in a boiler",
      "tags": [
        "feminine",
        "masculine"
      ],
      "word": "heteflate"
    },
    {
      "code": "nn",
      "lang": "Norwegian Nynorsk",
      "sense": "surface exposed to fire in a boiler",
      "tags": [
        "feminine"
      ],
      "word": "heteflate"
    }
  ],
  "word": "heating surface"
}