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该文结合燃油常压热水炉的特点，通过分析计算，给出了其热效率的简易计算公式。该公式简单实用，特别适合现场测试估算用。
According to the characteristics of fuel oil-fired hot-water heater, a simple calculation formula of its thermal efficiency is given through the analysis and calculation. This formula is simple and practical, especially suitable for field test and estimation.