Boiler Blow-Off Evaporators can evaporate large volumes (2 – 4 gpm) at a low cost and are effective on pretreated waste streams. This is no method for collecting or removing suspended solids. Most of the dissolved solids are vaporized in the steam at 212°F and blown off into the atmosphere. VOCs will be vaporized and will create air pollution. Therefore, all VOCs and solids must be removed from this system. Efficiency is 70% – 85%.