Can heavy metals ( lead, mercury, chromium, cadmium, arsenic, etc) be removed from water by boiling?

The answer is no and yes. No, because you cannot remove them just by boiling.

These metals accumulate when boiled. Yes, because you need to process the water further to remove these metals. One simple way, I could think of right now, is use of coagulants/flocculants on the boiled water (containing these metals). Metals bind to the coagulant/flocculants and you can remove them by sedimentation. Based upon my experience, it should work. You need to find out the optimum conditions to do it effectively. As per my understanding, this is the simplest method. But, its not practicable to use it because in boiling water needs huge energy and the method may not be energy efficient on field/large scale. But, if the water is coming from the industrial processes then it could be applicable/economical. There are many other methods too.

Boiling + another process/processes = water free of heavy metals

Removing heavy metal from water can be done by boiling followed by condensation. Boiling water alone is unable to produce water, unless you have additional process to condense the water vapor.

Heavy metals like Pb, Cr,As, Hg and Cd and others can never be removed by simple boiling of water. For the removal / reducing the heavy metals from water is a complex process. There is no common process for reducing / removing the heavy metals. Each such elements have individual and different technology for reducing/removing. Concentration level of heavy elements is also have great significance in selecting the methodology.

cannot depend on boiling only..maybe for heavy metals like Cd, Pb, Cr, condensation might helps but for mercury, neutralization should be done first..tq

We use different sorbents and ion exchangers to remove some of the metals in the list.

One needs to consider their concentrations (and those of the competing ions) as well as other characteristics of the treated stream.

The boiling of water is ineffective in removing heavy metals

Good question ...

Numerous effective and low adsorbents such as natural zeolites, biosorbents, charcoal and fly ash can be used for the heavy metal removal. According to my knowledge, only boiling will not work for the same.

i think you can't do it just by boiling