The energy efficiency of a water heater is measured in energy Factor or (ef). The larger the number of ef, the more efficient the water heater is.
热水器能效由能量因数或(EF)来测定，EF值越大，热水器的能效就越高。
For even greater efficiency consider buying a tankless water heater. Tankless water heaters only heat water when it is needed, instead of keeping a reserve of water at a constant temperature.
购买无水箱热水器（电热水器）是更加节能的做法，电热水器只在需要的时候对水进行加热，而不会对保存在水箱内的水加热保温。
This paper introduces a new type of solar water-heater, which works with direct-circulate compounded form. It can raise heat efficiency.
介绍了一种全新的太阳能热水器，采用直流—循环复合工作方式，提高了效率。
In view of the limitation of safety and efficiency of current water-heater, the basic structure and principle of a supersonic-frequency induction water-heater are introduced.
针对目前热水器的安全，效率等局限性，本文介绍了一种超音频感应加热热水器的基本结构和原理。
The thermal balance and thermal efficiency of domestic gas water heater are analyzed.
对家用燃气热水器的热平衡及热效率进行分析。
Heater exchanger efficiency of air preheater was important influence of heat efficiency on the boiler.
空气预热器的热交换效率对整个锅炉的热效率影响很大。
Operating under variable conditions will affect the efficiency of the crude oil heater seriously.
原油加热炉在变工况下运行会严重降低效率。
The influence of the working fluid pressure and the structure of ejecting nozzle on the outlet temperature, ejecting coefficient and heating efficiency of the ejecting-mixing heater were analyzed.
对多喷嘴引射混合式加热器的加热性能进行了试验研究，分析了工作流体压力和引射孔结构对引射混合式加热器的出口温度、引射系数以及加热效率的影响。
Instantaneous efficiency and daily average efficiency of evacuated tubular solar heater waters are contrasted with theoretical values by model of calculation and experimental data.
利用模型计算值和实验值对真空管式太阳热水器的瞬时效率、日平均效率进行了比较分析，结果表明所建立的计算模型总体上是成功的。
At the same pressure and distance, the overheating degree formed by the heater from Shenzhen on mushroom surface was the largest and the dehydrating efficiency was the highest.
在相同压力、距离条件下，深圳管形成的香菇表面过热度大，去水效能高。
Meanwhile, it can also effectively reduce self inductance effect of the micro-heater and improve the heating efficiency.
同时该结构还能有效减小微加热器本身的自感效应，提高加热效率。
The key for increasing exergy efficiency of heat medium heater is to reduce the lost of exergy during combustion and heat transfer period.
提高热媒炉(火用)效率的关键是降低燃烧过程和传热过程的炯损失。
Based on practical situations, the article introduces the influence of different type fan to gas instantaneous water heater combustion thermal efficiency when heat load changes.
文章从实际情况出发，介绍了燃气快速热水器在热负荷变化时使用不同类型的风机对燃烧热效率的影响。
The study result shows that the condensing gas water heater is characterized by high efficiency, energy saving and environmental protection.
研究结果表明这种冷凝式燃气热水器具有高效、节能和环保的特点。
The influence of cold water temperature and anticorrosive coating on the thermal efficiency of water heater is studied.
研究了冷水温度和防腐涂层对热水器热效率的影响。
Experimental analysis and study of the flue gas condensation unit is set or not on the catalytic combustion heater thermal efficiency.
通过实验分析和研究了烟气冷凝装置设置与否对催化燃烧热水炉热效率的影响。
The time constant and instantaneous efficiency of the feed-tube solar air heater were tested on the solar irradiance. The equation for instantaneous efficiency was obtained at the different flow rate.
在自然辐照条件下测试了内插管式空气集热器的时间常数、瞬态效率，得到了不同流量下的瞬态效率方程。
The condensing water heater has a considerable energy-saving potential, and reducing the flue gas temperature can effectively enhance the thermal efficiency of gas water heater.
冷凝式热水器具有相当大的节能潜力，降低排烟温度可有效提高热水器热效率。
The heater body is designed with a atmospheric pressure structure, which adopts superheat pipes and corrugated pipes to improve greatly its heat efficiency.
这种加热炉的技术关键在于筒体按常压结构设计，采用了超导热管和波纹管强化传热材料，大幅度提高了热效率。
It is also verified from practical application that this novel vapour heater can decrease both the vibration and the noise during operation, and increase the heat exchange efficiency effectively.
经现场使用证明，这种新型的蒸汽加热器能更有效地达到降噪，减振和提高热效率的效果。
The results show that the boiler efficiency increased 1.24% and the flue gas loss reduced 1.41% after installed the heat pipe air heater.
结果表明，该炉加装前置式热管预热器后，排烟损失降低1.41%，锅炉效率提高1.24%。
The solar energy-assisting electric heater is reasonable in structure, stable in heating control, long in service life and high in work efficiency.
本实用新 型结构合理，加热控制稳定，使用寿命长，工作效率高。
The experimental results shows that the new type of gas heater with condensation has high efficiency and can save energy.
研究结果表明新型冷凝式燃气热水器具有高效，节能和环保的特点。
The experimental results shows that the new type of condensation gas-fired water heater has high efficiency and can save energy.
研究结果表明新型冷凝式燃气热水器具有高效，节能和环保的显著特点。
The phase-change thermal storage type water tank of the heat pump water heater has the advantages of high heat transfer efficiency and large thermal storage density.
本发明的相变储热式热泵热水器水箱具有传热效率高、储热密度大的优点。
With the increase of the gas pressure and temperature, the thermal efficiency of water heater becomes higher.
随着燃气压力的增加，燃烧温度升高，热水器的热效率变大。
Thermal efficiency is an important parameter for the design of vacuum tube solar heater.
设计真空管太阳能热水器时的重要参数。
The three-way construction of the heater unit guarantees high thermal efficiency.
加热器有三个通道，这种造型保证了良好的热效应。
The machine uses special heater and electronic auto-controller which can minimize the temperature difference and rise to a high efficiency;
采用特殊加热器及电子自动控制器，此控制器可减少温度差距使效率提升；
The machine uses special heater and electronic auto-controller which can minimize the temperature difference and rise to a high efficiency;
采用特殊加热器及电子自动控制器，此控制器可减少温度差距使效率提升；
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