Unverified80% confidenceFactTime unknown
带电加热功能的'电热饭盒'实际是通过底部加热盘蒸/煮，加热需接220V电源约20-30分钟，且注水加热的通常无法长时间保温，与真空保温饭盒是两类产品
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80%
Confidence
Long-term
Relevance
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Unverified电热饭盒不等于保温饭盒，多数机型断电后无真空保温层，保温时长有限（通常1-2小时明显降温）；如需长时间保温应额外看是否有真空结构，否则依赖到点加热而非保温86% similarUnverified多数户外电热水壶不具备真空保温层，烧开后30分钟即降至60℃以下；如需保温应单独配保温杯，不要指望电热壶兼顾保温80% similarUnverified焖烧壶型（真空双层不锈钢+密封盖）实测6-8小时保温可达50℃以上，普通带饭盒式保温桶多在3-4小时降至常温，长时间保温需求应选焖烧壶结构而非饭盒结构79% similarUnverified'恒温壶'与'保温壶'是两回事：恒温壶需持续通电主动加热维持温度，纯保温壶靠真空层被动保温6-8小时但温度只降不升，长途出行无电源场景反而保温壶更实用79% similarUnverified带电热一体功能的泡面锅（内置发热盘）省去炉具且带自动保温，适合无炉具的租房/办公场景；但其功率通常600-800W，煮沸时间比燃气灶长，且不能干烧78% similar
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