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This paper discusses observations on electric steam and hot-water boilers. The increased popularity of both steam and hot water generation by electricity is readily apparent. The advantages of this type of heat generation lend themselves to many current applications in the heating, ventilating, and air conditioning field. Sizes of boilers have been increasing through the years, with no apparent end in sight due to the accelerated development of the electrode boiler, which will be covered in detail in the second part of the paper. As compared to the resistance type of boiler, this latter design permits economical projection into much larger boiler sizes. Electric boiler installation is relatively simple since there is no concern with chimneys or fuel storage. Often the boiler room can be eliminated and the mechanical equipment room serve as the required space. Electric boiler operation can be automated to the point where an operator is virtually unnecessary with the many control options available today. Integration of the boiler into heat recovery and solar energy systems has also accelerated the growth of this product. As might be expected, due to the simplicity of boiler construction and accessories, electric boiler maintenance is at a minimum. However, certain areas of additional control must be exercised since unique problems can develop with electric steam and hot water generation. The paper is illustrated with pictures of actual installations and case histories covering the gamut of specification, installation, and successful operation.