A steam separator for a boiler includes an upper support rail assembly and an integrated baffle unit. Rail assembly clips can be secured to the upper support rail assembly for retaining an edge of one or more baffle panels. The integrated baffle unit can include a bottom tray assembly with a bottom baffle panel and one or more side baffle panels. The side baffle panels can be maintained within a bottom tray clip and/or a rail assembly clip.

A boiler includes a vessel having vertically-extensive walls defining multiple vertically-extensive channels. The vessel includes a liquid supply connection communicating with liquid inlets adjacent a lower end of each of the channels and a vapor discharge communicating with liquid outlets adjacent the upper end of each of the channels. The boiler also includes a set of electrodes positioned within the channels, with some of the electrodes in each channel being located at different elevations. An electrical power supply of the boiler has at least two poles and is operable to supply different electrical potentials to the different poles. A circuit is operable to selectively connect the electrodes to and selectively disconnect electrodes from the poles in multiple different connection schemes, each of which involves electrical current flowing between the connected electrodes along a current path through liquid in at least one of the channels.