1、常压当承压使用
将常压热水锅炉直接和自来水或采暖系统密闭循环。也就是将锅炉本体上与大气相通的排汽管当做回水管使用，使锅炉本体始终处于满水承压状态。这种密闭循环方式有两种危害：第一是当炉水温度过高时，产生的蒸汽无法排泄出去，因而压力会不断上升，爆炸和泄漏事故随时都有可能发生。第二是即使炉水温度不高，不会产生大量蒸汽，但由于有循环泵的作用，锅炉本体承受热水循环压力是较高的。
The direct and water pressure hot water boiler or heating system closed loop. That is, the upper body and the atmosphere of the boiler exhaust pipe as a return pipe used to make the boiler body is always in a state full of water pressure. There are two ways this closed loop hazards: The first is when the furnace when the water temperature is too high, the steam produced can not be excreted,so the pressure will continue to rise, explosions and spills can happen at any time. The second is that even if the boiler water temperature is not high, does not produce a lot of steam, but the effect of a circulation pump, the boiler body is subjected to high pressure hot water circulation.
2、质量差，发展缓慢
常压热水锅炉制造厂发展迅速，出现了产品供大于求的情况，有的生产厂家技术力量薄弱，制造质量差，且各厂家之间竞争非常激烈，相互压价，有的厂家甚至偷工减料。设计不规范。常压热水锅炉与承压锅炉相比，有显著的特点，特别是在热力和水动力方面，因此常压热水锅炉的结构设计应符合其自身的特点。但目前常压热水锅炉设计还不规范，设计时根本不进行热力计算和水动力计算，常压热水锅炉的设计基本上是在承压锅炉的基础上改为开口形式而已，其它结构原样复制，致使锅炉水循环不良，浪费能源。
Pressure hot water boiler factory has developed rapidly, product oversupply situation emerged, some manufacturers of technical weakness, poor manufacturing quality, and competition among manufacturers is fierce, lower prices, and even some manufacturers cut corners. Design is not standardized. Compared with pressure hot water boiler pressure boiler, a significant features,especially in the heat and water power, and therefore the structural design pressure hot water boiler should be consistent with its own characteristics. But the pressure hot water boiler design is still not standardized, do not be calculated thermodynamic calculation and hydrodynamic design, the pressure hot water boiler is basically designed to form the basis of the opening pressure of the boiler on it, other structures intact replication, resulting in poor circulation boilers, waste of energy.
3、安装混乱。近年来从事常压热水锅炉安装的队伍越来越多，安装队伍复杂，安装质量难于控制。锅炉房位置选择与施工也非常混乱，有的还未按《锅炉房设计规范》进行设计和施工。
Installation confusion. In recent years engaged in pressure hot water boiler installation team more and more complex installation team, difficult to control the quality of the installation. Select the location and construction of the boiler room is also very confusing, and some yet to press the "boiler room design specifications" for design and construction.
