异径管采用异径密排技术的热水器，不论春夏秋冬四季如何变化，即使在阴、雨、雪的天气中，也因其率而具有的先热达到洗浴温度的特点。偏心异径管由于一侧是平的，利于排气或者排液，方便开车和检修，因此水平安装的液体管道一般用偏心异径管。同时，节能减排效果为显著，采用异径密排技术热水器整机光热效率可达73%左右，既节电、节煤，又减少二氧化碳排放量。
         偏心异径管的管口切点向上的时候，称为顶平安装，一般用于泵入口，利于排气，切点向下成为底平安装，一般用于调节阀的安装，利用排净。同心异径管有利于流体流动，在变径的时候对流体流态的干扰较小，因此气体和垂直流动的液体管道使用同心异径管变径。异径管的圆度不应大于相应端外径的1%，且允许偏差为±3mm；异径管尺寸允许偏差应符合表4.2.2-3的规定。
         可以根据自身工艺管道的实际流量对应上表中的流量来选择相应口径规格的流量计，尽可能选择与工艺管道相同口径规格的流量计。偏心异径管两端管口圆周内切，一般用于水平的液体管道。异径管也叫大小头，两端管口直径不同，用于连接不同直径的管子或法兰进行变径。同心异径管的两端管口，圆心在同一轴线上，变径的时候，以轴线计算管子位置的话，管子的位置不变，一般用于气体或垂直的液体管道变径。
Different-diameter pipe diameter by densely technology of water heater, no matter how chun xiaqiu winter seasons, even in the shade, rain, snow, but also because of the high efficiency and good bath temperature reached the first thermal characteristic. Eccentric different-diameter pipe due to one side is flat, drainage, convenient exhaust or drive and maintenance, so the general level of liquid pipe installation with eccentric different-diameter pipe. At the same time, the effect is more remarkable energy saving and emission reduction, and adopts different-diameter densely machine applies light-heat efficiency technology water heater, saving both reaches 73%, coal, and reduce carbon dioxide emissions.
Eccentric different-diameter pipe of the tangent, called up top flat installation, commonly used for pump suction, exhaust, for its downward becomes the commonly used for installation and adjustment of the installation, use valves. Concentric different-diameter pipe for fluid flow in size of fluid flow pattern of small, so the interference and vertical flow of liquid gas pipeline using concentric different-diameter pipe diameter changes. Different-diameter pipe of roundness should not exceed 1% of the corresponding diameter, and the allowable deviation of ± 3mm, Different-diameter pipe size deviation should be allowed to meet the prescribed 4.2.2 table 3 -.
According to their actual flow process piping to select the corresponding to the traffic flow, the corresponding diameter specifications as selection and piping specifications of the same diameter meter. Eccentric different-diameter pipe tube ends in circumference, commonly used for liquid level of pipeline. Different-diameter pipe size head, also called tube diameter at different, used to connect different diameter of pipe or flange diameter changes on. Concentric different-diameter pipe ends of the pipe axis, circle, at the same time, with the size and location of pipe axis calculation, the position of commonly used for gas or liquid pipe size of vertical.