Intensive combustion should be used in water heater. Heat convective surface is better than heat radiant surface for heat transfer in water heater.
在热水器上应采用强化燃烧方式，尽量采用对流受热面，减少辐射受热面。
When the heater is placed in the pot, kettle, etc. , it is placed in the focal spot, and the larger solar radiant energy density can be obtained.
把用热器放在锅、水壶等）放在焦斑处，就可以得到较大的太阳辐射能流密度，也就是说，在单位面积上可以得到较高的太阳辐射功率。
When the heater is placed in the pot, kettle, etc. , it is placed in the focal spot, and the larger solar radiant energy density can be obtained.
把用热器放在锅、水壶等）放在焦斑处，就可以得到较大的太阳辐射能流密度，也就是说，在单位面积上可以得到较高的太阳辐射功率。
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