FIELD: thermal engineering; heating dwelling houses and industrial buildings; hot water supply. SUBSTANCE: multiple-plate electrodes of electric heater mounted in a spaced relation to heater walls and dipped into medium to be heated are made of different materials, that is, of stainless steel and titanium alloy, and mounted one after another; heating medium is aqueous solution of salts with preset proportion of components. EFFECT: enhanced heating efficiency due to reduced specific quantity of electricity; eliminated gassing on electrode surfaces during heating process. 1 dwg, 1 tbl
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